Napa County Winegrape Pest & Disease Control District

The Napa County Winegrape Pest and Disease Control District's purpose is to provide funding for the inspection, detection, prevention, and education of Pierce's disease, with the goal of preventing the movement or spread of Glassy-winged Sharpshooter (GWSS) into Napa County and thereby preventing the spread of Pierce's disease by the insect. Currently, Napa County grower losses due to Pierce's disease are in the millions of dollars annually- the introduction and establishment of the GWSS would multiply those losses many times. District assessments help fund the deployment of vineyard GWSS traps and the inspection of incoming plant materials.

In 2006, Napa County growers voted to expand the scope of the District to include programs to detect and control other potential winegrape pests. District funds currently help with the monitoring and control of Vine Mealybug and help fund a "sentinel" trapping program, which targets pests not known to occur in the United States, or which may occur in a very limited distribution.