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Pest/Disease Management

Managing Aphids in California Prune Orchards

By Sudan Gyawaly, UCCE Northern Sacramento Valley IPM Advisor — ‘Leaf curl plum aphid’ and ‘mealy plum aphid’ are the key pests of prune orchards in the northern Sacramento Valley. Both aphid species survive the winter in the orchard at egg stage near the base of buds. Once hatched, around bloom time, they vigorously feed on the young foliage and build up …

Victoria Hornbaker Moves from Director of Citrus Pest & Disease Prevention Division to Plant Health and Pest Prevention Services Division

The California Department of Food and Agriculture’s (CDFA) Citrus Pest and Disease Prevention Division (CPDPD) has announced that as of May 14, 2024, Victoria Hornbaker, former director of the CPDPD, will transition to her new role as the director of the CDFA’s Plant Health and Pest Prevention Services (PHPPS) Division. David Gutierrez, branch chief of the CPDPD, will serve as …

Rising Fruit Fly Populations Concern California Growers

Fruit fly populations spiked last season and brought multiple species, compounding the damage to vineyards and orchards following Hurricane Hilary.  This is a continued concern for California fruit growers moving into the 2024 season with limited pest management tools available. Watch this brief California Ag Network interview with Adam Borchard from the California Fresh Fruit Association to learn more.

Root Inhibitor Herbicide Injury in Tomatoes

Root inhibitor herbicides such as Trifluralin (Treflan HFP) and Pendimethalin (ProwlH2O) are soil applied and preplant- incorporated and used for control of many annual grasses and broadleaves in processing tomatoes in the Central Valley. This year, I have seen symptoms from these root inhibiting herbicide injury in a processing tomato field and the damage was quite uniform and widespread in …

HLB Funding Prioritized in Farm Bill Proposal

California Citrus Mutual (CCM) commends Chairwoman Stabenow of the Senate Agriculture Committee and Chairman Glenn Thompson from the House Agriculture Committee for prioritizing the citrus industry’s fight against Huanglongbing (HLB) in each of their frameworks for the 2024 Farm Bill. Each Chair’s framework continues support of the Emergency Citrus Disease Research and Extension Program at $25 million per year for …

USDA to Protect Hundreds of Crops from Invasive Fruit Flies

The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) has released “Fruit Fly Exclusion and Detection Program Fiscal Years 2024-2028 Strategy.” APHIS worked with members of the National Plant Board to develop a unified roadmap for USDA and its partners to protect American agriculture from the threat of invasive fruit flies and measure our progress along the …

California Citrus Breeding Program Expanding with Congressional Support

Today, Presidents of California Citrus Mutual (CCM) and Citrus Research Board (CRB) issued statements applauding Congressional leaders for recently approving additional funds for the new citrus breeding program in Parlier, California. Congress is allocating an additional $500,000 in federal funding on top of the $1 million granted last year to expand the program into California. The program will now receive $1.5 …

Update to ACP and HLB Bulk Citrus Movement Requirements

Effective March 12, 2024, the Citrus Pest and Disease Prevention Division (CPDPD) has updated the requirements for moving bulk citrus fruit from an Asian citrus psyllid (ACP) quarantine zone to a packer/processor in a Huanglongbing (HLB) quarantine area. Citrus fruit may now be moved from any ACP quarantine zone to an HLB quarantine area for packing or processing without a mitigation, such as a …

Fungicide Evaluation for Alternaria Head Rot (Pin Rot) of Broccoli

Broccoli head rot, also known as pin rot, can cause significant problems, especially in fall broccoli production in Salinas Valley. Two types of head rot are affecting broccoli, including bacterial head rot and Alternaria head rot (Koike 2010). Differences between those two types can be seen at: https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=3861. Here we focus on the Alternaria head rot, caused by the fungi Alternaria spp. Symptoms. All …

UCCE Tulare County Assists Pathologists in Survey for Decay Fungus in Prunes

Recently, extensive wood decay-related limb breakages have been reported in commercial prune orchards in the Sacramento Valley, adversely affecting fruit production and limiting the value of salable firewood upon orchard removal. Several fungal genera such as Phellinus, Rhodoformes, Schizophyllum, Sterum, Trametes, Ceriporia, and Perenoporia have been recognized for wood-decaying activity on California prunes.  Phellinus pomaceus has been the primary organism associated with prune decay symptoms in the Sacramento Valley; however, …

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