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Light Brown Apple Moth in San Joaquin County

The California Department of Food and Agriculture (CDFA) recently confirmed that 2 moths trapped in the Guard Road area Southwest of Thornton were Light Brown Apple Moth (LBAM).  As a result, a Federal/State plant quarantine was established in this area. The purpose of the quarantine is to prevent further spread of Light Brown Apple Moth by controlling the movement of plant material that could carry LBAM outside of the quarantined area. In general the quarantine boundary encompasses a 1 ½ mile area surrounding the moth finds.

We are presently contacting the growers with fields within the quarantine boundaries so that we can obtain the necessary information for quarantine compliance agreements that will ensure the timely flow of commodities from their fields and facilities.  Each grower in the quarantine area must have a signed compliance agreement before moving harvested commodities from their fields. 

In March 2007, USDA confirmed the presence of Light Brown Apple Moth (LBAM), Epiphyas Postvittana in Alameda County.  By July of that same year it had been found in 8 San Francisco Bay area Counties as well as the counties of Santa Cruz, Monterey and Los Angeles.  Since then, despite numerous methods and attempts at eradication, Light Brown Apple Moth has continued its spread across the cooler regions of California, including moving eastward up the Delta and into San Joaquin and Sacramento Counties. 

*For a printable map of areas under regulation for LBAM in San Joaquin County, click here.  
*To view the areas under regulation for LBAM in San Joaquin County in Google earth, click here
   (to download Google Earth:

A single Light Brown Apple Moth was trapped in Manteca in June 2009. A second moth in July triggered San Joaquin County’s first quarantine.  This quarantine area was declared eradicated, only to have another series of finds in Tracy area.  This began the battle San Joaquin County has been fighting to prevent the spread of LBAM into the county. 

For information on obtaining compliance agreements contact the Agricultural Commissioner's office (209) 953-6000 (Stockton) or 331-7287 (Lodi). 

For more information on  Light Brown Apple Moth:


UC Cooperative Extension:  

 California Department of Food and Agriculture:  


San Joaquin County Agricultural Commissioner’s Office, growers and nurserymen are working together in an effort to eradicate LBAM from agricultural areas of San Joaquin County, as well as help prevent its spread to other agricultural regions.  All growers in the quarantine areas must be under compliance agreement with the Agricultural Commissioner's Office before commodities may be harvested and move from their fields and orchards and vineyards.  In addition, harvesters, trucking companies, packers and wineries handling grapes in the quarantine area must also be under compliance agreement. For information on obtaining compliance agreements contact the Agricultural Commissioner’s Office (209) 953-6000 (Stockton) or (209) 331-7287 (Lodi). 

Office of the Agricultural Commissioner

2101 E. Earhart Ave.
Suite 100
Stockton, CA 95206
Phone: (209) 953-6000
Fax: (209) 953-6022