Arthur James Downer

Environmental Horticulture/Plant Pathology Advisor Emeritus

Cooperative Extension Ventura County
669 County Square Drive, #100
Ventura, CA 93003-5401
(805) 645-1458
ajdowner@ucanr.edu

http://ceventura.ucanr.edu

Biography

BSc Cal Poly, Pomona 1981 Botany/Ornamental Horticulture
MSc Cal Poly, Pomona, 1983 Biology/Plant Pathology
Ph.D. Univ. California Riverside, 1998 Plant Pathology.
CE Advisor in Environmental Horticulture in Ventura County since 1985
Adjunct Plant Science Professor, California Polytechnic U. in Pomona since 2013

Education

Ph.D. Plant Pathology, UC Riverside. 1998

Discipline

Plant Pathology

Specialty

Pathology of landscape ornamentals , Phytophthora Root Rot, Mulches, Potting soils, Palm horticulture, climate ready trees, arboriculture, Master Gardener Advisor.

Areas of Expertise (click to see all ANR academics with this expertise)

Bibliography

Peer Reviewed

Downer, A. J. D. Vega and T. Michailides (2022). Botryosphaeria Canker. Agriculture and Natural Resources. 74177. July, 19.
Chalker-Scott, Linda; Downer, Arthur James (2022). Garden Myth-Busting for Extension Educators: The Science Behind the Use of Arborist Wood Chips as Landscape Mulches. JOURNAL OF THE NACAA. 15:2. December. https://www.nacaa.com/file.ashx?id=6c7d4542-7481-4f0a-9508-d8263a437348
Downer, A. J.; Faber, B. (2021). Amending Landscape Soils. UCANR. 8711.
Chalker-Scott, L; Downer, A.J. (2021). Myth Busting for Extension Educators: Reviewing the Literature on Pruning Woody Plants. Journal of NACAA. 14:2, 1-12. December 6.
Downer, A.J. and S. Swain and A. Crump (2020). Anthrcnose, UCIPM Pest Notes, Publiction # 7420.
Fescenko, A.; Downer, J. A.; Fescenko, I (2020). Persistence of remnant boreal plants in the Chiricahua Mountains, Southern Arizona. Global Ecology and Conservation. Elsevier. 23, 1-10.
Chalker-Scott, L.:Downer J.A. (2020). Soil Myth Busting for Extension Educators: Reviewing the Literature on Soil Nutrition. National Association of County Agricultural Agents. 13:2. https://www.nacaa.com/journal/index.php?jid=1134&fbclid=IwAR0cPfBl3V-3car-RPeEmlqzwW8bPEOPgND07xMTNgCOa5GkuSWtdD5WzF8
Downer, A.J.; Karlik, J.F. (2019). A Comparison of Two Horsechestnut Street Tree Plantings in Kiev and Pripyat, Ukraine. Open J. Forestry. 9, 255-263.
Downer, A.J. and I. Lacan (2019). Armillaria UC IPM Pest Notes UCANR #74171. UCANR.
Karlik, J.F.; Downer, A.J. (2019). Comparison of Gamma Ray Dosimeters in a Field Study in the Chernobyl Exclusion Zone. J. of Air and Waste Man. 11, 1361-1367.
Takeuchi, T.; Downer, A.J. (2019). Lead absorption by radish is affected by soil texture and cultivar. Open J. Soil Science. 9:4, 65-74.
Downer, A.J.; Faber, B. (2019). Mulches for landscapes. ANR publication #8672.
Downer, A.J.; Faber, B. (2019). Non-chemical prevention of Armillaria mellea infection of Peach (Prunus persica). Plant Sci. and Phytopathology. 3, 50-55.
Downer, A.J.; Perry, E.J. (2019). Wood Decay Fungi in the landscape. ANR publication #74109.
Chalker-Scott, L; Downer, J (2018). Garden myth busting for Extension Educators: Reviewing the Literature on Landscape Trees. J. of the National Assn. Ag. Agents. 11:2. https://www.nacaa.com/journal/index.php?jid=885&fbclid=IwAR3fS2iKo8ibifQEDPUrG6UlcB8n-yUgOe6xx1y56MeAcLhP6ZoUkQbUQNg
Downer, J. (2016). Native Diseases of California Mediterranean Forest Angiosperms.T. Paine and F. Lieutier. Springer. 529-547.
Neila, S.; Akef, S.; Bouzaiane, O.; Kallali, H.; Aissa, N. Ben; M’Hiri, F.; Downer., N. Jedidi and J. (2015). Carbon and nitrogen mineralization in clay loam soil amended with different composts. Advances in Applied Ag. Science 03:20-34. Advances in Applied Ag. Science. 03, 20-34.
Downer, A.; Howell, A.; Karlik, J. (2014). "Effect of pruning on eight landscape rose varieties." Acta Horticulturae
Downer, A.; Hodel, D.; Matthews, D.; Pittenger, D. (2013). "Effect of fertilizer nitrogen source on susceptibility of five species of field grown palms to Fusarium oxysporum f. sp. carnariensis." Palms 57: 89-92.
Hodel, D.; Downer, A.; Pittenger, D. (2013). "Effect of leaf removal and tie-up on date palms transplanted in extremely hot, arid conditions." Palms 57: 72-78.
Hodel, D.; Downer, A.; Pittenger, D. (2013). "Effect of leaf removal and tie-up on water loss and estimated crop coefficients for juvenile trunkless containerized queen palms." Palms 57: 79-83.
Downer, A.; Hodel, D.; Pittenger, D. (2013). "Effect of leaf tie-up and pre-plant storage on growth and transpiration of transplanted Mexican fan palms." Palms 57: 58-63.
Hodel, D.; Downer, A.; Pittenger, D. (2013). "Effect of sand backfill on transplanted king, queen, and windmill palms." Palms 57: 63-66.
Bennett, P.; Bauske, E.; O'Connor, A.; Reeder, J.; Baush, C.; Kratsch, H.; Leger, E.; Callaghan, A.; Nitzsche, P.; Downer, A. (2013). "Farmers' Market, Demonstration Gardens, and Research Projects Expand Outreach of Extension Master Gardeners." HortTechnology 23: 411-415.
Downer, A.; Hodel, D. (2013). "Suitability of ground palm trunk tissues as a medium for growing potted plants." Palms 57: 67-71.
Khiari, L.; Neila, S.; Kouki, S.; Rejeb, A.; M'hiri, F.; Hajilaoui, M.; Fumio, M.; Hassen, A.; Jedidi, N.; Downer, A.J.; Ouzari, H. (2012) Control of Fusarium wilt of tomato caused by Fusarium oxysporum f.sp. lycoperscici using mixture of vegetable and Posidonia oceanica compost. Applied and Environmental Soil Science 11 DOI: 10.1155/2012/239639
Hodel, D.; Downer, A.; Pittenger, D. (2012). "Effect of container type on the nursery growth of kentia palms and king palms." Palms 56: 65-71.
Mayorquin, J.; Eskalen, A.; Downer, A.; Hodel, D.; Liu, A. (2012). "First report of multiple species of the botryosphaeriaceae causing bot canker disease of Indian laurel leaf fig in California." Plant Disease 96(3): 459.
Corkidi, L.; Merhaut, D.; Allen, E.; Downer, A.; Bohn, J.; Evans, M. (2011). "Effects of Mycorrhizal colonization on nitrogen and phosphorus leaching from nursery containers." HortScience 46: 1472-1479.
Pittenger, D.; Downer, A.; Hodel, D.; Mochizuki, M. (2009). "Estimating water needs of landscape palms in Mediterranean climates." HortTechnology 19: 700-704.
Downer, A.; Uchida, J.; Elliot, M.; Hodel, D. (2009). "Lethal palm diseases common in the United States." HortTechnology 19: 710-716.
Hodel, D.; Downer, A.; Mochizuki, M. (2009). "Pruning Landscape Palms." HortTechnology 19: 695-699.
Downer, A.; Hodel, D.; Mochizuki, M. (2009). "Pruning Landscape Palms." HortTechnology 19: 695-699.
Hodel, D.; Downer, A.; Pittenger, D. (2009). "Transplanting Palms." HortTechnology 19: 686-689.
Downer, A.; Crohn, D.; Faber, B.; Daugovish, O.; Becker, J.; Menge, J.; Mochizuki, M. (2008). "Survival of plant pathogens in static piles of ground green waste." Phytopathology 98: 574-554.
