Angular leaf spot (or as some insiders refer to it, "ALS") caused by the bacterial pathogen Xanthomonas fragariae, has been showing up a bit more than expected this year in several strawberry varieties, including Cabrillo and Petaluma.
I'd like to demonstrate several descriptions of this disease from the UC IPM guidelines for strawberry with pictures just taken this morning on a field of Cabrillo variety strawberry. Picture 1 shows the water soaked spots on the leaves which as a matter of fact when seen in the low angle of light in the early morning show the angular formation of infection bounded by the venation of the leaf. Further, picture 2 shows the viscous exudates (reminiscent of pus) matched to these areas on the underside of the leaf. These exudates tend to be moist and lustrous in the morning, and dry down to a more scaly appearance as the day progresses.
These exudates come from the breakdown of the plant cell walls that this pathogen engenders, and the exudates are of course also filled with Xanthomonas bacteria cells. Given the size and proliferation of these disease propagule filled exudates, it doesn't take much imagination to realize how easily it is to move disease around, especially via rain and overhead irrigation.
The Guidelines state that cool, moist days (think rain) followed by cold nights near freezing are what favor this disease, so hopefully by now we are through most of the woods on this issue for this year.
UC Office of the President is inviting employees to comment on a proposed new Presidential Policy on Export Controls.
The proposed policy seeks to provide a framework for all University locations to develop further local export-control compliance programs that satisfy federal legal requirements while allowing each location the flexibility to develop its own specific requirements and practices. Compliance with export controls requires the cooperation and is the responsibility of various offices and individuals across the University system. The proposed policy identifies some of those offices and individuals and describes some of their responsibilities to ensure that the University follows export-control laws and regulations.
If you have any questions or if you wish to comment, please contact Lourdes DeMattos, Research Policy Analysis and Coordination, at ECPolicyComments@ucop.edu, no later than June 8, 2017. Please indicate "Export Controls Policy Comments" in the subject line.
The policy draft is posted at http://ucanr.edu/sites/anrstaff/files/258760.pdf.
View or leave comments for ANR Leadership at http://ucanr.edu/sites/ANRUpdate/Comments.
This announcement is also posted and archived on the ANR Update pages.
Many states have a designated state bird, flower, fossil, mineral, etc. In California, the state bird is the California Valley Quail, the state flower is the Golden Poppy, the state fossil is the Sabertoothed Cat, and the state mineral is Native Gold. The state rock is Serpentine which contains chrysolite asbestos which is a carcinogen. It's a beautiful rock, though.
The state soil is the San Joaquin series. The series concept is that a given soil has certain properties like pH, depth, color, texture, etc. that distinguishes it from other “soils” or series. So wherever this soil is found it is given the same name. San Joaquin series is a soil that is found primarily along the foothills of the Sierras in the Central Valley. The name comes from where it is first described, in this case, San Joaquin, but it is found in other places. Yolo series is named after a soil on the campus at UC Davis in Yolo county, but it is also found in San Diego county, and in other states.
A description of the state soil can be found at the link below, as well as the state soils in other states:
Soils can be highly variable depending on the context in which they are found. Going to flat old Kansas which is actually flatter than a pancake (http://www.usu.edu/geo/geomorph/kansas.html), the variability from spot to spot across miles can be minimal. But going to a place like Ventura, Santa Barbara, San Luis Obispo Counties of the Sierra foothills, you can't step on the same soil twice. That's because of the terrain and landforms. Where there is natural erosion (yes, it doesn't take humans to cause erosion) or accelerated erosion (this is where humans have often changed the landscape with roads, houses, removing ground cover) soil gets moved around and deposited in different positions and over time forms different soils with different properties. On large tracts of land that have not been altered much, such as avocado orchards, the naturally formed soils can be seen. In a housing tract where soil has been moved around to level and compact housing pads, it is often hard to find a natural soil because it is so highly disturbed. The soil can have been moved from one end of a 100 acres tract to the other with big equipment. It's all one big homogenous mix down to several feet at times depending on the slope.
