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SURVIVAL OF THE PEA APHID, ACYRTHOSIPHON PISUM (HOMOPTERA: APHIDIDAE), AT EXTREME TEMPERATURES

Published online by Cambridge University Press:  31 May 2012

J. R. Harrison
Affiliation:
Department of Biology, Carleton University, Ottawa
C. A. Barlow
Affiliation:
Department of Biology, Carleton University, Ottawa

Abstract

Immature stages of the pea aphid, Acyrthosiphon pisum (Harris), from viviparous, parthenogenetic populations, were exposed to hot and cold temperatures outside the favorable zone. Between 34.5 °C and 41.0 °C, time to 50% mortality (LT50) decreased approximately according to the relation log Y = 10.30−0.22X. From −9 °C to −12 °C, LT50 decreased rapidly and changed little with further temperature decrease to −16 °C.

Survival was affected by acclimation which was complete after 1 to 2 days. Acclimation to temperatures between 10 °C and 25 °C changed LT50 by as much as 1.3 times at 39 °C and 2 times at −12 °C.

Temperature tolerance increased with age.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1973

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