Faber, B.; Downer, A.; Holstege, D.; Mochizuki, M. (2007). "Accuracy varies for commercially-available soil test kits analyzing nitrate nitrogen, phosphorus, potassium and pH." HortTechnology 17: 358-362.
Crohn, D.; Faber, B.; Downer, A.; Daugovish, O. (2007). "Probabilities for survival of glassy-winged sharpshooter and olive fruit fly pests in urban yard waste piles." Bioresource Technology 99: 1425-1432.
Hodel, D.; Downer, A.; Pittenger, D. (2006). "Effect of leaf removal and tie-up on transplanted large Mexican fan palms (Washingtonia robusta)." Palms 50: 76-81.
Hodel, D.; Downer, A.; Pittenger, D. (2006). "Effect of leaf removal and tie-up on transplanted large Mexican fan palms (Washingtonia robusta)." Palms 50: 76-81.
Koike, S.; Daugovish, O.; Downer, A. (2006). "Sclerotinia stem and crown rot of celery, caused by Sclerotinia minor, in California." Plant Disease 90: 829.
Hodel, D.; Downer, A.; Pittenger, D.; Beaudoin, P. (2006). "The effect of amended backfill soils when planting five species of palms." HortTechnology 16: 457-460.
Daugovish, O.; Downer, A.; Faber, B.; McGiffen, M. (2006). "Weed survival in yardwaste mulch." Weed Technology 21: 59-65.
Downer, A.; Faber, B. (2005). "Effect of Eucalyptus cladocalyx mulch on establishment of California sycamore (Platanus racemosa)." Journal of Applied Horticulture 7: 90-94.
Corkidi, L.; Allen, E.; Merhaut, D.; Allen, M.; Downer, A.; Bohn, J.; Evans, M. (2005). "Effectiveness of four commercial mycorrhizal inoculants on the growth of Liquidambar styraciflua in plant nursery conditions." Journal of Environmental Horticulture 23: 72-76.
Dahlsten, D.; Dane, K.; Paine, T.; Sime, K.; Lawson, A.; Rowney, D.; Roltsch, W.; Andrews, J.; Kabashima, J.; Shaw, D.; Robb, K.; Geisel, P.; Chaney, W.; Ingels, C.; Bianchi, M.; Varela, L.; Downer, A.; Haviland, D.; Talor, G.; Keller, M. (2005). "Imported parasitoid helps control red gum lerp psyllid." California Agriculture 59: 229-234.
Hodel, D.; Pittenger, D.; Downer, A. (2005). "Palm root regeneration and implications for transplanting." Journal of Arboriculture 31: 171-181.
Pittenger, D.; Hodel, D.; Downer, A. (2005). "Transplanting specimen palms: a review of common practices and research-based information." HortTechnology 15: 128-132.
Corkidi, L.; Allen, E.; Merhaut, D.; Allen, M.; Downer, A.; Bohn, J.; Evans, M. (2004). "Assessing the infectivity of commercial mycorrhizal inoculants in plant nursery conditions." Journal of Environmental Horticulture 22: 149-154.
Daugovish, O.; Downer, A.; Becker, O.; Browne, G.; Duniway, J. (2004). "Mustard-derived biofumigation for vegetable crops and strawberries." Agroindustria 3: 5-8.
Valenzuela-Solano, C.; Crohn, D.; Downer, A. (2004). "Nitrogen mineralization from eucalyptus yard waste mulch applied to young avocado trees." Biology and Fertility of Soils 41: 38-45.
Hodel, D.; Pittenger, D.; Downer, A. (2003). "Effect of Leaf removal and tie up on juvenile transplanted canary island date palms (Phoenix canariensis) and queen palms (Syagrus romanzoffiana)." Palms 47: 177-184.
Downer, A.; Craigmill, A.; Holstege, D. (2003). "Toxic potential of oleander derived compost and vegetables grown with oleander soil amendments." Journal of Human and Veterinary Toxicology 45: 219-221.
Downer, A.; Faber, B.; Menge, J. (2002). "Factors affecting root rot control in mulched avocado orchards." HortTechnology 12: 601-605.
Dagit, R.; Downer, A. (2002). To prune or not to prune: recovery of Coast Live Oak after transplanting. 5th Oak Symposium (Proceedings), San Diego, CA, USDA Forest Service.
Downer, A.; Menge, J.; Pond, E. (2001). "Association of cellulytic enzyme activities in eucalyptus mulches with biological control of Phytophthora cinnamomi Rands." Phytopathology 91: 847-855.
Faber, B.; Downer, A.; Menge, J. (2001). "Differential effects of mulch on citrus and avocado." Acta Horticulturae 557: 303-307.
Downer, A.; Menge, J.; Pond, E. (2001). "Effects of cellulytic enzymes on Phytophthora cinnamomi Rands." Phytopathology 91: 839-846.
Downer, A.; Hodel, D. (2001). "The effect of mulching and turfgrass on growth and establishment of Syagrus romanzoffiana (Cham.) Becc., Washingtonia robusta H.Wendl. and Archontophoenix cunninhamiana (H.Wendl.)H. Wendl. & Drude in the landscape." Scientia Horticulturae 87: 85-92.
Dagit, R.; Downer, A. (1999). "Transplanted coast live oaks (Quercus agrifolia) in southern California." Journal of the International Oak Society 9: 145-150.
Downer, A. (1998). The effects of mulch on Phytophthora cinnamomi and Avocado Root Rot. Ph.D. Dissertation. University of California, Riverside, CA. 212.
Dagit, R.; Downer, A. (1997). Status of transplanted coast live oaks in Southern California. Symposium on Oak Woodlands: Ecology, Management and Urban Interface Issues (Proceedings), San Luis Obispo, CA, Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture.
Dagit, R.; Downer, A. (1996). Status of transplanted coast live oaks in Southern California. Symposium on Oak Woodlands: Ecology, Management and Urban Interface Issues (Proceedings), San Luis Obispo, CA, Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture.
Cudney, D.; Downer, A.; Gibeault, V.; Reints, J. (1995). "A non-disruptive technique for kikuyugrass control in cool season turf." California Agriculture 48: 24-28.
McGiffen Jr., M.; Greene, R.; Manthey, J.; Faber, B.; Downer, A.; Sakovich, N.; Aguilar, J. (1995). "Field tests of methanol as a crop yield enhancer." HortScience 30: 1225-1228.
Faber, B.; Downer, A.; Yates, L. (1993). "Inexpensive, hand-held moisture meters." HortTechnology 3: 195-196.
Cudney, D.; Downer, A.; Gibeault, V.; Henry, J.; Reints, J. (1993). "Kikuyugrass (Pennisetum clandestinum) management in turf." Weed Technology 7: 180-184.
Bellows, T.; Paine, T.; Gould, J.; Bentley, W.; Coviello, R.; Downer, A.; Elam, P.; Flaherty, D.; Goevca, P.; Koehler, C.; Molinar, R.; Perry, E.; Voegel, G. (1992). "Biological control of ash whitefly: a success in progress." California Agriculture 46: 27-28.
Downer, A.; Koehler, C.; Paine, T. (1991). "Biology and management of the eugenia psyllid (Trioza eugeniae Froggatt)." Journal of Environmental Horticulture 9(3): 137-141.
Downer, A.; Cudney, W. (1989). "Glyphosate doesn't harm tall fescue." California Agriculture 43: 13-14.
Armentrout, V.; Downer, A.; Grasmick, L.; Weinhold, A. (1987). "Factors affecting infection cushion development by Rhizoctonia solani on cotton." Phytopathology 77: 623-630.
Armentrout, V.; Downer, A. (1987). "Infection cushion development by Rhizoctonia solani on cotton." Phytopathology 77: 619-623.
Downer, A.; Koehler, C.; Svihra, P.; Molinar, R. (1987). "New psyllid pest of California pepper tree." California Agriculture 42: 30-32.
Armentrout, V.; Downer, A.; Nameth, S. (1986). "A simplified branching assay for Rhizoctonia solani." Mycologia 78: 657-663.

