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  • The Asian citrus psyllid is the insect vector for the bacterium that can cause huanglongbing disease. Photo credit: UC Regents
    Asian citrus psyllid study: Vigilance urged but ‘no cause for panic’

    Nov 17, 2022

    • Agriculture
    • Food
    • Pest Management
  • This tree in Florida shows symptoms of huanglongbing (HLB) disease, including a thinning canopy and fruits that fall easily. HLB has devastated the citrus industry in Florida, and poses a threat to California growers. Photo: UC Regents
    Citrus threat target of $7 million multistate research project

    Dec 3, 2021

    • Agriculture
    • Food
    • Innovation
    • Pest Management
  • The two red-outlined areas show the ACP and HLB quarantine areas in Southern California. (Screen shot taken Aug. 13, 2020. For updated information, see https://ucanr.edu/sites/ACP/Distribution_of_ACP_in_California/)
    Asian citrus psyllid infected with huanglongbing disease found in Riverside citrus grove

    Aug 13, 2020

    • Agriculture
  • Citrus leaves exhibiting symptoms of huanglongbing infection.
    UC Riverside researcher discovers first effective treatment for citrus-destroying disease

    Jul 7, 2020

    • Agriculture
  • Go to http://ucanr.edu/hlbapp to find out how close you live to citrus that were infected with HLB.
    Consult UC ANR's map to see how close you live to citrus with HLB disease

    Apr 27, 2020

    • Yard & Garden
  • Jean Suan harvests persimmons, fruit that is easy to grow and creates a beautiful landscape display.
    Planting alternative backyard fruit trees in Southern California can help stop citrus threat

    Sep 9, 2019

    • Food
    • Yard & Garden
  • Georgios Vidalakis, left, and UC Riverside plant pathologist Wenbo Ma are among scientists searching for an HLB cure. (Photo: UCR Today)
    Screen installed over the 'parent navel' in Riverside to protect it from disease

    Jun 12, 2019

    • Pest Management
  • A symptom of HLB in citrus is the yellowing of leaves on an individual limb or in one sector of a tree's canopy. (Photo: Citrus Pest and Disease Prevention Program)
    Huanglongbing is a growing threat to California’s citrus industry

    May 31, 2019

    • Pest Management
  • The Riverside Washington Navel tree surrounded by open fencing in this 1932 picture. View the Riverside Press-Enterprise to see a photo of the large steel structure that now looms over the tree. (Photo: Department of Interior)
    Riverside Washington Navel gets additional protection

    Apr 16, 2019

    • Agriculture
  • The USDA has trained dogs to detect huanglongbing disease in Florida. (Photo: USDA)
    Dogs enlisted to sniff out disease in citrus trees

    Sep 18, 2018

    • Pest Management
  • Mottling and yellowing of leaves is a symptom of huanglongbing disease in a citrus tree. HLB is incurable and the tree will eventually die.
    Pesticide spray ban could assist spread of huanglongbing disease

    Mar 2, 2018

    • Agriculture
  • There is no known treatment for huanglongbing, which kills citrus trees.
    How to check your citrus trees for a deadly disease and the pest that spreads it

    Jul 28, 2017

  • Joanne O'Sullivan is one of the scouts hired by UC to search for and collect Asian citrus psyllids.
    UC has boots on the ground in an unrelenting search for Asian citrus psyllid

    Jul 28, 2017

  • UC Cooperative Extension specialist Beth Grafton-Cardwell is one of two UC ANR scientists who have developed the Science for Citrus Health website.
    UC puts high science online in easy-to-read citrus research updates

    Jul 18, 2017

  • Eremocitrus crosses at Lindcove REC are potentially promising in the pursuit of a genetic source of resistance to HLB. The fruit is golfball size and inedible.
    Three old trees might save the citrus industry

    Feb 24, 2017

  • Alireza Pourreza, UCCE agriculture engineering advisor.
    New Huanglongbing detection process wins UC advisor international prize

    Oct 20, 2016

  • Leaves on a Florida tree show symptoms of HLB disease. The new biosafety lab at UC Riverside will help scientists battle the disease. (Photo: Beth Grafton-Cardwell)
    Citrus industry, UC Riverside and UCCE team up to fight a citrus killer

    Jun 13, 2016

  • Beth Grafton-Cardwell.
    Citrus trees sprayed for Asian citrus psyllid in Highland

    May 3, 2016

  • Beth Grafton-Cardwell speaks with ABC30 reporter Dale Yurong, left, and cameraman Sam Gill at the UC Lindcove Research and Extension Center.
    Californians are checking new growth on citrus for Asian citrus psyllid

    Mar 9, 2016

  • Inspect the new flush on citrus trees to see whether the tree is infested with Asian citrus psyllid. (View a four-minute video below.)
    Spring in California is time to inspect citrus trees for Asian citrus psyllid

    Mar 7, 2016

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