Aphelopus albopictus Ashmead (= A. comesi Fenton), a dryinid nymphal-adult parasite, has been reported as a major mortality agent for grape leafhopper, Erythroneura elegantula Osborn, in the San Joaquin Valley of California. Parasitism levels varied widely among different vineyards. Our studies report up to 33% parasitism of adult grape leafhoppers, with levels considerably less during much of the season.
