The Asian Citrus Pyllid (ACP) is a threat to the citrus industry in California, and has been rapidly spreading since 2010 with no way to stop it. The Psylid carries a bacteria that causes citrus greening disease where the fruit does not ripen and the tree eventually dies.

The ACP quarantine area has spread and pesticides are voluntarily being applied by growers to buy more time in hopes of finding a treatment. A recent map of the current ACP quarantine area (in blue) and HLB treatment areas (in red)  show the most recent expansion of ACP up into the Sacramento area.  The orange areas on the map below are concentrations of commercial citrus growers where pesticides treatments are voluntarily being applied up to 4 times per year as recommended by CDFA.

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The ACP Statewide Management Program for the ACP / Huanglongbing (HLB) (bacteria) is guided by the Secretary of the California Department of Food and Agriculture (CDFA) with guidance from the  California Citrus Pest And Disease Prevention Committee (CCPDPC).  See their website for links to meetings, minutes and strategies.  Their next meeting is scheduled for Tuesday, November 12, 10-4 at the Crown Plaza in Ventura. The current  methodology/treatment options by CDFA for ACP are here and consist of research into treatment methods, quarantines, followed by pesticides, fence barriers, spraying fence barriers, followed by more frequent application of even more pesticides.

The most recent attempt at a treatment plan for Ventura County growers came from researchers and academics at UC Riverside.

Screen Shot 2019-09-16 at 2.29.36 PM.pngOn July 29, 2019, California Dept of Food & Ag. issued an Official Notice of Treatment for Ventura County along with a map showing  the location of the ACP Treatment Areas.

Notice of Treatment (NOT):

Excerpts from the VC Official Notice of Treatment are below:





… 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 eliminate the ACP from this area. Notice of Treatment is valid until June 12, 2020, which is the amount of time necessary to determine that the treatment was successful.

The treatment plan for the ACP infestation will be implemented within a 400 -meter radius (equals approximately 400 yards, 1/4 mile or 4 football fields) 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. Link to Q & A on Merit is here and  CoreTect™ is here

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 the 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 where officials from CDFA, the Department of Pesticide Regulation, the Office of Environmental Health Hazard Assessment, and the county agricultural commissioner’s office shall 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 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.

More Information on Pesticides used from CDFA’s Website Under HOT TOPICS

What to Expect when CDFA is Inspecting, Trapping and Treating



A state mandated quarantine was initiated for Ventura County back in December of 2010 for the ACP.  A quaratine is an attempt to isolate and control spread of harmful insects, restricting their movement and requiring spraying and treatment to contain, manage and control populations.

Area Wide Management (AWM) was initiated in 2016 to coordinate growers for the management and treatment of insects in a quarantined area to reduce spread of the insect.  The AWM for Ventura County was initiated by the Ventura County ACP-HLB Task Force, which is a growers organization organized in 2010 and supported by the VC Farm Bureau to:

“coordinate an effective industry response to the threat posed by the Asian citrus psyllid, with the goal of achieving maximum suppression of the ACP population and delaying the introduction and potential spread of Huanglongbing disease.”

HERE is a dropbox folder with the ACP-HLB Task Force presentations and maps showing treatment areas in Ventura County.

Their contact info is 805-289-0155
Link to their Facebook page:
In Ventura County, the University of California Division of  Agriculture and Natural Resources   “strategy for all regions is to minimize the number of extra pesticide treatments applied for ACP in order to preserve IPM programs and reduce the risk of resistance. ”  More info HERE
The 2019-2020 Area Wide Management Plan for treatment is attached below.
2019-2020 AWM schedule final


Early Detection options are less toxic with more info HERE

Background info on ACP/HLB
-UC IPM Pest Notes