Abstract
ABSTRACT. When batches of about 100 moths of mixed age and sex were kept at 25°C, 65±5%r.h., few eggs were laid by Ephestia cautella, E.kuehniella, E.elutella and Corcyra cephalonica while they were exposed to light of 400‐1000lx for up to 12h. Large numbers were laid soon after the light was switched off, however, and the yield during the first hour of darkness increased as the period previously spent in light increased from 1 to 18h. Plodia interpunctella, on the other hand, laid many eggs in light and the numbers laid subsequently during the first hour of darkness in the Slough stock were not influenced by the duration of the light exposure. In LD 12:12, the first four species laid most of their eggs during the scotophase, with E.cautella laying the largest number and E.elutella the smallest. E.cautella transferred from LD 12:12 to constant darkness showed a free‐running circadian rhythm for at least three cycles, with most eggs laid near the time that was previously the first hour of darkness, but those transferred to constant light free‐ran for only one cycle.
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