Photoperiod in relation to diapause in<i>Lygus hesperus</i>Knight

Abstract

Lygus besperus Knight, a common polyphagous insect pest of certain widely grown California crops, undergoes a seasonal facultative diapause. Experiments described here were conducted upon both field-collected and laboratory-raised L. besperus populations and have demonstrated the critical effects of photoperiod and temperature upon the inception, termination, nullification, and intensity of diapause in this species.