Non-Peer Reviewed

Downer, J. 2022. House Plant Basics. January 14, 2022. https://gardenprofessors.com/wp-admin/post.php?post=12091&action=edit
Downer, J. 2021. Pruning Paints Debunked. The Garden Professors. Jan. 08, 2021. http://gardenprofessors.com/wp-admin/post.php?post=11029&action=edit
Downer, A. J. (2021).
Downer, J. 2021. Why Fresh is Best—when it comes to mulch? The Garden Professors. Feb. 04 2021. http://gardenprofessors.com/why-fresh-is-best-when-it-comes-to-mulch/
Downer J. 2021. The Contrarian Rosarian—Debunking Rose Mythology. The Garden Professors Mar 05, 2021 …https://gardenprofessors.com/wp-admin/post.php?post=11136&action=edit.
Downer, J. 2021. My Soil is Crap. The Garden Professors. April 09, 2021. https://gardenprofessors.com/my-soil-is-crap/
Downer, J. 2021. My Soil is Crap—Part II. May 05, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11305&action=edit
Downer, J. 2021. Is your landscape sustainable? June 11, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11388&action=edit
Downer, J. 2021. Diagnosing Abiotic Disorders I. July 10, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11454&action=edit
Downer, J. 2021. Diagnosing Abiotic Disorders II. August 08, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11435&action=edit
Downer, J. 2021. Pruning Basics. September 09, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11668&action=edit
Downer, J. 2021. Pruning Newly Planted Trees. October 9, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11741&action=edit
Downer, J. 2021. Pruning Established Trees. November 6, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11813&action=edit
Downer, J. 2021. Pruning Mature Trees. December 11, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11934&action=edit
Downer, A. J. (2021). Abiotic Disorders of Trees. Tree Care Industry Association. 33:1, 38-40.
Chalker-Scott, L; Downer, J. (2021). Garden myth busting for extension educators: reviewing the literature on landscape trees. Western Arborist. 46:4, 55-63.
Downer, A.J. (2021). Mulching. Hawaii Landscape. 24-29. Jan-feb.
Downer, A.J.; Hagen, B.; Chalker-Scott, L. (2020). Botany for Arborists:Tree Sex. Western Arborist. Western Chapter International Society of Arboriculture. 45:3, 22-24.
E.G., McPherson; Berry, A.M.; van Doorn, N.S; Downer, J.; Hartin, J.; Haver, D.; Teach., E. (2020). Climate-Ready Tree Study: Update for Southern California Communities. 45, 12-18.
Downer, A. J. (2020). Fall is for Fungal Fruit. The Garden Professors. October 23, 2020.
Ritter, M; Downer, J. (2020). Plant taxonomy and changing tree names. Western Arborist. 46:3, 56-61.
Downer, J. 2020. The worms crawl in and the worms crawl out, but these worms kill your plants. The Garden Professors. Posted Nov. 30, 2020. http://gardenprofessors.com/wp-admin/post.php?post=10975&action=edit
Downer, J. (2019). Botany for Arborists: Stems. Western Arborist. Western Chapter International Society of Arboriculture. 45:1, 52-60.
Smith, K.; Downer, J. (2019). Botany For Arborists:Energy. Western Arborist. Western Chapter International Society of Arboriculture. 45:3, 28-32.
Downer, J.; Hagen, B.W. (2019). Botany for Arborists:Leaves. Western Arborist. Western Chapter International Society of Arboriculture. 45:2, 54-60.
Downer, J. (2018). Botany for Arborists: Environmental Stress Heat Injury. Western Arborist. 44:3, 16-20.
Downer, J. (2018). Dr. James Downer on sabbatical:Parting thoughts on the drought. Western Arborist. 44:4, 50-51.
Downer, J. (2018). Pruning climate ready trees. Western Arborist. 44:1, 50-52.
Downer, J. (2018). Pruning climate ready trees. Western Arborist. 44:1, 50-52.
Downer, J. (2018). The “Rendezvous” an enhanced outdoor education experience. Western Arborist. 44:2, 18-19.
Downer, J. (2017). Bot worsens as drought continues. Ventura County Farm Bureau Newsletter. 69:4, 2.
McPherson, E.G. (2017). Climate-ready tree study—Update for Central Valley communities. Western Arborist. 42:4, 44-51.
Downer, J. (2017). Pruning: some basic concepts. Western Arborist. 42:4, 36-44.
Downer, J. (2016). Trees in the Chernobyl Nuclear Exclusion Zone. Western Arborist. 42:1, 42-45.
Downer, J. (2015). Botany for arborists: Growth in trees. Western Arborist. 41:4, 56-63.
Downer, J. (2015). Botany for arborists: Mulching demystified. Western Arborist. 41:3, 50-54.
Downer, A. (2014). "Botany for arborists - Shade trees diseases: A quick overview." Western Arborist 40(1): 34-37.
Downer, A. (2014). "Botany for arborists: Canker diseases." Western Arborist 40(3): x-x.
Downer, J. (2014). Botany for arborists: Canker diseases. Western Arborist. 40:3, 56-62.
Downer, A. (2014). "Botany for arborists: Plant hormones -- How plants and trees regulate their growth." Western Arborist 40(2): 18-19.
Downer, J. (2014). Botany for arborists: Plant hormones—How plants and trees regulate their growth. Western Arborist. 40:2, 18-19.
Downer, A. (2014). "Botany for arborists: Root rot diseases of trees." Western Arborist 40(4): 56-63.
Downer, J. (2014). Botany for arborists: Root rot diseases of trees. Western Arborist. 40:4, 55-63.
Downer, A. (2014). Cool weather diseases of nursery crops. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:3. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Fall_2014__Cool_weather_diseases_of_nursery_crops/
Downer, A.; Escalen, A. (2014). Disease Focus: Fusarium dieback and the polyphagous shot hole borer. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:1. http://ucanr.edu/sites/UCNFAnews/Disease_Focus/Fusarium_dieback_and_PSHB
Downer, A. (2014). DISEASE FOCUS: Scorch diseases caused by Xylella fastidiosa. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:3. http://ucanr.edu/sites/UCNFAnews/Disease_Focus/Scorch_diseases/
Downer, A. (2014). "Drought and Tree Diseases." Southwest Trees and Turf 1: 10.
Downer, A. (2014). Drought exacerbates root rots. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:2. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Summer_2014__Drought_exacerbates_root_rots_691
Downer, A. (2014). Polyphagous shot hole borer look-alikes. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:1. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Spring_2014__PSHB_look-alikes
Downer, J. (2014). Presidents Perspective: Passion for Trees: Western Arborist. 40:4, 6.
Downer, A. (2013). A comparison of organic fertilizers. UCNFA (University of California Nursery and Floriculture Alliance) News. 17:3. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Fall_2013__A_comparison_of_organic_fertilizers
Downer, A. (2013). "Botany for arborists IX. Nutrient Management." Western Arborist 39: 42-46.
Downer, A. (2013). "Botany for arborists X. How to irrigate Trees." Western Arborist 39(4): 54-57.
Stone, H.; Downer, A. (2013). Caring for old native oaks. Technical Information Sheet 3. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFoakis2013.pdf
Stone, H.; Downer, A. (2013). Diagnosing and rectifying salt toxicity. Technical Information Sheet 8. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFsalinity2013.pdf
Downer, A. (2013). Disease focus: effect of fertilizers on plant diseases. UCNFA (University of California Nursery and Floriculture Alliance) News. 17:3. http://ucanr.edu/sites/UCNFAnews/Disease_Focus/DISEASE_FOCUS__Effect_of_fertilizers_on_plant_diseases
Downer, A.; Howell, A. (2013). "Effect of organic fertilizer on .." HortScience xx: xx.
Downer, A.; Howell, A.; Karlik, J. (2013). "Effect of pruning on eight landscape rose varieties." HortScience 48: XX.
Stone, H.; Downer, A. (2013). Improving soil conditions around existing trees. Technical Information Sheet 5. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFsoilimprovement2013.pdf
Stone, H.; Downer, A. (2013). Maintaining palm trees. Technical Information Sheet 7. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFpalms2013.pdf
Stone, H.; Downer, A. (2013). Managing infrastructure conflicts with trees. Technical Information Sheet 6. The John Britton Fund. https://www.wcisa.net/Post/Documents/BFinfrastructure2013.pdf
Stone, H.; Downer, A. (2013). Managing trees during the drought and water restrictions. Technical Information Sheet 1. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFdrought2013.pdf
