Abstract
Heliothis punctigera exhibits a facultative pupal diapause that is regulated by photoperiod and temperature. The greatest proportion of pupae enter diapause when the larvae are reared at 19° C and 12–12.5 hr of light per day. The proportion diapausing falls steeply at both longer and shorter photoperiods. Diapause induction is also increased with a decrease in photoperiod betwen the egg and larval stages. Diapause is averted in a high proportion of pupae if they are held at 28° C compared with those held at 19° C. The significance of these results is discussed in relation to the life-cycle of H. punctigera in South Australia, in particular to its capacity for overwintering.
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