Pierce's disease assessment funds grapevine moth research; weighs other invasive pests. Since 1999, the California Department of Food & Agriculture’s Pierce’s Disease/Glassy-winged Sharpshooter Control Program has pumped some $440 million from federal, state, local and industry contributions into research and outreach to eliminate the destructive disease and its insect vectors. Administered by the PD/GWSS Board, the continuing campaign—including about $39 million in winegrape growers’ self-assessments since 2002—has succeeded in dramatically reducing PD’s spread, although eradication is far from complete.