Treatment Schedules by Region

Treatment strategies for the Asian citrus psyllid are different in various regions of the state depending on if the psyllid is well-established (requiring an area-wide management strategy) or is new to an area (requiring an eradication strategy). More details about eradication strategies and treatments can be found on the University of California’s website.

Below are the currently scheduled coordinated and area-wide treatments across the state. All dates and information are subject to change. For additional questions or information, contact your grower liaison about area-wide management and how to implement the recommended protocols.

Central Coast

3 weeks in January and September

  • Winter: Jan. 3-23, 2021
  • Fall: Sept. 5-25, 2021

Eradication – no area-wide treatment

Coordinated ACP treatments for Ventura County:

  • Fall 2021: Mid-July through Mid-September
  • Winter 2021: Mid-October through Mid-November

All treatments will follow the same progression through the county’s psyllid management areas (PMAs) as in previous years. Growers are also encouraged to include an ACP-effective material when spraying for other pests during the summer months.

Central Valley

Eradication – no area-wide treatment

The San Joaquin Valley ACP/HLB Task Force is recommending growers with citrus blocks east and south of Bakersfield participate in a coordinated treatments:

  • Mid-August through mid-September 2021

Eradication – no area-wide treatment

Eradication – no area-wide treatment

Eradication – no area-wide treatment

Southern California

The following treatment window allows each growing zone to coordinate the two-week target window in which they will treat within. The dates below are set by the Pest Control District Board.

  • Fall: Sept. 6, 2021 – Oct. 2, 2021
  • Spring: Feb. 15, 2021 – April 17, 2021

Conventional, 1 Treatment from:

  • Zones 2/3 are Jan. 4 – Jan. 18
  • Zone 1 is Jan. 11 – Jan. 25
  • Zone 4 is Jan. 18 – Feb. 1

Conventional, 1 Treatment from:

  • Zones 2/3 are Dec. 30 – Jan. 23
  • Zone 1 is Jan. 6 – Jan. 30
  • Zone 4 is Jan. 13 – Feb.

The Hemet area CPCD has three mandatory ACP treatments per year:

  • Winter: Dec. 19, 2020 – Jan. 10, 2021
  • Spring 2021 treatment will be required in May. Exact dates TBD.
  • Summer/Fall 2021 treatment will be required in September. Exact dates TBD.

2021/2022 ACP Treatment Schedule

  • Spring Treatment – May 1 – July 15, 2021
  • Summer Treatment* – July 16 – Aug. 15, 2021
  • Fall Treatment* – Oct. 15 – Nov. 15, 2021
  • Winter Treatment – Nov. 16 – Dec. 15, 2021

* May be a perimeter spray if scouted & determined that the center has no ACP

Fall 2021:

  • August 30 – September 13, 2021: Pauma Valley, San Pasqual and citrus outside the PCD
  • September 1 – 15, 2021 (Systemic); October 1 – 15, 2021 (Foliar): Borrego PCD

Summer 2021:

  • May 17 – May 31, 2021: Pauma Valley and San Pasqual PCD

Winter 2021:

  • January 4 – 18, 2021: Citrus located outside the San Diego Co. PCD
  • January 4 – 18, 2021: Pauma Valley and San Pasqual PCD
  • January 11 – 25, 2021: Borrego PCD