Category: Pest/Disease Management
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Managing Walnut Husk Fly in the Orchard
Walnut growers should start monitoring for walnut husk fly in May. Watch this video with emeritus UCCE IPM Specialist Bob Van Steenwyk as he provides timely step by step directions on how to monitor and manage this pest. Read more about orchard pest management in Pacific Nut Producer Magazine.Please thank this video’s sponsor Trece for their industry support. -
CIDETRAK® NOW MESO™ – A Testament to PERFORMANCE
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“This is our second year using CIDETRAK® NOW MESO™ in our Almonds and Pistachios, and I’m very satisfied with the results. We applied CIDETRAK on roughly 800 acres of Almonds and 2,000 acres of Pistachios. It gives me peace of mind knowing that this product is on 24/7 and continually releases pheromone season long.
Since adding CIDETRAK to our NOW management program, we’ve seen a consistent reduction in injury year over year. NOW injury has continually been suppressed below 1%. The product is quick and easy to apply. It’s also very convenient that each CIDETRAK box turns into a carrying case, making the application process much easier.
Hands down, this is an extremely effective tool in managing NOW in our nut crops. I highly recommend CIDETRAK to anyone who would like to see a product that delivers consistent results and assurance that their orchard will be protected.”
About Joe:
Joe grew up in a family of farmers. Since the age of 8, he has worked in Agriculture and has learned an array of skills that he’s been able to apply throughout his career. Joe graduated from Cal Poly in 2006, and became the Research Director at DB Specialty Farms working in Strawberries. In 2013, he took a position with Maricopa Orchards and is currently their Director of Agronomy. Joe resides in Clovis, CA with his wife and four kids.
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Almond Board Joins Group to Speed CA’s Shift to Safer Pest Management
Yesterday, the California Department of Pesticide Regulation and California Department of Food and Agriculture launched a broad new work group to accelerate the systemwide adoption of safer, sustainable pest control practices.
The 25-member Sustainable Pest Management Work Group includes farmers, community members, university researchers and representatives from commodity groups and the pesticide industry. They are charged with identifying pathways to minimize the use of toxic pesticides and expand the use of integrated pest management practices; better protect public and environmental health; and engage, educate and promote collaboration to achieve these goals.
“Transitioning away from toxic pesticides requires us to speed up the development of effective alternatives,” said CalEPA Secretary Jared Blumenfeld. “By giving our farmers a suite of integrated pest management tools, we can better protect farmworkers and some of California’s most vulnerable communities. This dynamic task force will give us the roadmap to achieve this bold vision.”
“California agriculture is recognized not only for its quality and quantity, but also for the sustainable, innovative, forward-thinking way it is grown,” said CDFA Secretary Karen Ross. “Our farmers have been leaders in adopting integrated pest management and partnering with universities and technical assistance providers to meet our high standards for food, environmental and worker safety. This work group represents a broad array of perspectives to inform the next decade of research and development investment and new partnerships to continue the production of nutritious, delicious food and high quality agricultural products with the least impact to our surrounding communities.”
Funded in last year’s budget, the group’s work will build upon the recommendations of the Alternatives to Chlorpyrifos Work Group whose 2020 report identified alternatives to the hazardous insecticide and outlined actions to further support agriculture and the health of local communities, farmworkers and the environment. A new status update details additional actions DPR has taken based on the 2020 report, and how DPR and CDFA are working together to provide additional funding to the University of California and California State University to expand integrated pest management research and education. California prohibited virtually all uses of chlorpyrifos as of Dec. 31, 2020.
The Sustainable Pest Management Work Group is part of the State’s larger commitment to accelerating the transition away from hazardous pesticides. To support the move, Governor Newsom is proposing to fund additional support for the transition by replacing the current flat-fee mill assessment on pesticide sales with a new risk-based tiered mill assessment, where higher toxicity pesticides are assessed a higher fee.
