Laboratory selection has resulted in strains of this insect predator able to survive field rates of a pesticide.

The authors thank Ciba-Geigy, Dupont, Shell, Stauffer, and Union Carbide Chemical companies for providing the pesticides used in screening and selection. Partial support for this project was provided by the California Department of Food and Agriculture, Environmental Monitoring and Pest Management and Biological Control Services Program; and by the Western Regional Research Project W-84, “Establish, improve, and evaluate biological control in pest management systems.”