During the past year there were reports of widespread resistance in the whitefly, Bemisia tabaci, population of the Imperial Valley in California. A population of tobacco budworm, Heliothis virescens, from the West Texas cotton fields was found to have a 15-20 fold resistance to pyrethroid insecticides. A new method of measuring resistance in the field, the attracticide method, was perfected for adult pink bollworm, Pectinophora gossypiella. In the attracticide method adult moths collect themselves, sex themselves, and dose themselves. The field worker then collects the traps and counts mortality after two days without handling the moths themselves. Sophisticated toxicity information obtained in this way enabled "hot spots" of resistance to be identified in individual cotton fields far more rapidly than ever before.