Stone, H.; Downer, A. (2013). Maximizing the benefits of trees in hot climates. Technical Information Sheet 2. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFhotclimates2013.pdf
Downer, A.; Faber, B. (2013). "Pests Move but we should not help them! A reminder to professionals." CAPCA (California Association of Pest Control Advisers) Adviser 16(6): 36-37.
Stone, H.; Downer, A. (2013). Planting and early care of trees. Technical Information Sheet 4. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFplanting2013.pdf
Stone, H.; Downer, A. (2013). Responsible wood waste management. Technical Information Sheet 9. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFwoodwaste2013.pdf
Downer, A. (2013). Snake Oil, Arboricultural Myths, Legends and Persuaders in our Industry. Arboricultural Consultant. 46, 19-23.
Stone, H.; Downer, A. (2013). Trees, water and irrigation. Technical Information Sheet 10. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFirrigation2013.pdf
Downer, A. (2013). Ventura County Master Gardeners support agriculture. Farm Bureau of Ventura County. 65:1, 4.
Downer, A. (2012). "10 Tips for Healthy Trees." Southwest Trees and Turf 19: 1, 10.
Downer, A. (2012). "Botany for arborists VIIâRoots: their anatomy and formation." Western Arborist 38(1): 56-58.
Downer, A. (2012). "Botany for arborists VIIIâThe rhizosphere: root interactons with soil, microbial communities for food webs and plant pathogens." Western Arborist 38(4): 56-61.
Downer, A.; Karlik, J.; Howell, A. (2012). "Effect of Pruning severity on flowering of landscape roses." HortScience 47
Hodel, D.; Downer, A.; Mochizuki, M.; Pittenger, D. (2012). Effect of Sand Backfill When Transplanting Palms. Final Report to California Landscape Contractors Association. Sacramento, CA. http://www.clca.us/research/
Mayorquin, J.; Downer, A.; Hodel, D.; Liu, A.; Eskalen, A. (2012). "Ficus branch canker of Indian laurel-leaf fig." Western Arborist 38(1): 60-61.
Downer, A. (2012). "Landscape trees are threatened by new diseases." Farm Bureau of Ventura County 64(4): 2.
Downer, A.; Hodel, D.; Matthews, D.; Pittenger, D. (2012). "Susceptibility of landscape palms to Fusarium oxysporum f.sp. canariensis under nitrate and ammoniacal fertilization." HortScience 47(9): S84.
Mochizuki, M.; Hodel, D.; Downer, A. (2012). "The effect of container type on the nursery growth of kentia palms and king palms." HortScience 47(9): S83.
Hodel, D.; Downer, A.; Pittenger, D. (2012). "The effect of leaf removal and tie up on water loss and estimated crop coefficients of juvenile trunkless containerized canary island date palms and queen palms." HortScience 47(9): S82.
Hodel, D.; Mochizuki, M.; Pittenger, D.; Downer, A. (2012). "The effect of sand backfill on transplanted palms." HortScience 47(9): S83.
Downer, A. (2012). "Trees vs. TurfâLose/Lose?" Southwest Trees and Turf 19(5): 1, 10.
Downer, A. (2012). "Why Trees Die." Western Arborist 38(1): 28-34.
Downer, A. (2011). "Botany for arborists Part V: (secondary xylem)." Western Arborist 37(3): 42-45.
Downer, A. (2011). "Botany for arborists VI: Phloem, secondary phloem and bark." Western Arborist 37(4): 48-52.
Downer, A. (2011). Drought imperils landscape trees. Farm Bureau of Ventura County Newsletter. 65, 2.
Hodel, D.; Downer, A. (2011). "Landscape tree diseases: Part 2: Anthracnose disease on Chinese elm." Western Arborist 37(4): 58-60.
Downer, A. (2011). Mulches benefit Ventura County agriculture. Farm Bureau of Ventura County Newsletter. 63, 2, 4.
Downer, A. (2011). Snake oil, horticultural myths, horticultural urban legends and persuaders in our industry. Topics in Subtropics. 9, 4-8.
Downer, A.; Hodel, D.; Mochizuki, M. (2010). "A comparison of âair root pruningâ and conventional plastic container for cultivation of two palm species." HortScience 45(8): S106.
Downer, A.; Greene, R. (2010). "Affect of above and below grade planting on four landscape trees in Southern California." HortScience 45(8): S129.
Downer, A. (2010). Biology and control of Armillaria melleaâthe oak root fungus. Landscape Disease Symposium (Proceedings), Camarillo, California.
Downer, A. (2010). "Botany for arborists: Part 1." Western Arborist 36(2): 54-55.
Downer, A. (2010). "Botany for arborists: Part II." Western Arborist 36(3): 60-61.
Downer, A. (2010). "Botany for arborists: Part III." Western Arborist 36(4): 16-18.
Downer, A. (2010). "Botany for arborists: Part IV: Plant anatomy." Western Arborist 37(1): 62-64.
Downer, A. (2010). "Control of root rot in the landscape with mulches." CAPCA (California Association of Pest Control Advisers) Adviser 13(6): 32-34.
Downer, A. (2010). "Diagnosing Landscape Diseases." CAPCA (California Association of Pest Control Advisers) Adviser 13(4): 28-30.
Downer, A. (2010). Digital diagnosis. Landscape Notes. 23. http://ceventura.ucdavis.edu
Downer, A. (2010). "Drought Survival Tips, Part II." Southwest Trees and Turf 17: 1.
Downer, A.; Hodel, D.; Mochizuki, M. (2010). "Effect of deep planting on landscape shrubs." HortScience 45(8): S129.
Hodel, D.; Downer, A.; Pittenger, D. (2010). "Effect of leaf removal and tie up on large, mature date palms transplanted in extremely hot conditions." HortScience 45(8): S91-92.
Hodel, D.; Downer, A.; Pittenger, D. (2010). "Effect of sand backfill on transplanted palms." Procs. HortScience 45(8): S92.
Downer, A.; Faber, B.; Mochizuki, M. (2010). "Effect of soil disturbance, organic matter and Trichoderma on survival of peach in soil infested witih Armillaria mellea." HortScience 45(8): S113.
Downer, A. (2010). Hey its conk season keep an eye on your palms. Landscape Notes. 23. http://ceventura.ucdavis.edu
Downer, A. (2010). "Organic amendments and sulfur can lower soil pH levels." Farm Bureau of Ventura County 62: 2.
Mochizuki, M.; Downer, A.; Faber, B. (2010). "Organic amendments and sulfur in combination reduce soil pH." HortScience 45(8): S91.
Downer, A. (2010). Potting media studies. Landscape Notes. 23. http://ceventura.ucdavis.edu
Downer, A. (2010). Use of Mulches to control weeds in landscapes. Landscape Notes. 23. http://ceventura.ucdavis.edu
Corkidi, L.; Merhaut, D.J; Allen, E.B.; Downer, A.J.; Bohn, J.; Evans, M. (2010). "Use of mycorrhizal colonization to reduce nitrogen and phosphorus leaching from nursery containers." Procs. HortScience 45(8): S88.
Downer, A. (2010). "What do you know?" Southwest Trees and Turf 17: 1, 10.
Downer, A. (2010). Why Trees Die. Landscape Notes. 24. http://ceventura.ucdavis.edu
Downer, A. (2009). "Drought Survival Tips." Southwest Trees and Turf 16: 1, 10.
Downer, A. (2009). Drought, "water-wise" gardens and saving water in landscapes. Landscape Notes. 22. http://ceventura.ucdavis.edu
Hodel, D.; Downer, A.; Pittenger, D. (2009). Effect of sand backfill on transplanted palms. Report to E. J. Slosson Endowment for Ornamental Horticulture. University of California, Agriculture and Natural Resources. http://groups.ucanr.org/slosson/documents/newsletter1713.htm
Downer, A. (2009). Effects of mulches on Trees. Plant and Soil Conference (Proceedings), Fresno, Ca.
Downer, A. (2009). Establishing landscape trees. Landscape Notes. 22. http://ceventura.ucdavis.edu
Downer, A. (2009). Mulch effects on trees. Landscape Notes. 22. http://ceventura.ucdavis.edu
Downer, A. (2009). "Mulch effects on trees." Western Arborist 35: 30-34.
Downer, A. (2009). Oaks can thrive with little care. Farm Bureau of Ventura County Newsletter. 59, 4, 6.
Downer, A. (2009). "Satisfy treesâ needs to succeed." Southwest Trees and Turf 16: 1, 14-15.
Downer, A. (2009). "Snake oil horticultural myths, horticultural urban legends, and persuaders in our industry." Applicator News 24: 4-5.
Downer, A.; Faber, B. (2009). Soil Acidification with Organic Amendments and Sulfur. Final Report to the U.C. Hansen Trust. http://groups.ucanr.org/Hansen/documents/2006-200718399.pdf
Hodel, D.; Downer, A.; Matthews, D. (2009). "Sooty canker a devastating disease of Indian Laurel-leaf fig trees." Western Arborist 35(4): 28-33.
