Subtropical Fruit Crops Research & Education
University of California
Subtropical Fruit Crops Research & Education

We are San Diego & Riverside County Farm Advisors

HLB - Potential Threat Near San Diego County

HLB detected in Riverside County: 

The Asian citrus psyllid is a tiny, mottled brown insect about the size of an aphid that poses a serious threat to all of California's varieties of citrus (e.g., oranges, grapefruit, lemons, and mandarins).


The insect is associated with the fatal citrus disease Huanglongbing (HLB), also called citrus greening disease. The psyllid takes the bacteria into its body when it feeds on bacteria-infected plants and spreads when a bacteria-carrying psyllid flies to a healthy plant and injects bacteria into it as it feeds.

HLB can kill a citrus tree in as little as five years, and there is no known cure. All commonly grown citrus varieties are susceptible to the disease.

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.

Learn more about HLB and how to protect your crops from it by following these links. 


News Stories: 

Distribution & Management: 

IPM Blog: 

IPM Pest Notes 

California Citrus Pest & Disease Prevention Committee: 

Topics in Subtropics Blog

  • Psyllid News Along the California Coast

    Added November 17, 2017
    HLB symptoms

                  Task Force ACP-HLB update HLB update To date, 232 residential citrus trees in Southern California have tested positive for the HLB bacterium. All have been, or are being,...

  • Central Valley Avocado Meeting

    Added November 15, 2017
    avocado cluster

       Interested in San Joaquin Valley Avocados?   Where: UC Lindcove Research and Extension Center Conference Room (22963 Carson Ave, Exeter, CA 93221), Central Valley.   Tentative Program: Welcome and Introductions –...

  • Berry Meeting for Coastal Subtropical Growers

    Added November 13, 2017
    blackberry 2

      You are invited to the North American Raspberry & Blackberry Conference February 21-24, 2018 • Ventura, California A MAJOR CANEBERRY MEETING in A LEADING PRODUCTION AREA   Schedule Wednesday, February 21: Opening...

  • Bees to Look Out For

    Added November 9, 2017
    bees book frankie

    Nearly 1600 species of native bees can be found in California's rich ecosystems; this colorful pocket-sized card set will help you identify 24 of the most common bees found in urban gardens and landscapes. Using this card set, you'll be able to identify...

  • Avocado Toast is Going to Have Lots of Orgins

    Added November 8, 2017
    avocado fruit

    'Hass' avocados are now being imported from Colombia.  The US consumption of avocados has increased from about a pound per person per year in 1980 (mostly consumed in California, Florida, Arizona, Texas and Hawaii) to over 7 pounds today and eaten...

  • DPR CE Units Online - Now

    Added November 8, 2017
    IPM Units

    UC Statewide IPM Program November has arrived, and before you know it we'll be ringing in 2018! For those who hold a license or certificate from the Department of Pesticide Regulation (DPR), and have a last name starting with the letter M through Z,...

Avocado Production in California Books

Book 1: Background Information

In Book 1, Gary S. Bender, Farm Advisor, takes you through the history of the avocado industry in California and teaches you about grove development.

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Book 2: Cultural Care

Book 2 focuses on cultural care and includes articles on irrigation, fertilization, disease and insect control, vertebrate pest management, pruning and frost management. The author for most of the articles is Gary S. Bender, Farm Advisor for Subtropical Horticulture in San Diego County.

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