Periodicity in Oviposition of Ostrinia Nubilalis (HBN.) (Lepidoptera: Pyraustidae)
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Citation:The Ohio Journal of Science. v66 n1 (January, 1966), 76-80
A perfect 24-hr rhythm was found in the oviposition of European corn borer moths exposed to the fluctuations of the natural environment, with a peak of egg laying at 10 pm Central Standard Time. On the other hand, corn borer moths held in constant darkness with unchanging temperature and humidity deposited eggs during the entire 24-hr daily period. However, a circadian rhythm in oviposition was revealed by regular peaks of maximal egg laying. There was a coincidence of the peaks of maximum oviposition in both groups of experimental insects at the start and at the end of their adult lives. During the middle portion of the adult lives of the insects held under constant conditions, the peak of oviposition varied from that of insects exposed to natural environmental conditions. In addition to the circadian variations, there appears to exist also a relatively precise 24-hr. rhythm, which ay or may not be intrinsically timed.
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