Corkidi, L.; Merhaut, D.; Allen, E.; Downer, A.; Bohn, J.; Evans, M. (2009). Use of mycorrhizal fungi to increase nutrient use efficiency and reduce nitrogen and phosphorus leaching in nursery conditions. Annual Meeting of the International Plant Propagators Society (Proceedings), San Diego, California.
Downer, A. (2009). What is wrong with my pygmy date palms?? Landscape Notes. 22. http://ceventura.ucdavis.edu
Downer, A. (2009). "Whatâs wrong with Pygmy Date Palms?" Southwest Trees and Turf 16: 1, 8.
Downer, A. (2008). "Controlling landscape diseases." Southwest Trees and Turf 15: 1, 14.
Pittenger, D.; Downer, A.; Hodel, D. (2008). "Estimating water needs of landscape palms." HortScience 43: 1060-1061.
Downer, A. (2008). "Extension supports ornamental production." Farm Bureau of Ventura County 60(10): 2-4.
Downer, A. (2008). Lepidoptera pests of landscapes. Landscape Disease Symposium (Proceedings), Santa Paula, California.
Downer, A. (2008). Let the wet begin. Landscape Notes. 21. http://ceventura.ucdavis.edu
Downer, A.; Hodel, D.; Pittenger, D. (2008). "Pruning palms." HortScience 43: 1060.
Downer, A.; Faber, B.; Mochizuki, M.; Holstege, D. (2008). "Soil pH reduction with sulfur, amendments, and a cover crop." HortScience 43: 1234.
Hodel, D.; Downer, A.; Pittenger, D. (2008). "Transplanting and planting palms." HortScience 43: 1060.
Downer, A. (2008). "Unraveling the web of soil microbiology." Arborist News 17: 12-16.
Faber, B.; Downer, A. (2007). Are all phosphorous products the same? Topics in Subtropics. 5, 3-4.
Downer, A. (2007). Controlling landscape diseases. Landscape Notes. 21. http://ceventura.ucdavis.edu
Downer, A. (2007). Deep planting kills. Landscape Notes. 20. http://ceventura.ucdavis.edu
Downer, A. (2007). Diagnosing Your Oak Tree Part II: Insects. Landscape Notes. 20. http://ceventura.ucdavis.edu
Downer, A. (2007). "Diagnosing your oak tree: Part I, Diseases." Western Arborist 33: 34-40.
Downer, A.; Hodel, D.; Mochizuki, M. (2007). "Effects of pre-plant incorporation and post-planting application of a palm special fertilizer on five species of landscape palms." HortScience 42: 878.
Faber, B.; Downer, A. (2007). Evaluation of commercially available phosphonate products for control of Phytophthora cinnamomi. 11th World Avocado Congress (Proceedings), Santiago, Chile.
Downer, A. (2007). "Fusarium wilt pathogen of Phoenix canariensis is a soil survivor." Western Arborist 33: 15.
Downer, A. (2007). Gardens are constantly changing. Ventura County Star Newspaper.
Downer, A. (2007). "Go out and diagnose those diseases." Southwest Trees and Turf 14: 1, 14.
Downer, A.; Hodel, D. (2007). "Leaf removal from Washingtonia filifera does not prevent infection by Phaeochoropsis neowashingtoniae, but does predispose palms to early death from pink rot, Gliocladium vermoeseni." HortScience 42: 978.
Daugovish, O.; Downer, A.; Mochizuki, M. (2007). "Mustard derived biofumigation for lettuce in coastal California." HortScience 42: 953.
Downer, A. (2007). "New thrips pest attacks Myoporum." Western Arborist 33: 24.
Downer, A. (2007). Palm Diseases. Landscape Disease Symposium (Proceedings), Santa Paula, California.
Downer, A. (2007). "Palm trunk decays are definitely in California." Western Arborist 33: 15.
Downer, A. (2007). Plant Health: A pathologistâs understanding. Procs. of the Landscape Disease Symposium, Santa Paula, CA.
Downer, A. (2007). Plant Health: A pathologist's understanding. Landscape Diseases Symposium (Proceedings), Santa Paula, California.
Downer, A. (2007). "Planting; not a deep subject." Southwest Trees and Turf 14: 1, 14-15.
Downer, A.; Hodel, D.; Pittenger, D.; Mochizuki, M. (2007). "Poor postharvest handling and storage of transplanted Washingtonia robusta palms does not slow or prevent establishment in landscapes." HortScience 42: 978-979.
Hodel, D.; Downer, A.; Pittenger, D. (2007). "Recent palm horticultural research at the University of California." The Palm Journal 187(39-44)
Downer, A. (2007). Research Results: Palm Fertility. Landscape Notes. 20. http://ceventura.ucdavis.edu
Downer, A. (2007). "Snake oil, horticultural myths, horticultural urban legends, and persuaders in our industry." Arborist News 16: 30-34.
Faber, B.; Downer, A. (2007). "Soil test kits." Western Arborist 33: 55.
Downer, A. (2007). The Wintersmith was Here. Landscape Notes. 20. http://ceventura.ucdavis.edu
Downer, A. (2007). Use mulches now to save water and prevent weeds. Ventura County Star Newspaper.
Daugovish, O.; Downer, A. (2007). "Using palm trunk fibers as peatmoss replacements for container media." HortScience 42: 877.
Downer, A. (2006). Abiotic diseases and disorders of landscape plants. Landscape Disease Symposium (Proceedings), Oak View, California.
Downer, A. (2006). Diagnosing Your Oak Tree Part I: Diseases. Landscape Notes. 19. http://ceventura.ucdavis.edu
Downer, A. (2006). Fusarium wilt pathogen is a soil survivor. Landscape Notes. 19. http://ceventura.ucdavis.edu
Faber, B.; Downer, A. (2006). "Mulches in avocado." UC Delivers Story
Daugovish, O.; Downer, A.; Mochizuki, M. (2006). Mustard-derived biofumigation for lettuce in Coastal California. 2nd Interntional Biofumigation Symposium (Proceedings), Moscow, Idaho.
Downer, A. (2006). New thrips pest attacks Myoporum. Landscape Notes. 19. http://ceventura.ucdavis.edu
Downer, A. (2006). Palm trunk decays are definitely in California. Landscape Notes. 19. http://ceventura.ucdavis.edu
Downer, A. (2006). "Palms and palm disorders." Western Arborist 32(4): 24-25.
Downer, A. (2006). "Palms puzzle pathologists." Southwest Trees and Turf 13: 1, 14.
Downer, A. (2006). "Snake oil in horticulture." Western Arborist 32(3): 14-17.
Downer, A. (2006). Snake Oil, Horticultural Myths, Horticultural Urban Legends, and Persuaders in our Industry. Landscape Notes. 19. http://ceventura.ucdavis.edu
Downer, A. (2006). Some factors about soil that you need to know to understand the biology of the oak tree in California. Landscape Notes. 19. http://ceventura.ucdavis.edu
Downer, A. (2006). "Where oaks grow." Western Arborist 32: 14-17.
Hodel, D.; Downer, A. (2005). A presentation of research findings from the University of California, Cooperative Extension. Palm Research Symposium (Proceedings), The Huntington Botanical Gardens, San Marino, University of California Cooperative Extension, Los Angeles and Ventura.
Downer, A. (2005). An introduction to the FungiâWho they are, how they grow and why they make such good plant pathogens. Landscape Disease Symposium (Proceedings), Santa Paula, California.
Downer, A. (2005). "Education: A valuable commodity." Southwest Trees and Turf 12: 1, 14.
Downer, A. (2005). "Pruning Oaks." Western Arborist 31: 46-50.
Downer, A. (2005). "Some factors you need to know to understand the biology of the oak tree in California." Western Arborist 31: 34-37.
Downer, A. (2004). "Blow wind blow." Southwest Trees and Turf 10: 6.
Downer, A. (2004). Catastrophic Tree Damage from Wind. Landscape Notes. 18. http://ceventura.ucdavis.edu
Downer, A. (2004). Dendroctonus valens: The Red Turpentine beetle. Landscape Notes. 18. http://ceventura.ucdavis.edu
Downer, A. (2004). Disease Notes: Armillaria Root Rot. Landscape Notes. 17. http://ceventura.ucdavis.edu
Downer, A. (2004). "Disease notes: Armillaria root rot." Western Arborist 30: 24-27.
Downer, A. (2004). Organic Amendments and Mulches for Palms: Mulching vs Amending. Landscape Notes. 18. http://ceventura.ucdavis.edu
Downer, A. (2004). Palm Tree Management Part I: selecting the right palm. Landscape Notes. 18. http://ceventura.ucdavis.edu
Downer, A. (2004). Pruning Oaks. Landscape Notes. 18. http://ceventura.ucdavis.edu
Corkidi, L.; Allen, E.; Merhaut, D.; Allen, M.; Downer, A.; Bohn, J.; Evans, M. (2004). "The use of mycorrhizal inoculants in the ornamental nursery industry." Cohort 6: 6-10.
Downer, A. (2004). "Whatâs up with the redwoods?" Western Arborist 30: 10-11.
Downer, A. (2004). What's up with Redwoods. Landscape Notes. 18. http://ceventura.ucdavis.edu
Dahlsten, D.; Rowney, D.; Robb, K.; Downer, A.; Shaw, D.; Kabashima, J. (2003). Biological control of introduced psyllids on eucalyptus. International Conf. on Biological Control USDA Forest Service (Proceedings), Publication FHTET â 03 â 05.
