During 1995, Provado 1.6 F became registered in California for foliar uses on cotton to control various sucking insects including aphids and lygus bugs. This paper summarizes large scale trials evaluating yield responses as well as effects on beneficial insects. Provado provided 7-10 days of control of lygus bugs and up to 14 days of control of aphids. The most significant yield increases were observed where Provado was used and aphids were the major pest. Where lygus and aphids were present, tank mixes of Provado and Baythroid produced the greatest enhancement of yield.

A significant correlation between the number of aphids at the peak infesta-tion and the reduction in yield was determined. Where the peak infestation ranged between 30 and 150 aphids/leaf, yields dropped approximately four pounds for every one aphid/leaf increase. Provado exhibited little detri-mental effect on big-eyed bugs and minute pirate bugs and a modest effect on damsel bugs. Effectiveness of Provado is optimized when it is applied early in the development of the infestation and by ground