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COLD-HARDINESS OF FIRST INSTAR LARVAE OF THE FOREST TENT CATERPILLAR, MALACOSOMA DISSTRIA (LEPIDOPTERA: LASIOCAMPIDAE)

Published online by Cambridge University Press:  31 May 2012

A. G. Raske
A. G. Raske
Affiliation:
Northern Forest Research Centre, Canadian Forestry Service, Edmonton, Alberta
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Abstract

Unfed forest tent caterpillar (Malacosoma disstria Hbn.) larvae were subjected to temperature treatments of −18°, −12°, −7°, −1°, 4°, and 22 °C, each at durations of 2 days, 7 days, and 14 days. Each temperature–duration treatment was initiated 3 days before expected hatch, and 3 days after hatch. Fed larvae were subjected to identical treatments 2 days after hatch. Temperature treatments of the before hatch group resulted in appreciable mortality only at −18 °C for 7 days and at −18 °C and −12 °C for 14 days. Temperature treatments of the after hatch group resulted in nearly 100% mortality at −18 °C for all durations, at −12 °C for 14 days, and about 50% mortality at −7 °C for 14 days. Other temperature–duration combinations caused little mortality. The mortality resulting from temperature treatments of fed larvae did not differ from unfed larvae of the after hatch group.

Résumé

Des larves de la Livrée des forêts (Malacosoma disstria Hbn.) privées de nourriture furent soumises à des températures de −18°, −12°, −7°, −1°, −1°, 4° et 22 °C durant, 2, 7 et 14 jours. Chaque traitement débuta 3 jours avant l'éclosion estimée ou 3 jours après l'éclosion. Des larves nourries furent soumises à des traitements identiques deux jours après l'éclosion. A la suite du traitement, chez le groupe pré-éclosion, une mortalité appréciable se produisit seulement à −18 °C et 7 jours, et à −18 °C et −12 °C et 14 jours. Chez le groupe déjà éclos, la mortalité fut de presque 100% à −18 °C et n'importe quelle durée, et à −12 °C et 14 jours; il y eut environ 50% de mortalité à −7 °C et 14 jours. Les autres traitements causèrent peu de mortalité. La mortalité résultant de traitements de larves nourries ne différa pas de celle qui se produisit chez les larves privées de nourriture appartenant au groupe éclos.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 1 , January 1975 , pp. 75 - 80
Copyright
Copyright © Entomological Society of Canada 1975

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