Downer, A. (2003). Diseases of Palm Trees: Some new some old. Landscape Disease Symposium (Proceedings), Santa Paula, California.
Faber, B.; Downer, A.; Menge, J. (2003). Effects of mulch on avocado and citrus. 5th World Avocado Congress (Proceedings), Malaga, Spain.
Downer, A.; Faber, B. (2003). "Effects of mulches on trees." Southwest Trees and Turf 8: 1, 14.
Daugovish, O.; Downer, A.; Becker, O. (2003). Exploring biofumigational potential of mustards. Annual International Research Conference on Methyl Bromide Alternative and Emissions Reductions, San Diego, CA.
Daugovish, O.; Downer, A.; Becker, O. (2003). Exploring biofumigational potential of mustards. 2003 Annual International Research Conference on Methyl Bromide Alternatives and Emissions Reductions (Proceedings), San Diego, California.
Downer, A. (2003). "Observations of Fusarium wilt on palms." Pacific Coast Nurseryman 62: 66-67.
Downer, A. (2003). Palm Disease Note - Pink Rot. Landscape Notes. 17. http://ceventura.ucdavis.edu
Downer, A. (2003). Palm Disease Note: Fusarium Wilt or Not? Landscape Notes. 17. http://ceventura.ucdavis.edu
Downer, A. (2003). "Palm disease notes, continued: pink rot." Pacific Coast Nurseryman 63: 66-67.
Downer, A. (2003). Powdery Mildew on Oak - It's Everywhere! Landscape Notes. 17. http://ceventura.ucdavis.edu
Downer, A. (2003). "Powdery mildew on oakâItâs everywhere." Western Arborist 29: 53.
Downer, A. (2003). Pruning to Control Diamond Scale. Landscape Notes. 17. http://ceventura.ucdavis.edu
Hodel, D.; Pittenger, D.; Downer, A. (2003). Root system regeneration and resprouting in palms (Arecaceae). Monocots III: The Third International Conference on the Comparative Biology of the Monocotyldedons. March 30-April 5, 2003. http://monoctos3.org/pdf/abstracts.pdf
Becker, J.; Chen, X.; Wilen, C.; Downer, A. (2003). Root-knot nematode-destroying microorganisms for home garden and landscape us. Reports of the Elvenia J. Slosson Endowment. 11.
Downer, A. (2003). Snake oil: horticultural myths, urban horticulture legends, frauds, and carpetbaggers in our industry. Landscape Disease Symposium (Proceedings), Santa Paula, California.
Pittenger, D.; Hodel, D.; Downer, A. (2003). "Transplanting specimen palms: common practices and research-based information." HortScience 38: 836.
Downer, A. (2003). Trunk injection with Tribloxystrobin and Myclobutanil to control powdery mildew in coast live oak. Landscape Notes. 17. http://ceventura.ucdavis.edu
Downer, A. (2002). "Planting depthâA common and serious cause of tree deaths." Western Arborist 28: 8-9.
Becker, J.; Han, P.; Wilen, C.; Downer, A. (2002). Root knot nematode destroying microorganisms for home garden and landscape use. Reports of the Elvenia J. Slosson Endowment. 8.
Downer, A. (2002). Survival of fungal pathogens in static yardwaste piles. Landscape Disease Symposium (Proceedings), Simi Valley, California.
Pittenger, D.; Downer, A. (2002). "The herbicide contaminated compost issue." California Landscaping: 32-34.
Downer, A. (2002). The Herbicide contaminated Compost Issue. Landscape Notes. 16. http://ceventura.ucdavis.edu
Downer, A. (2001). Conk season. Landscape Notes. 15. http://ceventura.ucdavis.edu
Downer, A. (2001). Diagnosing and curing diseases in large specimen treesâA challenge for the arboricultural consultant. Landscape Disease Symposium (Proceedings).
Downer, A. (2001). Disease spotlight: Root rot caused by Oxyporus latemarginatus. Landscape Notes. 15. http://ceventura.ucdavis.edu
Downer, A. (2001). Lerp psyllid news. Landscape Notes. 15. http://ceventura.ucdavis.edu
Downer, A. (2001). New diseases of known and unknown cause in California landscapes. Landscape Disease Symposium (Proceedings).
Faber, B.; Downer, A.; Menge, J. (2001). Phytophthora control with mulches. Gordon Conference. Ventura, California.
Downer, A. (2001). Planting depths a common and serious cause of tree deaths. Landscape Notes. 15. http://ceventura.ucdavis.edu
Dahlsten, D.; Rowney, D.; Erbiligin, N.; Lawson, A.; Roltsch, W.; Chaney, W.; Costello, L.; Downer, A.; Kabashima, J.; Robb, K.; Shaw, D. (2001). Red gum lerp psyllid biological control in California. National Entomological Society Meeting (Proceedings Poster), San Diego, California.
Downer, A.; Pittenger, D.; Hodel, D. (2001). "Root regeneration of landscape palms." HortScience 36: 430.
Downer, A. (2000). Calcium based control of Phytophthora root rots. Landscape Notes. 15. http://ceventura.ucdavis.edu
Downer, A. (2000). Death by Compost: response of ornamental plants to toxic organic substrates. Landscape Disease Symposium (Proceedings), Oak View, California.
Downer, A. (2000). Grass control in bedding plants. Landscape Notes. 15. http://ceventura.ucdavis.edu
Pittenger, D.; Downer, A.; Hodel, D. (2000). Palm root regeneration and its significance in transplanting. Proceedings of the 11th Conference of the Metropolitan Tree Improvement Alliance, Gresham, OR.
Faber, B.; Downer, A.; Menge, J. (2000). Phytophthora control with mulches (Poster). Nelson, New Zealand, International Society of Horticultural Science.
Downer, A. (2000). Plant Pathogens in organic substrates and disease suppression with mulches. Microbiology of Compost Organic Mulches and Green Materials Seminar (Proceedings), Oak View, California.
Downer, A. (2000). Root rot management in the landscape. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
Downer, A. (2000). The role of organic materials in soil nutrient status. Microbiology of Compost Organic Mulches and Green Materials Seminar (Proceedings), Oak View, California.
Downer, A. (1999). A new pest of Eucalyptus citriodora. Landscape Notes. 14. http://ceventura.ucdavis.edu
Downer, A. (1999). Calcium based control of Phytophthora root rot. Landscape Disease Symposium (Proceedings).
Menge, J.; Faber, B.; Downer, A.; Crohn, D. (1999). Compost demonstration project southern California. Use of yard trimmings and compost on citrus and avocado. Integrated Waste Management Board. Publication #443-99-010, 36.
Downer, A. (1999). How to be a better Diagnostician: Tools, Tips and Techniques of the Trade. Landscape Disease Symposium (Proceedings).
Downer, A. (1999). Phytophthora an unseen meance in the landscape. Landscape Notes. 14. http://ceventura.ucdavis.edu
Downer, A. (1999). Roundup - the DDT of the nineties? Landscape Notes. 14. http://ceventura.ucdavis.edu
Downer, A.; Menge, J.; Ohr, H.; Faber, B.; McKee, B.; Pond, E.; Crowley, M.; Campbell, S. (1999). The effect of yard trimmings as a mulch on growth of avocado and avocado root rot caused by Phytophthora cinnamomi. California Avocado Society Yearbook. 83: 87-104.
Downer, A.; Menge, J.; Ohr, H.; Faber, B.; McKee, B.; Pond, E.; Crowley, M.; Campbell, S. (1999). "The effect of yard trimmings as a mulch on growth of avocado and avocado root rot caused by Phytophthora cinnamomi." California Avocado Society Yearbook 83: 87-104.
Faber, B.; Downer, A. (1999). Weed control problems using greenwaste. 51st Annual Weed Science Society of America (Proceedings), Anaheim, California.
Downer, A.; Faber, B. (1999). Weed control problems using greenwaste. 51st Annual Weed Science Society of America (Proceedings), Anaheim, CA.
Downer, A. (1999). Where have all the flowers gone? Landscape Notes. 14. http://ceventura.ucdavis.edu
Downer, A. (1998). Abiotic diseases/disorders of trees and landscape plants. Landscape Disease Symposium (Proceedings), Oak View, California.
Downer, A. (1998). Amendments and mulches for new landscape plantings. Installing New Landscapes âDoing it right the first time!! (Proceedings), Oak View, California.
Downer, A. (1998). Another new psyllid pest. Landscape Notes. 13.
Millar, J.; Paine, T.; Hanks, L.; Downer, A. (1998). Biological control of the eucalyptus snout beetle. Gonipteras scutellatus. Report of the Elvenia J. Slosson Fund for Ornamental Horticulture 1995-1998. University of California Division of Agriculture and Natural Resources. 53-56.
Downer, A. (1998). Flux diseases in trees. Landscape Notes. 13.
Downer, A. (1998). Giant whitefly hits Ventura. Landscape Notes. 13.
