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

  • Frost Damage in July?

    Added July 10, 2018
    heat damage to redwood

    So, this weekend we had some hot weather and the damage from that heat is apparent in all kinds of plants. Sycamores, cottonwoods and willow in the Santa Clara River bottom look torched. Redwoods in the landscape look like a new disease has hit...

  • NASA Soil Moisture Mapping

    Added July 9, 2018
    soil moisture US

    NASA's Maps of Global Soil Conditions                              Are...

  • Avocado Fair! Yeah!

    Added July 6, 2018
    avocado biggest

    Presented byCalifornia Avocado Society, Inc., California Avocado Commission, and University of California Cooperative Extension  AgFair Flyer PDF  AgFair Vendor/Sponsor Form California Avocado Growers Seminars Series 2018 Scheduled...

  • Learn to Scout ACP

    Added July 4, 2018
    ACP traps

      UC to conduct ACP scouting workshops Registration is now open for Asian citrus psyllid scouting workshops to be conducted in Fillmore and Moorpark on July 13. Intended for grove owners, managers or farm employees, the sessions will...

  • Dust and Roundup

    Added July 2, 2018

    Agronomy and Weed Science Advisor, Merced County It's getting hot and dry in the Central Valley and the movement of equipment in and out of fields/orchards/vineyards has the potential to stir up a significant amount of dust. Among its other impacts to...

  • Avocado-Disease Dog Sniffers

    Added June 29, 2018
    dog sniffer

    Dogs can detect agricultural diseases early Study shows dogs can sniff out laurel wilt-infected avocado trees well in advance American Society for Horticultural Science A study out of Florida International University evaluates the use of...

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.

Browse by Chapter

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.

Browse by Chapter

Webmaster Email: