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

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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.