Canadian Forest Service Publications

Diapause in the Swaine jack-pine sawfly, Neodiprion swainei, as influenced by temperature and photoperiod. 1971. Philogène, B.J.R.; Benjamin, D.M. J. Insect Physiol. 17: 1711-1716.

Year: 1971

Issued by: Laurentian Forestry Centre

Catalog ID: 15729

Language: English

Availability: PDF (request by e-mail)

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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.