Topics in Subtropics

• California inundated with invasive fruit flies
• Satellite-based irrigation tools to manage irrigation water more precisely in avocado groves
• Managing citrus mealybug – does ant control help?
• Phytoplasma Diseases of Palms in the USA
• Understanding fruit fly quarantines
• Cultivating Citrus Resilience to HLB in California
• Phenology and the Avocado
• The Annual California Avocado Society Meeting
• Pre-bloom foliar boron application on olive may improve yield

In this issue:

• IRCHLB?
• Pocket Gopher Management
• Phytophthora Diseases of California Citrus
• Airblast Sprayers
• Temperature Inversion Data Helps Guide Frost Responses
• Bodil Cass – New Subtropical Fruit IPM Specialist

In this issue:

• Avocado Production in the World:
  Observations of production and consumption
  growth
• USDA-APHIS Approves New Fuller Rose
  Beetle Mitigation – a Voluntary Option to
  Reduce Pesticide Applications
• DON’Ts – Suggestions for Citrus and
  Avocado Growers and Others
• California Efforts to Control Citrus HLB
• Dr. Hamutahl Cohen was appointed as an
  Entomology Advisor with UC Cooperative
  Extension in Ventura County.

In this issue:

• Avocado Sunblotch Viroid Disease
• Citrus Yellow Vein Clearing Virus
• Insects Common to Avocados

In this issue:

• Introducing Fatemeh Khodadadi, Assistant Professor of Extension and Plant Pathologist
• Agave Mites: A Tiny Menace
• New pest in young avocado orchards
• Planting Avocados
• One, one hundred, one thousand
• UCR Citrus Day, March 2, 2023

TOPICS IN THIS ISSUE – P. Rolshausen Editor

• Mycorrhizae: An Underground Support Network for Trees.

• Notes on Applying Gibberellic Acid (GA3) to Navel Orange and other Citrus in the San Joaquin Valley of California

• Saline Waters - A Growing Problem

• 35th Anniversary of the Nematode Quarantine Facility at the University of California Riverside

TOPICS IN THIS ISSUE – Craig Kallsen, Editor

• Natural enemies have significantly suppressed Asian Citrus Psyllid populations in southern California

• Synergizing IPM of Argentine and biocontrol of sap sucking pests with biodegradable hydrogels, infra-red sensors, and cover crops in commercial citrus orchards

• Irrigation Stress and Early-Navel Fruit Maturity

• High Density Citrus Planting
•  
• Eric Mussen, Apiculturist Passes

Topics in this issue:

• Phytophthora disease associated with citrus in California
• Is it root rot? Or? The 12 signs of ARR
• New avocado irrigation study
• GEM vs Hass?
• Area-Wide Treatment of ACP

In this Issue:

• Mandarin Rind Breakdown
• Breaking the Avocado Alternate Bearing Cycle
• California Society Award of Merit
• Calculating the Value of a Lemon Tree Loss

In this issue:

• Estimating Nitrogen Credits From Organic Matter Sources in Orchards
• Timing Ethylene Applications as a Function of Heat Unit Accumulation
• Summary of International Avocado Irrigation Trends
• The Avocado World has Lost a Star - Remembering Samuel Salazar-Garcia

In this issue:

• Black Fig Fly, New invasive pest

• Branch canker and dieback diseases associated with citrus in California

• Caloptilia, no longer a new pest

•Progress in Developing Mechanical
Harvesting for California Black Ripe
‘Manzanillo’ Table Olives

Developing a Nitrogen Fertilizer Plan for
Olive Orchards

Should I Pay for Avocado Pollination
Services?

Collaboration is Key to Saving Kern
County Citrus

Are Finger Limes Just Another Fad?

In this issue:

• Avocado Establishment Costs

• Soil Analysis
  
  
• Healthy Roots, Healthy Trees

• Avocado Weed Control
  
  
• Salt Leaching
  
  

Topics in Subtropics Newsletter, v. 18, Fall 2020

In this issue: 

TOPICS IN THIS ISSUE

• Proactive Management of the Avocado Seed Weevil, Heilipus lauri (Coleoptera: Curculionidae)
• False Chinch Bug in New Avocado Plantings
• Removing Avocado Suckers with Glyphosate
• Snapshot: The Mexican Date Industry
• UC Ag Experts Talk

Our numbering got off, but we're back on track. Welcome to v. 18 of Topics in Subtropics, Spring 2020.

