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Asian citrus psyllid carries bacteria called Candidatus liberibacter asiaticus,
abbreviated CLas, that enters plants when the insect feeds on them. The bacteria
result in small, misshapen and unripe fruit with no commercial value and eventually
kill the tree. The disease is known by its Chinese name, huanglongbing, or HLB.
Asian citrus psyllid arrived in San Diego and Imperial counties in 2008 after
decimating citrus crops in China, Brazil, and Florida. It moved steadily north,
appearing in Riverside County in 2010, and by 2019 had been observed in almost
every county between San Diego and Sacramento.
Victoria Hornbaker, the director of the citrus pest and disease prevention division
of the California Department of Food and Agriculture, or CDFA, told the crowd
that Asian citrus psyllid has been detected in 26 counties but that tarping bulk
citrus during transport and strict procedures for growing nursery stock, along with
regional quarantines, have so far prevented HLB from becoming well established in
commercial groves. Orange County, the epicenter for HLB in California, and
Riverside, where HLB has also been detected, are both under quarantine.
Eradication has also been effective in some areas? nine counties have had no
Asian citrus psyllid detections for two years.
Backyard citrus is another story. The majority of HLB infections are in residential
citrus. The CDFA conducts a trapping program to detect the insects and determine
their range, conducts residential surveys for the insect and HLB, and treats
backyard trees in infected areas with pesticides.
Any tree that tests positive for CLas must be removed. Even if a CLas-positive
tree does not show symptoms of HLB it can transmit the bacteria to an uninfected
Asian citrus psyllid during feeding, and the psyllid can, in turn, transmit the
bacteria to another tree. Hornbaker said that anyone worried that their tree might
have HLB should call their county agricultural commissioner or the state hotline
(1-800-491-1899).
Beth Grafton Cardwell
- 311 -
abbreviated CLas, that enters plants when the insect feeds on them. The bacteria
result in small, misshapen and unripe fruit with no commercial value and eventually
kill the tree. The disease is known by its Chinese name, huanglongbing, or HLB.
Asian citrus psyllid arrived in San Diego and Imperial counties in 2008 after
decimating citrus crops in China, Brazil, and Florida. It moved steadily north,
appearing in Riverside County in 2010, and by 2019 had been observed in almost
every county between San Diego and Sacramento.
Victoria Hornbaker, the director of the citrus pest and disease prevention division
of the California Department of Food and Agriculture, or CDFA, told the crowd
that Asian citrus psyllid has been detected in 26 counties but that tarping bulk
citrus during transport and strict procedures for growing nursery stock, along with
regional quarantines, have so far prevented HLB from becoming well established in
commercial groves. Orange County, the epicenter for HLB in California, and
Riverside, where HLB has also been detected, are both under quarantine.
Eradication has also been effective in some areas? nine counties have had no
Asian citrus psyllid detections for two years.
Backyard citrus is another story. The majority of HLB infections are in residential
citrus. The CDFA conducts a trapping program to detect the insects and determine
their range, conducts residential surveys for the insect and HLB, and treats
backyard trees in infected areas with pesticides.
Any tree that tests positive for CLas must be removed. Even if a CLas-positive
tree does not show symptoms of HLB it can transmit the bacteria to an uninfected
Asian citrus psyllid during feeding, and the psyllid can, in turn, transmit the
bacteria to another tree. Hornbaker said that anyone worried that their tree might
have HLB should call their county agricultural commissioner or the state hotline
(1-800-491-1899).
Beth Grafton Cardwell
- 311 -
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