Mass trapping for redbanded leafroller (RBLR), Argyrotaenia velutinana, and grape berry moth, Paralobesia viteana, in 2 vineyards in 1971 resulted in a substantial reduction in percent of damage compared to a check area. An extremely high population of RBLR was present, but located mainly outside the vineyard. In 1972 mass trapping experiments were continued in one vineyard, with results similar to 1971, and a mating disruption experiment initiated in the other vineyard. Data from the first year of disruption shows for both species there was almost total disruption of male orientation to attractant and live female traps, and that there was a substantial reduction in crop damage. The close proximity (12.2 m) of high populations in the check vineyard could have influenced damage counts in the disruption experiment.