Asian Citrus Psyllid Distribution and Management
University of California
Asian Citrus Psyllid Distribution and Management


The strategy for all regions is to minimize the number of extra pesticide treatments applied for ACP in order to preserve IPM programs for other pests and reduce the risk of resistance developing. 

Ventura area-wide program: ACP is well established in Ventura County.  The area-wide program for this region consists of a coordinated application in late winter to kill overwintering adults and to protect spring flush and two coordinated fall treatments to protect citrus during Aug-Nov.  Additional grower choice treatments are encouraged in between coordinated treatments. Whenever treating for another pest, choose a pesticide that will also control ACP. For example, the Fujimite, Agri-Mek, Lorsban and Movento treatments (shown in red) applied for common pests would assist with ACP control.


Special Notes for Ventura Growers

  • The goal is to suppress psyllids below 0.5 nymph/flush.
  • Lemons flush continually and support psyllid nymphs throughout most of the year.
  • Urban areas infested with ACP can be a source of psyllids for groves.
  • If sampling demonstrates psyllid populations are increasing ahead of the timing of the coordinated treatment, then apply a full orchard or border spray (if psyllids are only found on the borders) in addition to the coordinated treatment.
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