Abstract
Diapause in Ostrinia nubilalis (Hubner) was studied to determine factors that influence survival of laboratory-reared larvae in diapause at subzero temperatures. Survival and oxygen consumption were determined for larvae exposed to nondiapause- and diapause-inducing conditions with constant and decreasing photophases. No differences in the intensity of diapause, as measured by increased survival or decreased oxygen consumption, could be detected when larvae were exposed to decreasing photophases or to lower temperatures during the induction of diapause. However, after the induction of diapause, increased survival was associated with conditioning at low temperatures and with the length of this conditioning.
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