TOPICS IN THIS ISSUE – Ben Faber, Editor

• An Automated Delivery System for Therapeutic Materials to Treat HLB Infected Citrus
• On-Farm Research
• Citrus Dry Root Rot
• Beth Grafton-Cardwell to Retire

ANNOUNCEMENTS:

• What are the UC Ag Experts Talking About?
• Memorial to Dr. Travis Bean

In this issue:

• Rattlesnakes in California Orchards
• What’s the Fuss Over Spotted Lantern Fly?
• Frost Freeze Recovery from February 2020
• Covid Virus Resources
• New Guidelines for Laurel Wilt Disease

In this issue ...

• Leveraging the Genomic Landscape of Avocado for Breeding Purposes (Vanessa Ashworth and Philippe Rolshausen)

• Fresh Market Raspberry in California (Natalie Solares and Alexander Putman)

• Weed Management in Citrus Orchards (Travis Bean)

Topics in this issue:

• A “boring” problem that’s generating a big interest in southern California
• How ants can be “good” in ag production systems
• Is Eucalyptus a Safe Material for Mulching Trees?
• Botryosphaeria Gummosis and Dieback of Citrus
• The online Lucid Key, Thrips of California, has been updated

In this issue:

• Introducing Your New Information Source for CDFA grants, Kern and Ventura Counties

• Spotlight on SWEEP in Citrus

• Low Pressure Guide to Low-Flow Irrigation Scheduling

• The So-Called “Leaf Fleck” Virus Diseases of Citrus

• Replanting Trees in Mature Citrus Groves

• What about Planting Lemons in Kern County?

In this Issue:

• Distinguishing Between Symptoms of Drought and Root Rot in Avocado
• Avocado Trunk Cankers
• Viruses Are Our Friends-and Maybe for Citrus Too
• Ground Squirrel and Other Vertebrate
  Control
• Meet our new Citrus Specialist at UC
  Riverside/Lindcove
• Meet our new Extension Tree Crops Spray
  Application Engineer
• UC Ag Experts Talk

Volume 17, Fall 2018

A new issue of Topics in Subtropics in available.

In this issue:

• California Citrus Network - an online forum to facilitate communication
• High Density Planting for Avocado
• Meet the new UC Riverside subtropical crops specialist

TOPICS IN THIS ISSUE

• Native Pollinators of California Avocado as Affected by Introduced Pollinator Gardens
• Which Way World Avocados?
• Evaluating Cost Effectiveness of High Density Planting of Avocados: Experiment on Water and Pruning
• Herbicide injury in avocados

In this Issue:

• A Taste of Coffee
• Colletotrichum Shoot Dieback: A New Disease of California Citrus
• Successfully Irrigating Potted Trees
• Update on Huanglongbing Disease in California Citrus

• South American Palm Weevil Threat
• Template to Estimate the Value of Tree Loss
• After the Fire and Before the Rain - What to Do

• Ah, Rats! ?
• So You Want To Install Soil Moisture Meters? ?
• Notes on Applying Gibberellic Acid (GA) to Navels in
  the Southern San Joaquin Valley of California ?
• Fall Leaf Tissue Sampling ?
• FREE!  Citrus:  UC IPM Pest Management  Guidelines

TOPICS IN THIS ISSUE:
 
•  Why has California red scale been so difficult to control? 
 
• Navel Orange Nitrogen Fertilization
• Recent Advances in Understanding the History of
Olive Domestication
• Upcoming UC Olive Center Events

In this issue:

• Revisiting an old study
• Shoot and Twig Dieback
• Alternative Crops
• Referendum Comments

• Real-Time Sensor for Early Detection of Citrus Huanglongbing (HLB)
• The 2016 International Citrus Conference
• UC Riverside Scientists Evaluate Trunk Injections of Pesticides for The Management of Ambrosia Beetles in California Avocados
• An Overview of Mango
• Water Based Latex Paint as a Means to Track Ambrosia Beetle Activity on Infested Trees

TOPICS IN THIS ISSUE:

• “We Shall Defend our Citrus, We Shall Fight in Backyards and Community Gardens, We Shall Fight in Organic and Conventional Citrus Orchards; We Shall Never Surrender.”

