Diapause in the Swaine jack-pine sawfly, Neodiprion swainel, as influenced by temperature and photoperiod

  • Philogène B
  • Benjamin D
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Larvae of Neodiprion swainei Midd. were reared to the adult stage under temperatures of 15, 22 and 30°C and photoperiods of ( L D): 10 14, 12 12, 14 10, 16 8, 18 6 hr. Diapause was prevented when the larvae were subjected to a long photoperiod. The higher the temperature the greater the number of individuals not entering diapause at a long photoperiod. A varying percentage of individuals may enter a short diapause similar to a summer diapause. Some cocooned larvae may also stay in prolonged diapause for an undetermined period, regardless of temperature-photoperiod conditions. © 1971.

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  • Bernard J R Philogène

  • Daniel M. Benjamin

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