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Biol Bull 124: 84-96. (February 1963)
© 1963 Marine Biological Laboratory
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PHOTOPERIODIC TERMINATION OF DIAPAUSE IN AN INSECT

D. G. R. MCLEOD 1 and STANLEY D. BECK 1

1 Department of Entomology, University of Wisconsin, Madison 6, Wisconsin

1. The European corn borer, Ostrinia nubilalis, has a faculative diapause in the last larval instar. Diapause induced in the laboratory by a short-day photoperiod is identical in its intensity to that occurring in the field.

2. Diapause development occurs at 30° C. under various photoperiodic conditions but is greatly accelerated by a long day.

3. Completion of diapause development does not require a period of chilling.

4. Diapause development is a process that removes a block to secretion of the activation hormone but does not include secretion or any of the morphogenic events that follow.






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