• Organic Control of Asian Citrus Psyllid is Challenging

• Citrus Clonal Protection Program (CCPP) and National Clean Plant Network (NCPN): A Model System for Management of Citrus Diseases

• Discouraging citrus varieties smuggling by offering easy access to pathogen-tested budwood

TOPICS IN THIS ISSUE:

Avocado Cultivars

Botanical Races and Genetic Footprints

Drought Induced Problems in Our Orchards

Blossom End Rot of Citrus

Using Organic Herbicides in Production Fields and Non-Crop Areas

Pocket Gopher and Ground Squirrel Control: Management Options for Citrus and Avocado Groves

In this issue:

• Predicting water usage along the coast versus in the valley
• Avocado Farms - what we have learned about fire readiness
• Olive Oil Quality

IN THIS ISSUE:

INTRODUCTION AND NEW RESEARCH

• Did a Newly Introduced Fukumoto Navel Budline from Spain Perform Better than the California Budline in the San Joaquin Valley?

• What values should olive growers use for estimating crop nitrogen removal at harvest?

UPCOMING COURSES

• UC Davis Olive Center: UC Master Milling Certificate Course

AUTHORS IN THIS ISSUE

Craig E. Kallsen University of California Cooperative Extension, Kern County

Neil V. O’Connell, University of California Cooperative Extension, Tulare County

Georgios Vidalakis, University of California, Riverside, Extension Specialist & Plant Pathologist, Director-Citrus Clonal Protection Program (CCPP)

Elizabeth J. Fichtner, Farm Advisor, UCCE Tulare County

In this issue:

• The Clegg Collection: A Valuable Resource
• Impacts of the recent drought conditions on Central Coast avocado production, and potential impacts of continued drought conditions
• Zinc and Phosphorus
• Recent findings on polyphagous shot hole borer/Fusarium dieback on avocado

In this issue:

• Vole Damage to Citrus
• Time to Go Fishing!
• 'Meyer' Lemon and C-35 Citrange Rootstock
• Are Hops a Serious Option for a Crop in San Diego County?

• The Spanish Avocado Industry
• Strategizing for Water Cutbacks - Avocado and Citrus
• California Agricultural Production Statistics
• Maintaining the Citrus Orchard with a Reduced Irrigation Allotment
• The 2014 Drought in California

• Rehabilitating Frost Damages Citrus and Avocado
• Advances in mitigation of alternate bearing of olive: vegetative growth response to plant growth regulators
• Fertigation - Measuring Uniformity
• Olive Fly Update

In this issue:

• Olive Tree Phenology
• Training and Pruning of Cherimoya
• High Density Avocado Installation:  Use a quick cost study to make a decision
• Volatile Organic Compound (VOC) Emissions from Pesticides

In this Issue:

• Cultural Practices to Reduce Pest and Disease in Avocado and Citrus
• Polyphagous Shot Hole Borer in California
• Electronic "sniffer" for Detecting HLB
• Important Information Sources related to Fire Management and Protection
• Be Kill in Oregon - A Reminder of Pesticide Use

In this issue:

• Costs of Orchard Establishment and Production Summary for Avocados in California
• Huanglongbing Conference, Florida
• Going Out of Business in the Citrus Business -- Doing it the Right Way
• The Avocado:  Botany, Production and Used, 2nd Edition
• Winter Irrigation
• Update from Israel on the Polyphagous Shot Hole Borer and Fusarium symbiont 

• Asian Citrus Psyllid Quarantines
• Decline of Oranges and Mandarins
• Mitigation of Alternate Bearing in Olive
• Alternate Bearing in Mandarin

This issue contains the following articles:

• Simazine Degradation in CA Citrus Orchards
• Lime-induced Iron Chlorosis
• Avocado Trunk Cankers
• Asphyxiation
• Tree Wraps
• Stem and Leaf Blight

This issue of Topics in Subtropics contains the following articles:

• Quarantine for Huanglongbing Declared in Hacienda Heights Section of Los Angeles County
• An Outline of Management Options for HLB in Florida
• Avocado Farming with High Priced Water
• Soil Moisture Sensors

Please see attached blurb regarding promising research in the fight against the ACP-HLB pest disease complex.

