Napa inspectors on March 7 discovered the eggs on some plants that were transported to the Walmart Supercenter in American Canyon, said Napa County Agricultural Commissioner Greg Clark.The shipment came from an Orange County supplier, Nakase Brothers Wholesale Nurseries of Lake Forest, Clark said.
Inspectors destroyed eight plants where the egg masses were found. No other problems were found on the remaining plants.
The next day, Sonoma County inspectors destroyed plants that also were found to have egg masses. They also were on the shipment from Nakase Brothers, according to Clark.

 Local agricultural officials have been on guard for years against the glassy-winged sharpshooter because it can transmit Pierce’s disease into a grapevine. Besides the inspection programs, they also have carried out public education efforts.