Wine grape growers in Washington State have reduced their use of chlorpyriphos by over 15,000 lbs annually by adopting new pest control practices we developed. Adopting our practices has increased grower returns by over $6 million/yr. Our pest control tactic involves the application of a small targeted band of pyrethroid insecticide to the trunk of grapevines in early spring. This band of insecticide repels climbing cutworms and prevents them from climbing up from the ground onto the cordon to feed on swelling buds in spring as the vines break from winter dormancy. Cutworms have been the key spring season pests in the grape agroecosytem. A springtime broadcast application of chlorpyriphos for cutworm control disrupted beneficials and literally put grape growers on the “pesticide treadmill” to control secondary pests. The barrier spray technique is safer to beneficials then the broadcast application of chlorpyriphos. In 2002 about 17,000 acres of wine grapes were treated with chlorpyriphos for cutworm control at an expense of $38 per acre per application. Fenpropathrin applied as a barrier spray costs less then $18 per acre. Since 15,500 acres of grapes were treated with fenpropathrin instead of chlorpyriphos collectively in 2004 production costs in Washington State were reduced by $310,000. Additionally, vineyards treated with the pyrethroid barrier sprays have yielded an additional ˝ ton per acre on average compared to vineyards treated with chloropyriphos. At an average price of $700 per ton for all wine grapes we can estimate increased returns to grape growers by over $6 million.