Abstract

A higher incidence of diapause can be induced in the pink bollworm, Pectinophora gossypiella (Saunders), when larvae are reared in continuous darkness on 24 hr temperature cycles than when reared in continuous darkness at a constant temperature equal to the mean. The fluctuating temperature treatments produce a more intense state of diapause as well as a greater number of diapausing insects. Pink bollworm eggs appear sensitive to photoperiod.

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