Faber, B.; Downer, A.; Menge, J.; Ohr, H. (1998). Mulch effects on avocado root rot. 3rd World Avocado Congressâ1995 (Proceedings), Haifa, Israel.
Downer, A. (1998). "Mulches for landscape use." Hawaii Landscape 25: 16-24.
Downer, A. (1998). "Mulching influence of the soil environment." Western Arborist 24: 18.
Hodel, D.; Downer, A.; Pittenger, D. (1998). Palm root regeneration. Landscape Below Ground II Workshop (Proceedings), San Francisco, International Soc. Arboriculture.
Downer, A. (1998). "Phytophthora cinnamomi an unseen menace in the landscape." Western Arborist 25: 27-29.
Downer, A. (1998). Plant diagnostic and soil testing labs in California. Landscape Notes. 13.
Downer, A. (1998). "The role of soil enzymes in control of P. cinnamomi." Western Arborist 24: 45-46.
Downer, A.; Craigmill, A. (1998). Toxicity of oleander derived compost. Report of the Elvenia J. Slosson Fund for Ornamental Horticulture 1995-1998. University of California Division of Agriculture and Natural Resources. 14-16.
Dagit, R.; Downer, A. (1998). "Transplanting coast live oaks in southern California." Western Arborist 24: 36-40.
Downer, A. (1997). "Aleppo blight." Western Arborist 23: 7.
Downer, A.; Menge, J.; Pond, E. (1997). "An enzymatic mechanism for biological control of Phytophthora cinnamomi." Phytopathology 87: 25.
Downer, A. (1997). Oh why oh why do my bedding plants die? Landscape Notes. 12.
Downer, A. (1997). "Solving the mystery of plant maladies." Southwest Trees and Turf 2: 1, 3.
Dagit, R.; Downer, A. (1997). Status of transplanted coast live oaks in southern California. 2nd Interface Between Ecology and Land Development in California (Proceedings), Occidental College.
Downer, A. (1997). The role of soil Enzymes in Control of Phytophthora cinnamomi. Landscape Disease Symposium (Proceedings), Oak View, California.
Faber, B.; Downer, A. (1997). Yardwaste mulches in avocado and citrus orchards. Pacific Division of the American Association For the Advancement of Science.
Downer, A. (1996). Abiotic diseases and disorders of landscape plants. Landscape Disease Symposium (Proceedings), Oak View, California.
Downer, A. (1996). Aleppo blight. Landscape Notes. 11.
Downer, A. (1996). Chemical turfgrass edging. Landscape Notes. 11.
Downer, A. (1996). Eucalyptus snout beetle update. Landscape Notes. 11.
Breuninger, J.; Cudney, D.; Downer, A.; Gibeault, V.; Henry, J. (1996). "Kikuyugrass management in turf with turflon ester in California." Down To Earth 51: 1-5.
Downer, A. (1996). Lantanna blight is back. Landscape Notes. 11.
Downer, A. (1996). Oak drip: another insect problem. Landscape Notes. 11.
Downer, A. (1996). Snails 'n mulch. Landscape Notes. 11.
Faber, B.; Downer, A.; Sakovich, N.; McGiffen, M.; Cudney, D.; Mills, S. (1996). Yardwaste mulches in avocado and citrus orchards. Report of the Elvenia Slosson Fund. Division of Agriculture and Natural Resources.
Downer, A.; Faber, B. (1995). Determining the usefulness of eucalyptus mulches in landscape plantings. Annual Report of the Slosson Endowment. 28-30.
Cowles, R.; Downer, A. (1995). "Eucalyptus snout beetle detected in California." California Agriculture 49: 38, 40.
Downer, A. (1995). Kikuyugrass fertilization. Landscape Notes. 10.
Downer, A. (1995). Oleander poisoning. Landscape Notes. 10.
Downer, A. (1995). Organic dust toxic syndrome. Landscape Notes. 10.
Downer, A. (1995). Pine pitch canker. Landscape Notes. 10.
Downer, A. (1995). Yardwaste mulches and weed control. Landscape Notes. 10.
Downer, A. (1994). A new pest of eucalyptus. Landscape Notes. 9.
Downer, A. (1994). Effect of mulches and turfgrass on palm growth. Landscape Notes. 9.
Hodel, D.; Downer, A. (1994). Effects of mulches on the growth of palms. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
Cowles, R.; Downer, A. (1994). "Eucalyptus snout beetle." HortScript 8
McGiffen, M.; Manthey, J.; Baameur, A.; Greene, R.; Faber, B.; Downer, A.; Aguilar, J. (1994). Field tests of methanol as a crop yield enhancer. 1994 Western Plant Growth Regulator Symposium (Abstracts).
McGiffen, M.; Manthey, J.; Baameur, A.; Greene, R.; Faber, B.; Downer, A.; Aguilar, J. (1994). "Field tests of methanol as a crop yield enhancer." HortScience 29: 459.
Cudney, D.; Downer, A.; Henry, J.; Gibeault, V. (1994). Kikuyugrass management in cool and warm season turf. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
Cudney, D.; Downer, A.; Gibeault, V.; Henry, J.; Reints, J. (1994). "Low-impact management of kikuyugrass in cool-season turf." California Fairways
Downer, A.; Faber, B. (1994). "Organic mulches and amendments for shade trees." Arbor Age 14: 8-10.
Faber, B.; Downer, A.; Yates, L. (1994). "Portable soil meters." American Nurseryman 179: 93-94.
Downer, A. (1994). Studies on Yardwaste use in the landscape. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
Downer, A.; Faber, B. (1994). "The effect of eucalyptus mulches on germination of annual and perennial weed species." HortScience 29: 555.
Downer, A.; Shaw, M.; Pittenger, D. (1994). "The effect of pruning on branch growth in two oak species." HortScience 29: 550.
Downer, A.; Cowles, R. (1994). "The eucalyptus snout beetle: a new threat to eucalyptus in California." Western Arborist 20: 18-19.
Cudney, D.; Downer, A.; Gibeault, V.; Henry, J.; Reints, J. (1993). "A new, non-disruptive alternative for kikuyugrass management in cool-season turf." California Turfgrass Culture 42: 1-4.
Downer, A.; Pittenger, D.; Faber, B.; Rogers, P. (1993). Biosolids increase yield and color of perennial ryegrass when added to yardwaste composts. Ornamental Horticulture Control Conference (Proceedings), Riverside, California.
Downer, A. (1993). Effects of pruning sycamores. Landscape Notes. 8.
Downer, A. (1993). Eucalyptus borer resistance. Landscape Notes. 8.
Downer, A. (1993). Eugenia psyllid relief. Landscape Notes. 8.
Downer, A. (1993). Grasscycling. Landscape Notes. 8.
Downer, A.; Faber, B.; White, R. (1993). Green waste compost for landscaping--a demonstration project. 1993 Plant and Soil Conference. Sacramento, CA.
Downer, A.; Faber, B.; White, R. (1993). Green waste compost for landscaping--a demonstration project. 1993 Plant and Soil Conference (Proceedings), Sacramento, California.
Cudney, D.; Downer, A.; Henry, M.; Gibeault, V. (1993). Integrated kikuyugrass management in cool season turf. Ornamental Horticulture Control Conference (Proceedings), Riverside, California.
Downer, A. (1993). "Mulch matters." The Broadcaster 43: 3-4, 24.
Downer, A. (1993). Mulching bedding plants. Landscape Notes. 8.
Downer, A. (1993). Oleander poisoning. Landscape Notes. 8.
Downer, A.; Pittenger, D.; Faber, B.; Rogers, P. (1993). "Sewage sludge increases yield and color of perennial ryegrass when added to yardwaste composts." HortScience 28: 541.
Downer, A. (1993). The truth about eucalyptus. Landscape Notes. 8.
Downer, A. (1993). Transplanting palms. Landscape Notes. 8.
Downer, A. (1993). Trunk temperatures of California sycamore. Ornamental Horticulture Control Conference (Proceedings), Riverside, California.
Downer, A.; Koehler, C.; Paine, T. (1992). Biology and management of eugenia psyllid. 33rd Annual Entomology Conference (Proceedings).
Downer, A.; Faber, B.; Schuh, U.; Pittenger, D.; White, R. (1992). "Composted and fresh eucalyptus chip mulches promote early establishment of California sycamore." HortScience 27: 686.
Downer, A. (1992). Controlling shrub growth. Landscape Notes. 7.
Downer, A. (1992). Disease alert. Landscape Notes. 7.
Downer, A.; Faber, B.; White, R. (1992). "Effects of hydrophilic polymers and organic amendments on establishment of Kentucky bluegrass." HortScience 27: 588.
Downer, A. (1992). Eucalyptus borer. Landscape Notes. 7.
Downer, A. (1992). Evaluating soil amendments and polymers for use in the landscape. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
Shaw, A.; Downer, A.; Faber, B. (1992). Irrigation scheduling of California live oak (Quercus agrifolia) in a production nursery. 73rd Annual Meeting of the Pacific Division of the American Association For the Advancement of Science (Abstracts). 50.
Downer, A.; Cudney, D.; Henry, M.; Gibeault, V.; Cockerham, S. (1992). "Kikuyugrass control in cool season turfgrass." HortScience 27: 676.
