Abstract
Tobacco budworm, Heliothis virescens (F.), pupal diapause was induced by exposing fourth instars through pupae to fluctuating temperatures with means of 30, 32, and 35°C and maximum temperatures of 37.8, 40.6, and 42.8°C Percentages of pupal diapause increased with increasing temperatures, as did larval mortality, pupal deformity, and mortality. Higher percentages of male pupae diapaused than did females. Percentages of egg hatch from control (26.7°C) female moths mated to male moths from diapause pupae were not significantly different from those of control pairs. However, percentages of egg hatch of control female moths mated to male moths from nondiapause pupae exposed in the larval/pupal stages to high fluctuating temperatures were significantly reduced compared with those of control pairs or female moths (controls) mated to male moths from diapause pupae. Female moths from nondiapause pupae exposed in the larval/pupal stages to high fluctuating temperatures were less sensitive to the sterilizing effect of the treatment than male moths. Sperm development ceased in testes of high temperature-induced diapause pupae and resumed when diapause pupae were moved to constant 26.7°C temperatures.
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