In many cases, it is still possible to see the natural soils and knowing their series classification, it's possible to learn some of the properties and some of the problems that will be encountered when working with them. Knowing the pH prior to working it means that it could be adjusted before planting. It's a whole lot easier to adjust before planting than when the plants are in the ground.
You can see the soils in your area by going to the USDA-NRCS (Natural Resources Conservation Service) website - https://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm - and typing in the area code to find the soil at a given site. It probably isn't the state soil series, but it's your soil series.
For a great text on understanding soils, check out Soils: An Introduction by Michael Singer and Don Munns.
I am pleased to announce that Mark Bell has accepted the Vice Provost–Statewide Programs/Strategic Initiatives position. Mark, who has served as director of the UC Davis International Learning Center since 2007, will join UC ANR on May 1 in the offices at 2801 Second Street in Davis.
UC ANR can benefit from his skills and experience in leveraging research-extension linkages, adult education and information technology for agricultural development.Prior to joining UC Davis, Mark, who speaks Spanish, worked for nine years at the International Maize and Wheat Improvement Center (CIMMYT) in Mexico and 11 years at the International Rice Research Institute (IRRI) in the Philippines.
At IRRI, he led development of the Rice Knowledge Bank – the world's major repository for rice-oriented training and extension materials aimed to help developing countries. He is currently leading development of Ag Extension, eAfghan Ag and e-China Appleat UC Davis International Learning Center.
As vice provost, he will serve on the UC ANR Program Council and collaborate closely with the Vice Provost of Cooperative Extension and the Director of the Research and Extension Center System.
Mark has a Ph.D. in soil science and bachelor's degree in agricultural sciences from the University of Queensland in Australia and a master's degree in soil science from the University of Reading, U.K.
We must thank the search committee members for their unflagging efforts to find an extraordinary leader who possesses the unique set of skills needed to help us build on UC ANR's current successes and direct our programs toward the needs of California's future.
I know many of you have already met Mark Bell and collaborated on projects with him. Understanding the breadth of work that we do, the wide array of agencies and organizations that we partner with and the diverse clientele that we serve will help Mark quickly get up to speed.
Please join me in congratulating Mark on his new position and welcoming him to UC ANR.
View or leave comments for ANR Leadership at http://ucanr.edu/sites/ANRUpdate/Comments.
This announcement is also posted and archived on the ANR Update pages
Enough is enough on lygus. Your colleagues Shimat Joseph, Pete Goodell and Mark Bolda, along with some serious assistance from the UC ANR support unit have assembled the best and brightest minds in the world on lygus and other heteropteran pests right here at your door this coming April.
If I were a grower or PCA serious about managing lygus and other plant bug pests, I wouldn't miss this event for the world, especially the third day which is oriented towards real world applications.
UC ANR Cooperative Extension will be offering a multi-topic Heteroptera insect group Symposium on April 18-19, 2017, followed by a Heteroptera Workshop and local tour on April 20. Following the International Lygus Symposia held in Ottawa Canada, Monterey CA, and Scottsdale AZ, the program will provide participants with the latest information and research from international experts on Lygus, Plant and Stinkbugs. Informational sessions, including keynote presentations from Dr. Tracy C Leskey, Director USDA Agricultural Research Service, and Dr. Kim Helmer, Research Entomologist USDA Agricultural Research Service, will cover topics such as biology and ecology of the group, management of pest species, advances in chemical ecology, and focused crop seminars.
The program will take place at the Embassy Suites Monterey Bay-Seaside at 1441 Canyon Del Rey in Seaside. Registration is currently open and offered at a three-day combination package or a single-day workshop option. Discounted early registration ends April 1, 2017. Register at http://ucanr.edu/sites/2017bugsymposium/Registration/.
Visit our website to see the latest information and to sign up to receive email notices. http://ucanr.edu/sites/2017bugsymposium/.
If you have any questions, please contact Kellie 530-750-1259 firstname.lastname@example.org