Coordinated Psyllid Treatment Recommended in California

Josh McGillCalifornia Corner, Pesticides, Psyllids

The San Joaquin Valley ACP (Asian citrus psyllid)/HLB Area-Wide Task Force in California is recommending growers participate in a coordinated treatment application in commercial citrus orchards. This recommendation is for orchards located east and south of Bakersfield and includes young, non-bearing trees. The recommendation comes as a result of higher than normal HLB-spreading ACP finds in traps earlier this summer.


The task force is recommending growers treat commercial orchards between mid-August and mid-September to help mitigate the historical increase in ACP populations that fall brings. In past years, coordinated treatments like this have shown significant success in suppressing fall ACP populations in commercial citrus.

“In order to protect our citrus from the devastating effect of HLB, it is extremely important to keep ACP as low as possible,” said ACP/HLB Grower Liaison for Kern County Judy Zaninovich. She can be contacted at 559-730-8691 for more information.

The task force is urging growers in the recommended treatment area to take the following actions:

Growers may choose one of two actions:

  1. Apply a soil-applied imidacloprid (Admire Pro or generic imidacloprid 2F, 4F, etc.) or Platinum treatment sometime mid-August through mid-September. California Citrus Mutual stated it has heard that there may be a shortage of imidacloprid, so growers wanting to use it should order it as soon as possible.
  2. Apply a foliar material with long-lasting residual, like Actara, in the mid-August through the end of September timeframe. Any ACP-effective material can be used, but Actara has long residual activity on ACP, according to University of California research trials.

ORGANIC GROWERS The task force recommends organic growers apply two ACP-effective foliar treatments from mid-August through mid-September. See the University of California’s UCIPM guidelines for a list of ACP-effective materials.

For foliar applications, it is recommended that growers treat the borders of the orchard prior to treating the interior. That way, ACP adults will move inward toward an area that will be treated.

Source: California Citrus Mutual

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