Emergency Program Against the Huanglongbing Disease
Feb 03, 2017
Emergency Program Against the Huanglongbing Disease

The California Department of Food and Agriculture (CDFA) confirmed the presence of the citrus disease huanglongbing (HLB) in the City of San Gabriel.

Between May 16 and August 18, 2016, the California Department of Food and Agriculture (CDFA) confirmed the presence of the causative bacterial agent of the citrus disease huanglongbing (HLB) from citrus tree tissue and insect vectors collected in the city of San Gabriel, Los Angeles County. 
HLB is a devastating disease of citrus worldwide and is spread through feeding action by populations of the Asian citrus psyllid (ACP), Diaphorina citri Kuwayama. In order to determine the extent of the infestation, and to define an appropriate response area, additional survey took place for several days over a one-square mile area, centered on the detection site. The results of this additional survey indicated that the infestation is sufficiently localized to be amenable for effective implementation of the California Department of Food and Agriculture's current ACP and HLB response strategies, which include treatment for ACP and removal of any infected host plant. 

A Program Environmental Impact Report (PEIR) has been certified which analyzes the ACP and HLB treatment program in accordance with Public Resources Code, Sections 21000 et seq. The PEIR is available at The treatment activities described below are consistent with the PEIR. 
In accordance with integrated pest management principles, the CDFA has evaluated possible treatment methods and determined that there are no cultural or biological control methods available to control ACP and to eliminate HLB from this area. 

The treatment plan for the HLB infestation will be implemented within an BOO-meter radius of each detection site, as follows: 
  • Tempo® SC Ultra (cyfluthrin), a contact insecticide for controlling the adults and nymphs of ACP, will be applied fr:-om the ground using hydraulic spray equipment to the foliage of host plants; and
  • Merit® 2F or CoreTect™ (imidacloprid), a systemic insecticide for controlling the immature life stages of ACP, will be applied to the soil underneath host plants. Merit® 2F is applied from the ground using hydraulic spray equipment, whereas CoreTect™ , if used in place of Merit® 2F, is applied by inserting the tablets into the ground and watering the soil beneath the host plants.
Public Notification: 
Residents of affected properties may be invited to a public meeting where officials from CDFA, the Department of Pesticide Regulation, the Office of Environmental Health Hazard Assessment, and the county agricultural commissioner's office will be available to address residents' questions and concerns. Residents are notified in writing at least 48 hours in advance of any treatment in accordance with the Food and Agricultural Code, Section 5779 and 5401-5404. Following the treatment, completion notices are left with the residents detailing precautions to take and post-harvest intervals applicable to the citrus fruit on the property. Treatment information is posted at maps.html. Press releases, if issued, are prepared by the CDFA information officer and the county agricultural commissioner, in close coordination with the program leader responsible for treatment. Either the county agricultural commissioner or the public information officer serves as the primary contact to the media. 

For any questions related to this program, please contact the CDFA toll-free telephone number at 800-491-1899 for assistance. This telephone number is also listed on all treatment notices. 

Enclosed are the findings regarding the treatment plan, ACP work plan, map of the treatment area, integrated pest management analysis of alternative treatment methods, and a pest profile.


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