The members of the Sustainable Pest Management Work Group include:
- Jenny Broome, Driscoll’s
- Don Cameron, Terranova Ranch
- Casey Creamer, California Citrus Mutual
- Jim Farrar, UC Integrated Pest Management (IPM)
- Chris Geiger, City of San Francisco
- Kim Harley, UC Berkeley
- Lisa Herbert, Sutter County Agricultural Commissioner
- Nina Ichikawa, Berkeley Food Institute
- Dan Kaiser, Environmental Defense Fund
- Susan Kegley, Pesticide Research Institute
- Margaret Lloyd, UC Extension – small farm advisor
- Suguet Lopez, Líderes Campesinas
- Gabriele Ludwig, Almond Board of California
- Pam Marrone, Chestnut Bio Advisors, Formerly Marrone Bio Innovations
- Nayamin Martinez, Central California Environmental Justice Network
- John McKeon, Taylor Farms
- Cliff Ohmart, Pest Control Advisor (PCA)
- Scott Park, Park Farms
- Margaret Reeves, Pesticide Action Network
- Taylor Roschen, California Farm Bureau
- Sarah Ryan, Environmental Director Big Valley Band of Pomo Indians
- Daniel Sonke, Campbell Soup Company
- Paul Walgenbach, Bayer
- Ron Whitehurst, Pest Control Advisor (PCA)
- Houston Wilson, UC Organic Agriculture Institute
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Leaffooted Bug Species May be Changing
Almond Board of California — Insect pest management in almond and pistachio orchards largely focuses on reducing damage from navel orangeworm (NOW). Yet, after navel orangeworm, large bugs such as leaffooted bugs (LFBs) and stinkbugs are considered to be among the most damaging insects.
Leaffooted bug species of particular concern in the past have included Leptoglossus clypealis, Leptoglossus occidentalis, and Leptoglossus zonatus. Leptoglossus clypealis is occasionally noted to be numerous: In 2013, L. clypealis was a particularly abundant LFB in orchards; however, since that time, L. clypealis seems to be less common than another LFB, L. zonatus.
Recognizing and understanding the differences between these two LFB is key to effective management.
L. clypealis is shown on the left and L. zonatus on the right. Photo courtesy of Dr. Joyce.
L. zonatus is a larger LFB than L. clypealis and has longer mouthparts that allow it to feed on developing fruits longer into the growing season. Prior to 2013, L. zonatusdid not appear regularly in almonds in California, and it was not noted in University of California Integrated Pest Management manuals as being a pest of almonds – while this species was present in California, perhaps it was not particularly numerous. Since 2013, L. zonatus has frequently been observed in almonds during the growing season and at harvest, and now seems to occur more regularly in orchards than L. clypealis. It may be that the larger LFB L. zonatus is displacing L. clypealis.
From 2014-2016, researchers identified LFB collections in almond and pistachio orchards from Chico to Bakersfield as consisting of two species: L. clypealis and L. zonatus. A 2017 study by Dr. Andrea Joyce, an entomologist at the University of California, Merced, investigated population genetics of these two species and found that L. clypealiscollections have high genetic diversity and many genetic types (haplotypes). This suggests that these L. clypealiscollections from the Central Valley are within this insect’s native range. However, the insect collections of the other species, L. zonatus, consisted of two genetically divergent types, or strains. One L. zonatus strain was widespread, and occurred through the Central Valley from Chico to Bakersfield, and the second genetic type occurred in the central and southern San Joaquin Valley. Work to geographically map out where the two genetic types of L. zonatus occur is ongoing.
The presence of two strains of L. zonatus is important for insect pest management. It is highly likely that each insect strain is susceptible to different parasitoids, predators and pathogens. Two insect strains can also vary in their response to insecticides, as well as their attraction to pheromone lures.
Currently, pheromone attractants are being developed for this LFB. It is vital to determine if the same pheromone blend will equally attract the two strains of L. zonatus. Dr. Joyce and colleagues will continue research on the two strains of L. zonatus this year, comparing their biological parameters, examining whether the two strains are cross attracted in lab bioassays, and if they cross mate in the field. The hope is that any pheromones and attractants developed for L. zonatus can be used to manage both strains of this species. A monitoring tool such as a pheromone trap for these insects would be particularly useful in a grower’s IPM toolbox.