This issue of Topics in Subtropics contains the following articles:

• Vertebrate Damage
• Chemical Thinning of Olives
• Tips on Producing the Earliest Early Citrus in the San Joaquin Valley
• Herbicide Registration Chart
• Resource and Market Information for Enterprise Selection

• Definitions
• Gauging Wind Speed

• How Frosts and Freezes Occur
• General Cultural Practices
• Managing Irrigation Water for Tree Protection
• Use of Wind Machines
• Ice-nucleating Bacteria

• Organic Herbicides:  Do they work?
• Snake Oil:  Horticultural Myths and Legends
• Success Story before There Is a Problem

• An update on the threat of Asian citrus psyllid and Huanglongbing for citrus
• The Search for Salinity Tolerance in Avocado: An Update on a Frozen Rootstock Trial
• Activator Spray Adjuvant Selection: Crop Spraying
• Conservation Programs Deadline Set for 2011 Funding: NRCS-Natural Resources Conservation Services News Release

• NRCS Announces Initiative to Improve Agricultural Energy Efficiency
• Periwinkle Provides Ammunition In The War On Citrus Plague
• Do we really need Scientific Irrigation Scheduling?
• Farmers Should Make A Skin Check a Priority
• Feeding Habits of California Ground Squirrels and their Role in Management
• Squirrel Calendar - 'English
• Squirrel Calendar - Spanish

• Microirrigation, Fertilizers and Clogging
• Chemical Treatment to Prevent System Clogging
• Cultural Practices to Reduce Pest and Disease in Avocado and Citrus
• Larurel Wilt Update
• The Parent Washington navel orange tree--Part 2. Its decline and recovery

• The state of Dothiorella Canker on Avocado in California
• The Parent Washington navel orange tree - It's first yearsvChester N Roistacher Retired Citrus Virologist, University of California, Riverside
• Mechanical Harvesting of California Table and Oil Olives

• 'Valentine,' A Recently Released Anthocyanin-pigmented Pummelo Hybrid Developed at the University of California Riverside
• The University of California-Riverside Citrus Variety Collection and Citrus Clonal Protection Program Websites Provide Information, Photographs, Fruid Quality Data and More
• Water Infiltration Problems
• Attention San Joaquin Valley Citrus Growers: What Do You Plan to Do If It Comes For You?

• Ag Waivers for San Diego County
• Spray Adjuvants; what's in a Name?
• Strategizing for Water Cutbacks - Is there a Logical Method?

• Avocado Research in Ventura County
• Laurel Wilt Disease Conference and Tour in Florida and Georgia
• Managing Insecticide Resistance will be Key to the Future of Effective Citrus Pest Management
• Smart Sprayers Make Sense

• Dothiorella Leaf and Stem Blight
• Irrigation Stress and Early-Navel Fruit Maturity

• New Registration for the Biocontrol Plantshield HC Against Hyphoderma Gummosis of Citrus
• Atmometers for Irrigation Management
• Asian Citrus Psyllid has Arrived in San Diego County

• Evaluation of Insecticides for Citrus Thrips Control, Using Blueberries as a Crop Surrogate
• The Silver Mite Workgroup
• Just Because Spring is a Good Time to Prune Navel Orange Dosesn't Mean You Should
• Brevipalpus Mites and Citrus Leprosis Virus Disease

• Grower Cooperators Deserve Recognition for Service to Their Industries
• Citrus Leaf Miner Update
• Stubborn Disease of Citrus in California
• New Avocado Publication

• Leaf Analysis
• Citrus Leafminer Update
• Are all Phosphorous Products the Same
• Financial Statements and Ratios

• Update on Lychee and Longan Fild Trials and Plantings in Southern California
• Loopers in Avocados--A Note from San Diego County
• The 2007 Citrus Tristeza Virus Situation at the University of California Lindcove Research and Extension Center
• Errata: Honey Bees in California

• An Introduction to the Problem of Honey Bees and Mandarins
• Birds do it; Bees do it, Even Citrus with Seeds do (did) it. Part1-The Biology Behind Seedlessness in Mandarins
• Honey Bees in California

