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Posted on: February 2, 2021

CDFA Provides Notice of Treatment for the Asian Citrus Psyllid

Citrus Pest and Disease Treatment

Between April 3, 2017, to December 11, 2020, the California Department of Food and Agriculture (CDFA) confirmed the presence of the causative bacterial agent of the citrus disease Huanglongbing (HLB) in citrus tree tissue and insect vectors collected in several OC cities including Yorba Linda. HLB is a devastating disease of citrus and is spread through feeding action by populations of the Asian citrus psyllid (ACP). In order to determine the extent of the infestation, and to define an appropriate response area, additional surveys took place for several days over a 250-meter radius area, centered on the detection sites. Based on the results of the surveys, implementation of the CDFA’s current ACP and HLB response strategies, which include treatment for ACP, are necessary for eradication and control.

A Program Environmental Impact Report (PEIR) has been certified which analyzes the ACP and HLB treatment program in accordance with Public Resources Code, section 21000. The treatment activities described below are consistent with the PEIR.

In accordance with integrated pest management principles, CDFA has evaluated possible treatment methods and determined that there are no physical, cultural, or biological control methods available to control ACP in this area. The treatment plan for the ACP infestation will be implemented within a 250-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 from 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. CoreTect™, which is used in place of Merit® 2F in situations where there are environmental concerns about soil surface runoff of liquid Merit® 2F, is applied by inserting tablets into the ground and watering the soil beneath the host plants.

Public Notification

Residents of affected properties shall be invited to a public meeting or contacted directly by CDFA staff. Consultation with the California Department of Pesticide Regulation, the Office of Environmental Health Hazard Assessment, and the county agricultural commissioner’s office will be provided at the public meeting or upon request 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 sections 5771-5779 and 5421-5436.

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 on the CDFA's website. Press releases, if issued, are prepared by the CDFA public information officer and the county agricultural commissioner, in close coordination with the program leader responsible for the treatment. Either the county agricultural commissioner or the public information officer serves as the primary contact to the media.

Information concerning the HLB/ACP program shall be conveyed directly to local and State political representatives and authorities via letters, emails, and/or faxes. 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.

What Can you Do?

The best way to protect citrus trees from the disease is to control the psyllid population.

  • Inspect citrus trees for signs of the pest and disease each month or whenever watering, spraying, pruning, or tending trees;
  • Call the California Department of Food & Agriculture hotline at 1-800-491-1899 if any suspicious pests or symptoms of HLB are found;
  • Don’t bring any plant material into California from other states or countries and don't move citrus plants out of quarantined areas, because they might be carrying psyllids or be infected with HLB;
  • Only buy citrus trees from reputable, licensed California nurseries;
  • Dry or double bag plant clippings before placing them in green waste recycle bins to avoid moving psyllids and HLB-infected plant material and;
  • Cooperate with agriculture officials on detection and suppression efforts of the Asian citrus psyllid and HLB.

The Asian citrus psyllid was first detected in California in 2008 and is known to exist in Ventura, San Diego, Imperial, Orange, Los Angeles, Santa Barbara, San Bernardino, and Riverside counties. If Californians believe they have seen evidence of huanglongbing in local citrus trees, they are asked to please call CDFA’s toll-free pest hotline at 1-800-491-1899. For more information on the Asian citrus psyllid and huanglongbing, visit

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