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THE POTENTIAL FOR ESTABLISHMENT OF THE EGG PARASITE OOENCYRTUS KUWANAI IN ONTARIO POPULATIONS OF THE GYPSY MOTH

Published online by Cambridge University Press:  31 May 2012

K.J. Griffiths  and
C.R. Sullivan
K.J. Griffiths
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre Sault Ste. Marie, Ontario P6A 5M7
C.R. Sullivan
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre Sault Ste. Marie, Ontario P6A 5M7
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Abstract

The overwintering adult of Ooencyrtus kuwanai (How.) is susceptible to freezing. Male adults from New Jersey have a mean supercooling point of −9.6 ± 0.37°C, significantly higher than those from Maine (−12.3 ± 1.08°). Neither group had its cold hardiness increased by exposure to sublethal temperatures. Female adults from New Jersey had a mean supercooling point of −10.8 ± 0.69° when tested after rearing at 22°C, again significantly higher than that of similarly treated female adults from Maine (−15.4 ± 0.90°). Exposure of New Jersey females to sublethal temperatures decreased their supercooling point significantly, to −14.5 ± 1.59°. Maine female adults were not tested after that treatment. No adults survived continuous exposure to 0°C for 30 days. Hence this parasite is apparently incapable of surviving in the current range of the gypsy moth in Canada.

Résumé

L’Ooencyrtus kuwanai (How.) adulte est vulnérable au gel pendant son hibernation. Les mâles adultes du New Jersey ont un point moyen de surcongélation de −9.6 ± 0.37°C, significativement plus élevé que ceux du Maine (−12.3 ± 1.08°C). Aucun des deux groupes n’a augmenté sa résistance au froid lorsque exposé à des températures subtlétales. Les femelles adultes du New Jersey avaient un point moyen de surcongélation de −10.8 ± 0.69° lors d’un test suivant leur élevage à 22°C, encore une fois significativement plus élevé que chez les femelles adultes du Maine (−15.4 ± 0.90°), ayant subi le même test. Les femelles adultes du New Jersey, exposées à des températures subtlétales ont vu descendre significativement leur point de surcongélation, à −14.5 ± 1.59°. Les femelles adultes du Maine n’ont pas été vérifiées après ce dernier traitement. Aucun adulte n’a survécu après une exposition continue à 0°C pendant 30 jours. Ainsi donc, ce parasite semble incapable de survivre sur le territoire actuel de la Spongieuse au Canada.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 6 , 01 June 1978 , pp. 633 - 638
Copyright
Copyright © Entomological Society of Canada 1978

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