The silverleaf whitefly, Bemisia n. sp., infested vegetable crops in the Imperial Valley of California during the fall of 1990. Silverleaf whitefly overwintered on cole crops, weeds and ornamental plants to infest spring melons. The whitefly adults migrated from spring melons to cotton and from cotton to fall plantings of vegetable crops. This cycle has continued to cause economic losses to cotton growers as well as losses to vegetable and alfalfa growers. Cultural practices and biological control agents, parasitoids and predators of whitefly, have not eliminated the economic losses, nor are whitefly resistent cultivars available to prevent losses. Twelve insecticide products were used alone or in combination and an insect growth regulator was used for control of whiteflies. The highest levels of silverleaf whitefly control and greatest yields were obtained from Orthene^® 90S at 0.5 pounds active ingredient per acre tank mixed with Danitol^® 2.4 EC at 0.2 pounds active ingredient per acre and the Valent insect growth regulator S-71639 at 0.07 pounds active ingredient per acre. The next highest yields and whitefly control were from S-71639 at 0.04 pounds active ingredient per acre, Mustang 1.5E plus Orthene 90S at 0.04 and 0.5 pounds active ingredient per acre, Baythroid^® 2EC plus Monitor^® 4 at 0.05 and 0.5 pounds active ingredient per acre, Asana XL^® plus Thiodan 3EC at 0.05 and 1.0 pounds active ingredient per acre and Capture 2EC at 0.08 pounds active ingredient per acre.