Canadian Forest Service Publications

Influence of temperature on prespinning eonymphs of the Swaine jack pine sawfly, Neodiprion swainei Midd. (Hymenoptera : Diprionidae) 1964. Pilon, J.G. Can. Ent. 96(11): 1450-1457.

Year: 1964

Issued by: Laurentian Forestry Centre

Catalog ID: 15734

Language: English

Availability: PDF (request by e-mail)

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Laboratory experiments at various constant temperatures indicate a theoretical threshold of about 40°F. for spinning of cocoons by eonymphal larvae of Neodiprion swainei Midd. As temperatures fall below 52.S°F. the increase in mortality and time required to spin is pronounced. The optimum temperature is estimated to he around 60°F. Field investigations for three consecutive years show a close correlation between rare of spinning and temperature. Temperature is considered as a prime factor influencing the spinning of cocoons and is possibly one of the more important factors governing the population dynamics of N. swainei in the Province of Quebec.