Wineries, residents and horses all want a piece of choice Southern California terroir. A decade ago, Temecula’s winegrowing future looked dim: An epidemic of Pierce’s disease (PD) had decimated vineyards, spread by glassy-winged sharpshooters (GWSS) from another of Riverside County’s top crops, citrus. Prompt reaction from the industry and government agencies caused growers to pull infected vines; and launched the ongoing, statewide PD/GWSS board. Largely funded by grapegrowers’ self- assessments, ongoing research has limited the potential threat and continues to seek control—if not full eradication—of the disease, which is lethal to grapevines