Downer, A. (1992). Mulching mowers. Landscape Notes. 7.
Downer, A. (1992). Polymer studies. Landscape Notes. 7.
Downer, A. (1991). Blue gum psyllid is here. Landscape Notes. 6.
Downer, A. (1991). Effect of water absorbing polymers and organic soil amendments on performance of cools season turfgrass. Turfgrass Research Conference and Field Day (Proceedings), Riverside, California.
Downer, A. (1991). Inexpensive moisture meters do they work. Landscape Notes. 6.
Downer, A. (1991). Kikuyugrass control. Landscape Notes. 6.
Cudney, D.; Downer, A.; Gibeault, V.; Elmore, C.; Reints, J. (1991). Kikuyugrass control studies in southern California. Turfgrass Research Conference and Field Day (Proceedings), Riverside, California.
Downer, A. (1991). Kikuyugrass fertility studies. Landscape Notes. 6.
Downer, A. (1991). Mulching project update. Landscape Notes. 6.
Downer, A.; Koehler, C. (1990). Eugenia psyllid. Division of Agriculture and Natural Resources. Publication #7190.
Downer, A.; Kabashima, J.; Paine, T.; Koehler, C. (1990). "Eugenia psyllid update." Pacific Coast Nurseryman 49: 40.
Downer, A. (1990). Eugenia psyllid update. Landscape Notes. 5.
Downer, A. (1990). "How to save water in landscapes." The Broadcaster 43: 5, 28-30.
Cudney, W.; Downer, A.; Elmore, C.; Gibeault, V. (1990). Kikuyugrass control studies. Turfgrass Research Conference and Field Day (Proceedings).
Downer, A. (1990). Kikuyugrass research. Landscape Notes. 5.
Downer, A. (1990). More Eugenia psyllids. Landscape Notes. 5.
Downer, A.; Ohr, H. (1990). "Palms trees have problems too." Grounds Maintenance 24: 94, 100, 102.
Downer, A. (1990). Polymers polymers polymers. Landscape Notes. 5.
Downer, A. (1990). Snails snails snails. Landscape Notes. 5.
Downer, A. (1990). To mulch or not? Landscape Notes. 5.
Ohr, H.; Downer, A. (1989). "Diseases of palm trees." International Society of Arboriculture - Western Chapter News 15: 42-43.
Ohr, H.; Downer, A. (1989). Diseases of palm trees. 1988-1989 Annual Report Turfgrass and Ornamentals Research. 26.
Downer, A. (1989). Drought effects on turfgrass for 1989. Landscape Notes. 5.
Koehler, C.; Downer, A. (1989). "Eugenia psyllid update." Southwest Lawn and landscape 5: 23, 27.
Downer, A. (1989). Eugenia psyllids are here. Landscape Notes. 5.
Downer, A. (1989). Eugenia psyllids update. Landscape Notes. 5.
Cudney, D.; Elmore, C.; Gibeault, V.; Downer, A.; Van Dam, J.; Shaw, A.; Cockerham, S. (1989). Management and control of unwanted species in turf. 1988-1989 Annual Report Turfgrass and Ornamentals Research. 38.
Cudney, D.; Elmore, C.; Gibeault, V.; Downer, A.; Van Dam, J.; Shaw, A.; Cockerham, S. (1989). Management and control of unwanted species in turf. 1988-1989 Annual Report Turfgrass and Ornamentals Research. 38.
Cudney, D.; Elmore, C.; Gibeault, V.; Downer, A.; Van Dam, J.; Shaw, A.; Cockerham, S. (1989). Management and control of unwanted species in turf. 1988-1989 Annual Report Turfgrass and Ornamentals Research. University of California, Riverside. 38.
Downer, A. (1989). Managing turfgrass during drought. Landscape Notes. 5.
Downer, A. (1989). New turfgrass diseases. Landscape Notes. 5.
Downer, A.; Ohr, H. (1989). "Palm trees have problems too." Grounds Maintenance 24: 94-102.
Svihra, P.; Downer, A.; Molinar, R.; Koehler, C. (1989). Peppertree psyllid control. Division of Agriculture and Natural Resources. Publication #7188.
Downer, A. (1989). Pesticide training made easy. Landscape Notes. 5.
Downer, A. (1989). Pine Pitch Canker in Santa Barbara County. Landscape Notes. 5.
Downer, A.; Cudney, D. (1989). "Research shows no residue effects from glyphosate." California Landscape 14: 28-29.
Downer, A. (1989). The baccharis beetle is back. Landscape Notes. 5.
Downer, A. (1989). The truth about water absorbing polymers! Do they work? Landscape Notes. 5.
Downer, A. (1988). Another gazania disease. Landscape Notes. 4.
Downer, A. (1988). Disease of palms. Landscape Notes. 4.
Downer, A. (1988). Disease of Poa annua on golf courses. Landscape Notes. 4.
Downer, A. (1988). Fruit control in ornamental trees. Landscape Notes. 4.
Downer, A. (1988). Gazania crown rot. Landscape Notes. 4.
Downer, A. (1988). Ice plant failure. Landscape Notes. 4.
Downer, A. (1988). More on gazania problems. Landscape Notes. 4.
Downer, A. (1988). More on tree injections. Landscape Notes. 4.
Downer, A. (1988). Shade tree problems disease or drought. Landscape Notes. 4.
Downer, A. (1988). The Eucalyptus long horned borer makes its debut. Landscape Notes. 4.
Downer, A. (1988). The most common landscape problems. Landscape Notes. 4.
Downer, A. (1988). The new pest of Ash. Landscape Notes. 4.
Downer, A. (1988). Weeds in hydroseeded turf. Landscape Notes. 4.
Downer, A. (1988). Wood decay in shade trees. Landscape Notes. 4.
Downer, A. (1987). Are wood chips hazardous. Landscape Notes. 3.
Downer, A. (1987). Boron - what levels are toxic to ornamentals. Landscape Notes. 3.
Downer, A. (1987). Diseases of shade trees. The Turf and Landscape Institute (Proceedings), Anaheim, California.
Downer, A. (1987). Fungicides how do they work. Landscape Notes. 3.
Downer, A. (1987). Inhibition of tall fescue germination by glyphosate (Roundup). Landscape Notes. 3.
Downer, A. (1987). Injections for oaks? Landscape Notes. 3.
Downer, A. (1987). Kikuyugrass management. Landscape Notes. 3.
Downer, A. (1987). "Learn how fungicides work." International Society of Arboriculture - Western Chapter News 13: 15-16.
Downer, A. (1987). Peppertree psyllid update - injections and implants. Landscape Notes. 3.
Downer, A. (1987). Systemics symposium. Landscape Notes. 3.
Downer, A. (1987). Understanding bark beetles. Landscape Notes. 3.
Downer, A. (1987). Watering a tricky business. Landscape Notes. 3.
Downer, A. (1986). "Anthracnose on Modesto ash." International Society of Arboriculture - Western Chapter News 12: 8.
Downer, A. (1986). Armillaria root rot some new information. Landscape Notes. 2.
Downer, A. (1986). Ash anthracnose continues. Landscape Notes. 2.
Downer, A. (1986). Chemical control of rust (turf). Landscape Notes. 2.
Downer, A. (1986). Diagnosing Shade Tree Problems. Landscape Notes. 2.
Downer, A. (1986). "Diagnosing shade tree problems." International Society of Arboriculture - Western Chapter News 12: 17-21.
Downer, A. (1986). Disease Notes. Landscape Notes. 2.
Downer, A. (1986). "Do tree injections work?" Tree Trimmers Log 41
Downer, A. (1986). Eucalyptus longhorned borers a threat to Eucalyptus Trees. Landscape Notes. 2.
Downer, A. (1986). Fireblight control. Landscape Notes. 2.
Downer, A. (1986). More on hazardous trees. Landscape Notes. 2.
Downer, A. (1986). More on insects. Landscape Notes. 2.
Downer, A. (1986). Oaks are affected by many insects. Landscape Notes. 2.
Downer, A. (1986). Pepper Tree Psyllid Update. Landscape Notes. 2.
Downer, A. (1986). Pepper tree psyllid update. Landscape Notes. 2.
Downer, A. (1986). Peppertree psyllid update. Landscape Notes. 2.
Downer, A. (1986). Proteas have diseases too. Landscape Notes. 2.
Downer, A. (1986). Spray nozzles and disease control. Landscape Notes. 2.
Downer, A. (1986). Staking causes tree failures? Landscape Notes. 2.
Downer, A. (1986). Turfgrass water use. Landscape Notes. 2.
Downer, A. (1986). What's killing Modesto Ash Trees. Landscape Notes. 2.
Downer, A. (1985). Insect control in the landscape. Landscape Notes. 1.
Downer, A. (1985). Landscape Trees. Landscape Notes. 1.
Downer, A. (1985). "Short refresher course in pruning -- a synopsis." Tree Trimmers Log 32
Armentrout, V.; Downer, A. (1984). "Development of infection cushions of Rhizoctonia solani on artificial surfaces." Phytopathology 74: 817.
Downer, A.; Armentrout, V. (1983). "The effect of host exudates on infection cushion morphogenesis of Rhizoctonia solani." Phytopathology 73: 958.

ANR Workgroup Associations

Floriculture and Nursery - Member
Landscape and Urban Horticulture - Member
Nematology - Member
Oak Woodland Conservation - Member
Pest Management in ANR - Member
Plant Pathology - Member
Urban Agriculture - Member
Waste Management and Compost - Member

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