Abstract
Tobacco budworm, Heliothts virescens (F.), larvae placed in the insectary in late June and July entered pupal diapause and did not emerge until late September and early October except for one or two instances when low temperatures occurred during pupation. Pupal diapause initiated from March through July resulted in adult emergence in September and early October. Duration of the high-temperature-induced diapause pupal stage when pupae were transferred to cooler temperatures ranged from 14 days at 30°C to 69 days at 15°C. This postdiapause development was significantly longer than pupal development of nondiapause insects. Duration of the postdiapause pupal stage varied with temperature conditions inducing and terminating diapause. Postdiapause development was slower for individuals induced to diapause at lower temperatures (32.6°C) than for those individuals induced to diapause at higher temperatures (40°c). Response of sterile male hybrid pupae resulting from the cross of female H. subfiexa (Guenee) and male H. virescens was similar to that of H. virescens male pupae in relation to high-temperature conditions inducing diapause and low-temperature conditions terminating diapause.
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