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California Avocado Commission Virtual Field Day, Sept. 17

On September 17th from 3:30pm – 5:00pm the California Avocado Commission will host a virtual field day concerning Avocado Branch Canker disease that will consist of two 30-minute presentations by Dr. Themis Michailides, University of California Kearney Agricultural Center and Dr. Liz Dann, University of Queensland, followed by a question-and-answer session. Registration for the virtual event is now open. Dr. …

New Targets for Huanglongbing Treatments

Scientists are closer to gaining the upper hand on a disease that has wiped out citrus orchards across the globe. New models of the bacterium linked to the disease reveal control methods that were previously unavailable. Metabolic models of organisms are like road maps of cities. “They show you all the biological processes, and how they work together,” said UC …

Barking Up the Right Tree: Canines Detect HLB

In September 2019, huanglongbing—also known as HLB or citrus greening—was detected in residential citrus trees located in Ventura County, in southern California (and just recently, the first HLB carrying Asian Citrus Psyllid was detected in a commercial CA citrus grove). The disease, which has no known cure, is caused by a bacterium that devastates citrus plants and is transmitted by …

CLas-positive Asian Citrus Psyllid Found in Riverside Commercial Grove

An Asian citrus psyllid (ACP) sample – confirmed positive for Candidatus Liberibacter asiaticus (CLas) the bacteria that causes Huanglongbing (HLB) – was collected from a commercial citrus grove in the Woodcrest area of Riverside County. Confirmed by Citrus Research Board’s Jerry Dimitman Laboratory, this single adult psyllid is the first CLas-positive ACP found in a commercial citrus grove in California. While a …

China Market Opportunities for California Nectarines

On March 4, 2020, China announced market access for fresh U.S. nectarines as part of the U.S.-China Economic and Trade Agreement (ETA). This report briefly mentions the market access conditions for U.S. nectarines, discusses several key factors of China’s nectarine market (including import competition), and offers market-entry recommendations to consider when exporting fresh U.S. nectarines to China. Product Description & Access Overview On March 4, 2020, in …

California Prune Growers Suffer the Brunt

California prune growers forced economically to make a 23% reduction in crop deliveries have also suffered a 28% reduction in price. This hardship comes in spite of a number of positive factors for the industry including $50 million in USDA purchases of prunes and positive results from trade mitigation offsets and industry promotion efforts in Japan and elsewhere. Growers reviewed …

UCCE Tulare County Dried Plum Program Assists Efforts for Detection of Invasive Beetle

Following a tip generated by citizen scientists in the Porterville/Tulare area, UC ANR researchers have installed traps to determine the potential for Velvet longhorned beetle, Trichoferus campestris (Coleoptera: Cerambycidae), introduction to the southern San Joaquin Valley. The beetle, also called Mulberry longhorn beetle, is native to Asia and Russia, but now has an extended geographic range across Europe and North America.  The …

NEW NITROGEN MANAGEMENT RESOURCE AVAILABLE FOR CITRUS & AVOCADO

To address nitrate pollution of groundwater, the Central Valley Regional Water Quality Control Board has initiated a regulatory program requiring growers to utilize nitrogen management practices that mitigate nitrate loading. Because nitrogen plays such a critical role in in the growth and development of avocado trees — and because it can be difficult to ensure trees are receiving the optimal amount …

FIRE RECOVERY GRANTS AVAILABLE FOR SO CA GROWERS

Erosion damage caused by the 2018 – 2020 California wildfires can result in discharges of sediment, metals, nutrients and other pollutants that threaten streams, aquatic life and public health. In an effort to mitigate the effects of erosion caused by the fires in Ventura and Los Angeles Counties, the Post Fire Recovery Project will allocate $320,000 worth of reimbursable supplies …

UC Riverside Discovers First Effective Treatment for Citrus-Destroying Disease

UC Riverside scientists have found the first substance capable of controlling Citrus Greening Disease, which has devastated citrus farms in Florida and also threatens California. The new treatment effectively kills the bacterium causing the disease with a naturally occurring molecule found in wild citrus relatives. This molecule, an antimicrobial peptide, offers numerous advantages over the antibiotics currently used to treat the …

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