Abstract

Larvae of Hypera postica (Gyllenhal) from the eastern United States were subjected to diapause-inducing photoperiods at various stages of development to study the relationship of photoperiod and larval development upon the induction of diapause in the adult weevil. Adults from larvae which were exposed to short-day photoperiods did not diapause, whereas adults from larvae exposed to long-day photoperiods did diapause. As little as 1 day of long-day photoperiod during larval development was sufficient to induce diapause in the adult. Adults from larvae which were subjected to an uninterrupted 16-hr photophase diapaused, whereas adults from larvae exposed to 16 hours of light which was interrupted by two 4-hour periods of scotophase did not diapause, and limited observations suggest that starvation of the larva in the late 3rd and 4th stages induced diapause in the adult.

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