APHELOPUS-ALBOPICTUS ASHMEAD (HYMENOPTERA, DRYINIDAE) - ABUNDANCE, PARASITISM, AND DISTRIBUTION IN RELATION TO LEAFHOPPER HOSTS IN GRAPES
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Aphelopus albopictus has been reported as a major mortality agent for grape leafhopper Erythroneura elegantula in the San Joaquin valley, California. Parasitism levels varied widely among different vineyards. Studies report up to 33% parasitism of adult grape leafhoppers, with levels considerably less during much of the season. Variegated laefhopper, which was abundant at one of the study sites, is rarely parasitized by A. albopictus. Chemical intervention for control of this pest will likely increase, resulting in disruption of the normally high level of biological control directed against the grape leafhopper. -from Authors