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Desiccation resistance in pre-diapause, diapause and post-diapause larvae of Choristoneura fumiferana (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  09 March 2007

É Bauce  and
E. Han
É Bauce*
Affiliation:
Facultéde foresterie et de géomatique, CRBF, Université Laval, Ste-Foy (Québec), G1K 7P4, Canada
E. Han
Affiliation:
Facultéde foresterie et de géomatique, CRBF, Université Laval, Ste-Foy (Québec), G1K 7P4, Canada
*
*Fax: (418) 656 3677 E-mail: [email protected]
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Abstract

Desiccation resistance was examined in pre-diapause, diapause and post-diapause larvae of the spruce budworm, Choristoneura fumiferana (Clemens), in terms of passive water evaporation under three desiccation conditions: freeze-drying, desiccant-drying at 2°C and desiccant-drying 18°C. Diapausing second instar larvae and post-diapause non-feeding second instar larvae showed strongest desiccation resistance: a significant amount of water was retained after repeated drying under desiccating conditions, while pre-diapause first instar larvae and post-diapause feeding instar larvae lost almost all their water content after one or two drying cycles. A hibernaculum covering had no effect on water evaporation. While dead larvae tended to lose significantly more water than their living counterparts, particularly among first instar larvae, such an impact much weaker among diapausing second instar larvae. Desiccation resistance was lost when post-diapause second instar larvae were allowed access to water while the level of desiccation resistance was maintained or enhanced when the larvae did not have access to water. These results are discussed the context of overwintering ecology of the species and possible mechanisms for the desiccation resistance are also discussed.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 91 , Issue 5 , October 2001 , pp. 321 - 326
Copyright
Copyright © Cambridge University Press 2001

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