Habitats and dispersal of the principal leafhopper vectors of Pierce's disease bacterium in the San Joaquin Valley.
The habitat preferences and dispersal behaviour of the cicadellids Draeculacephala minerva and Carneocephala fulgida, vectors of Pierce's disease bacterium to grape and lucerne, are described from observations and experiments conducted in California in the 1940s and 1976-80. Both species reached their greatest density on Bermuda grass (Cynodon dactylon) and watergrass (Echinochloa crus-galli). Adults dispersed throughout the growing season from breeding habitats. The studies suggested that the most productive strategy for preventing diseases spread by these cicadellids is to eliminate their habitats by weed control and irrigation practices.