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Drought and concerns with over-drafting of ground water cloud the season for a number of walnut grow
Clark said, “We do not want this pest to become established in Napa County.”
Pest detection trappers from the Ag Commissioner’s Office were deploying 25 additional traps within a mile radius of the Calistoga find.
The pest is not native to Napa County but has been found in the county several times in the past. The last find was on Mt. Veeder Road in 2007. The pest, native to Arizona and New Mexico, was first discovered in California in the 1940s. It eventually spread throughout the state, especially in the Central Valley.
According to the University of California (UC) IPM website, western grapeleaf skeletonizer moths fly during the day and are metallic blue or greenish black in color.
The wing span is 1 to 1.3 inches with a .6-inch body length.
