Transmission of the virus of Pierce's disease of grapevines by leafhoppers

摘要: In single-insect transmission of virus from infected to healthy grapevines, the most efficient vectors tested were Neokolla circellata (65 per cent), Cerneocephala fulgida (33 and Helocbera delta (32 cent). Lower percentages obtained with Draeculacephala minerva, Friscanus friscenus, N. severini, Pegaronia confusa. No infections P. triunata or confluens var. pacifica. circelleta was only one four species that gave a significant virus grapevines alfalfa (35 tests, no transmissions five species, conjuse, Some proved inefficient short-lived when confined on grapevines in greenhouse. Species leafhoppers subfamily Anthysaninae, two fulgorids, unidentified cicadas failed transmit the virus. transfers minimum latent period 2 hours Carneocephala fulgida, 7 Draeculacepbala minerva. greenhouse, some adults blue-green sharpshooter, reared infected retained throughout adult life, case for 122 days.