Rapid response to selection for a nondiapausing gypsy moth.

By genetic selection a gypsy moth strain was obtained within eight generations that could be reared continuously in the insectary without its normal "obligatory" diapause. This strain should be useful for making physiological and genetical comparisons with normal diapausing gypsy moths. It could also be used in a genetic control program. However, caution should be exercised, for its release could create a new environmental hazard.