The glassy-winged sharpshooter is a large leafhopper that can transmit several important, often fatal, plant diseases in California. This includes Pierce's disease of grape, alfalfa dwarf, almond leaf scorch, and mulberry leaf scorch. Pierce's disease is of most concern in California since the state accounts for about 94% of U.S. grape production.

Pierce's disease of grape has been reported in many counties throughout California. View a map of the current distribution of the pathogen. Glassy-winged sharpshooter adults...