Native to Asia, the Asian citrus psyllid, Diaphorina ciri, was first detected in the United States in June 1998 in Palm Beach County, Florida. Since then, ACP has invaded all other US citrus areas. It has been detected in 26 of California's 58 counties. Infected psyllids can transmit the bacterium Candidatus Liberibacter asiaticus, which causes the fatal citrus disease Huanglongbing (HLB). HLB is currently the most devastating threat to the worldwide citrus industry. A citrus tree infected with HLB may not exhibit any symptoms for two years, and will usually die within five years. UC ANR IPM states that there is no known cure. “The only way to protect trees is to prevent spread of the HLB pathogen in the first place, by controlling psyllid populations and removing and destroying any infected trees.”
The California Department of Food and Agriculture (CDFA) has set up extensive monitoring and quarantine programs to track and try to slow the spread of the insect and disease. Currently, both residential and commercial sites that have citrus are monitored by checking yellow sticky traps. Psyllid and leaf samples are being tested for the presence of HLB.
If ACP is detected in an area, farmers must resort to regular spray programs to try to control the ACP population. This practice negatively impacts efforts to have a citrus crop grown with IPM strategies that rely on beneficial insects. In a ground-breaking discovery encompassing six years of research, an international team of scientists led by UC Davis chemical ecologist Walter Leal announced they've identified the sex pheromone of ACP. This pheromone can be used to attract more ACP to sticky traps. “Having a [pheromone] lure to dramatically improve captures of this psyllid with the conventional sticky traps is a major progress toward [developing] integrated pest management [strategies],” said Professor Jose Robert Parra of the University of Sao Paulo. Read more.
- Author: Cheryl Reynolds
‘Tis the season for baking lots of tasty treats. Breads, cookies, cakes, and candy are just a few that come to mind. What makes many of these treats so tasty is the addition of almonds or walnuts to the list of ingredients.
In California, we are lucky to be at the center of almond and walnut production. According to the California Department of Food and Agriculture's (CDFA's) latest Agricultural Statistics Review, more than 99% of the almonds and walnuts produced in the United States are grown in California.
Almond and walnut growers work tirelessly to supply enough nuts to not only satisfy domestic demand, but also for export. Worldwide, almonds rank as the largest specialty crop export. California is the top almond producer in the world, accounting for about 80% of all almonds grown. For walnuts, California ranks as the second largest producer in the world. To keep up with this demand, almond and walnut growers must be constantly aware of pests, diseases, and abiotic problems that can affect the tree and growing nuts.
The University of California Statewide Integrated Pest Management Program (UC IPM) has recently published revised Pest Management Guidelines for almonds and walnuts, helping growers prevent and manage pest problems with the most up-to-date information.
Revisions in the Almond Pest Management Guidelines include:
- A new section on bacterial spot, a new disease of almond in California found in the Sacramento and northern San Joaquin valleys
- A renamed section on fruit russeting, revised from the old powdery mildew section
- Significant revisions made to the management section of navel orangeworm, one of the major pests attacking California almonds
- Improvements on how to do dormant spur sampling section with easier-to-understand information on monitoring and thresholds
Revisions in the Walnut Pest Management Guidelines include:
- Updated information on the association between walnut twig beetle and thousand cankers disease
- New sections for Botryosphaeria and Phomopsis cankers, branch wilt, and paradox canker
- Significant changes to the walnut husk fly management section
Both the almond and walnut revised Pest Management Guidelines also include updated information on fungicide efficacy, weed management, and vertebrate management.
Authored by University of California specialists and advisors, the Pest Management Guidelines are UC's official guidelines for monitoring and managing pests in California crops. For more information on pest management in these or other crops, visit the UC IPM website.
This Giving Tuesday, why not donate to KARE? Donations to KARE will be used to help expand our local programs, including research, extension and outreach. KARE is part of the REC system, which is a strong, vibrant organization of research and education academics supported by extraordinary research management capacity to conduct agriculture, natural resource and human resource programs that enable the delivery of the highest quality science to promote healthy citizens, thriving communities, and best practices to protect our agricultural and natural systems.
“Building on past efforts by Valley growers to reduce open burning of agricultural waste, the Valley Air District is bringing together Valley growers, researchers, experts, biomass industry representatives, scientists, representatives from new and developing technology vendors, and other Valley stakeholders for a two day summit aimed at advancing new and existing cost-effective clean alternatives to open burning of agricultural waste.” Source: http://www.valleyair.org/cvsummit/.
Please go to the above link to explore the agenda, topics, and presentations.
Malcolm Media is providing three Ag expos this month: A tree and vine expo in Turlock was presented today; a grape expo will be in Sonoma on November 10, 2017, and a grape, nut and tree fruit expo will be at the Fresno fairgrounds on November 14, 2017. To pre-register, please use the above link.
This blog article is on the November 14th expo in Fresno. The Grape, Nut & Tree Fruit Expo is provided every year at the BIG Fresno Fair grounds. Held in the heart of grape, nut and tree fruit growing areas, the expo is sponsored by the Central Valley wine, table, and raisin grape, tree fruit and nut industries. UC ANR scientists involved with applied research and extension for these cropping systems will provide presentations to the attendees.
The expo is free, and has free seminars that provide continuing education units approved by CDPR for CE/CCA licenses (1 hour of laws and regulations, and 4 hours of other), a free breakfast, a free lunch, and industry exhibits. It starts at 7:00 am and finishes at 2:00 pm. UC ANR speakers include:
- George Zhuang, Fresno County UCCE farm advisor in viticulture will present “Cropload Management on Young Pinot Grigio Vines”
- Kent Daane, UCCE specialist at Kearney Ag Research & Extension Center (KARE), specializing in entomology, will present “Update on Black Widow Control in Table Grapes”
- Kurt Hembree, Fresno County UCCE farm advisor in weed management will present “Herbicide use for Vineyard Weed Control” and “What's New in Tree & Vine Weed Management”
- Ashraf El-Kereamy, Kern County UCCE farm advisor in viticulture will present “Improving Productivity & Quality of Grapes”
- Kris Tollerup, Cooperative extension advisor at KARE, specializing in IPM, will present “Effective Ant Management to Minimize Damage at Harvest”
- Themis Michailides, Plant Pathologist at KARE, will present “Band Canker of Almond Becoming a Threat to New Plantings”
- Kevin Day, Tulare County UCCE Director and farm advisor in pomology, will present “Lowering Labor Costs with Pedestrian Orchards”