Growers can support researchers in determining the distribution of the two strains by collecting any LFBs they identify or notifying Dr. Joyce when large numbers of LFBs are observed. Growers may email Dr. Andrea Joyce if they sight LFBs or have questions about this pest at ajoyce2@ucmerced.edu.
Note: Additional Almond Board-funded research is being conducted by Dr. Jocelyn Millar to identify pheromones and related attractants for the two major LFB pests in California nut crops. These tools could potentially be utilized for monitoring or control of these species. -
CIDETRAK® NOW MESO™ – Add this TOOL to your BELT
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“We are on year 2 with having CIDETRAK® NOW MESO™ in our orchard, and we are extremely pleased with the results. We’re treating 500 acres of Almonds and have seen a major reduction in NOW injury of up to 80%.
What makes CIDETRAK unique for us is the application flexibility. We do not have flat square orchard blocks that other products can be used on. We have staggered rows and imperfect orchard shapes, and this is where we can use multiple MESO source points to cover
Hanging the MESO’s was easy and even the local Trécé rep was willing to come out and show the team exactly how to apply the product.
CIDETRAK’s non-mechanical, non-failure simplicity combined with “beyond the harvest, field life” are other important aspects that drive us to continue with MESO.
CIDETRAK is a key tool in our toolbelt for controlling NOW. I recommend anyone thinking about their options for mating disruption products, to strongly consider CIDETRAK NOW.”
About Kevin:
Kevin grew up working in various aspects of Agriculture. At an early age he learned how to manage and operate a cattle ranch, as well as learned to manage large acreage of Almonds and Walnuts. After graduating from Chico State, he assumed the responsibility of managing Tehama Angus Ranch tree nut operations, and has been doing so ever since 2014. Kevin is the acting Orchard Manager for all of Tehama Angus Ranch tree nuts.
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Pacific Nut Producer March Issue

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[three_fifth_last]Contents of the March Issue:
Bad Luck, Good Luck & a Whole Lotta WorkSilva Family Legacy Continues Farming Walnuts
Bumble Bees Under the Endangered Species ActCF&G Commission Decision on Appealing Decision
Earl Bruck Gets Nut Grower of the Year AwardHazelnut Growers Gather Virtually for NGS Meeting
March Orchard TasksAlmonds, Hazelnuts, Pecans, Pistachios, Walnuts[/three_fifth_last]
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How to Prevent Crown Gall in the Orchard
Keep getting crown gall in the orchard? Watch this brief interview with Kern County Area Orchard Systems Advisor Mohammad Yaghmour as shares a few simple steps on how to effectively prevent this detrimental infection. Read more in Pacific Nut Producer and California Fresh Fruit Magazines.Please thank this video’s sponsor Trece for their industry support. -
How to Prevent Mold in Walnut
Did you see moldy walnuts in the orchard last season? Let’s not let that spoil the crop this year. Watch this brief interview with UC Plant Pathologist Themis Michailides as he briefly provides some key points on mold prevention and read more about it in Pacific Nut Producer Magazine…Please thank this video’s sponsor Trece for their industry support. -
Managing Phytophthora Diseases in Almond: Aerial, Root & Crown Rot
There are three ways Phytophthora can injure an almond tree. Watch this brief interview with Kern County Area Orchard Systems Advisor Mohammad Yaghmour as he helps growers identify and manage Aerial Phytophthora, Root & Crown Rot. Read more about it in Pacific Nut Producer Magazine.Please thank this video’s sponsor Trece for their industry support.
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A New Microscopic Almond Pest of Concern
Another pest in almonds? Just what we needed, right? Only this one you can’t see. Almond growers have been dealing with nematodes for a long time; however, the peach root knot nematode is new to California almond orchards. Watch this brief interview with UC Riverside Nematologist Andreas Westphal as he explains and read more about it in Pacific Nut Producer Magazine.
Please thank this video’s sponsor Trece for their industry support.




