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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  and
C. A. Barlow
J. R. Harrison
Affiliation:
Department of Biology, Carleton University, Ottawa
C. A. Barlow
Affiliation:
Department of Biology, Carleton University, Ottawa
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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
Information
The Canadian Entomologist , Volume 105 , Issue 12 , December 1973 , pp. 1513 - 1518
Copyright
Copyright © Entomological Society of Canada 1973

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