• Boron is High in Many Southern San Joaquin Valley Citrus Trees
• Armillaria Root Rot
• Soil Test Kits
• Using Evapotranspiration (ETo) for Scheduling Irrigations-An Improvement on "Guessing"
• Subtropical Crops Program Coverage in Riverside County

• The Positive Points Systems for Citrus: What is it and Why Should a Grower Get Involved
• Getting Horseweed and Hairy Fleabane Back Under Control in Central California
• A Comparison of the New "Sequoia" Fig Cultivar
• A Celebration of Agricultural Research&Extension

• Citrus Research Growers' Seminars 2006
• Dry Rot in Citrus
• Earwigs Flying Under the Radar of Many Citrus Pest Control Advisors
• New Tools Available for Spider Mite Management in 2006
• Product Testing

• Liquid-Sugar Ant Bait Stations are Nearing Registration for Agriculture
• Huanglongbing, Citrus Greening: Preparing For the Future
• Citrus Herbicide Charts&Tables Kurt Hembree/Farm Advisor, Fresno County
• Bear Citrus Thrips Resistance in Mind When Deciding Whether&How to Treat in 2006

• Management of Banks Grass Mite in Dates
• UC Riverside Citrus Variety Collection
• Diapres Root Weevil Infestations Found in Southern California a Recent Exotic Pest Invasion
• Diaprepes Quarantine Details

• Little Evidence to Support the Use of Foliar Applied Nutrients in Avocado
• Web Sites That Can Help Your Production
• Cutoff Deadline Set for Landowners Applying for 2006 EQIP Funds
• Intensive Training Course on "How to Export Your Food or Agricultural Product"
• Cal/OSHA Heat Advisory

• Citrus Leafminer, New Pest for Southern California
• Ag Waivers
• Super-Early--Season Satsuma Mandarins for San Joaquin Valley and California
• Protecting Workers From Heat Strees

• Phosphorous Acid in Avocado Production Should it be a Cultural Recommendation
• Emergency Farm Loans
• New 24C Registration of Isopropyl Ester 2,4-D (Alco Citrus Fix) for Fruit Size Increase of Mandarins and Mandarin Hybrids in California
• Asphyxiation
• Dweet Mottle Virus and Citrus Leaf Blotch Virus

• Upcoming Meetings
• Avocado Lace Bug
• The First Rule of Growing Citrus in the San Joaquin Valley: Location, Location, Location
• The Inland Empire Small Farm Inititative: Promoting Small Farm and Hispanic Economic Development in Riverside and San Bernardino Counties
• Cellulase Production by Various Sources of Mulch

• Upcoming Meetings
• Deficit Irrigation
• Topworking or Replanting-A Grower's Perspective

• Upcoming Meetings
• Mechanical Pruning and Harvesting Olives
• One, One Hundred, One Thousand
• Making Sense of Soil Moisture Checking and Sensors
• Think Twice Before Planting Clementine and W.Murcott Afourer Mandarins

• UC Publications&Meetings
• Verteberate Pests Causing Damage in Citrus
• After the Fire in the Avocado Grove--Replant or Sucker Graft
• Compatibility/Seediness Among Clementine Mandarins....
• Irrigation Scheduling
• An Update of Agricultural Waivers in CA--Water Quality Programs for Irrigated Agriculture
• Integrating Admire Treatments for GWSS with Citrus IPM in the San Joaquin Valley

• Irrigation on Slopes
• Pollination & Seeding of Clementines
• Weed Control Practices and Costs
• Farm Mapping
• Calculating Value of Tree Loss
• Nick Sakovich Retires
• USDA Emergency Loans for Fire Losses
• Educational Opportunities

• Citrus Fall Tissue Sampling
• Invasive species
• Avocado Planting Holes
• Production Quiz
• Puncture Vine
• Avocado Rootstocks
• Charlie Coggins Scholarship Fund

• Who are We
• Citrus Leafminer
• Medjool Dates
• Pruning Avocado
• Dry Root Rot of Citrus
• Upcoming Meetings
• UC Farm Advisor Listing

• The Mexican Fruit Fly Quarantine...A Caution for All Growers in California
• Lychee and Longan--New Crops for California
• Bees and Mandarins--The New Range War
• Resource and Market Information for Enterprise Selection
• A Message from Dr. France Cordova, Chancellor at UC Riverside