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Pest/Disease Management

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, …

Citrus Greening (HLB) Impacting Brazilian Citrus Crop – Annual Report

The Brazilian orange crop for Marketing Year (MY) 2023/24 is forecast at 408 million 40.8-kg boxes (MBx) – standard reference, equivalent to 16.5 million metric tons (MMT), a decrease of 1.03 percent compared to the estimate of current crop MY 2022/23 (around 412.3 million boxes or 16.67 MMT), due to the incidence of greening, which has been affecting Brazil’s citrus belt. …

Filling in the Blanks About Rose Stem Girdler in Caneberries

Berry farmers are all too familiar with the rose stem girdler (RSG), an invasive insect from Eurasia that came to North America over a hundred years ago. They know that the copper-colored beetle has migrated to the Pacific Northwest. They know it attacks caneberries — blackberries and raspberries — sometimes ravaging up to 90% of a crop and forcing farmers …

Unlocking a Long-Hidden Mystery of a Virus That Attacks Ag Crops

When UC Davis distinguished professor Diane Ullman of the Department of Entomology and Nematology headed to France on a 2018-19 Fulbright grant to conduct research on tomato spotted wilt virus (TSWV) with her colleagues, she hoped it would lead to important discoveries to help combat plant viruses that attack agricultural crops. It did: their research revealed how TSWV (family Tospoviridae, order Bunyavirales) packages its …

Citrus Industry Guide to Fruit Fly Quarantines

Over the last several months, a variety of invasive fruit fly detections have triggered quarantines across numerous counties in California. These fruit fly species – including Mediterranean fruit fly, Mexican fruit fly, Oriental fruit fly, Tau fruit fly and Queensland fruit fly – are considered not established in California. Quarantines and their associated regulatory actions are implemented to stop the …

International Research Conference on Huanglongbing VII Coming March 2024

The California Citrus Research Board (CRB) and the Conference Steering Committee are pleased to share the International Research Conference on Huanglongbing VII (IRCHLB VII) will return March 26-29, 2024, to Riverside, California. The Conference is being produced by the CRB with the support of California’s citrus industry partners and guidance of the international Steering Committee. The California citrus industry is …

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