ELECTROPHORETIC DETECTION OF DRYINID PARASITOIDS IN EMPOASCA LEAFHOPPERS

Adults of Empoasca decipiens Paoli 1930, E. solani (Curtis, 1846) and E. vitis (Gothe, 1875) (Hom.; Auchenorrhyncha, Cicadellidae) were coll ected by sweepings on potato (Solanum tuberosum L.) and grapevine (Vit is vinifera L.), but only E. decipiens was parasitized by dryinids, pr obably Lonchodryinus ruficornis (Dalman) (Hym.; Dryinidae, Anteoninae) . Parasitized and unparasitized leafhoppers were assayed by polyacryla mide gel electrophoresis (PAGE) to identify isozymes for diagnosing dr yinids. The alpha-glycerophosphate dehydrogenase (alpha-GPD) enzyme sy stem proved to be a reliable tool for the detection of parasitized ind ividuals.