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NUMERICAL RESPONSE OF COCCINELLIDS TO APHIDS IN CORN IN SOUTHERN ONTARIO1

Published online by Cambridge University Press:  31 May 2012

E. Jane Wright  and
J. E. Laing
E. Jane Wright
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
J. E. Laing
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
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Abstract

Populations of two abundant coccinellid species, Coleomegilla maculata lengi Timberlake and Hippodamia tredecimpunctata tibialis Say, responded rapidly to corn leaf aphid populations [Rhopalosiphum maidis (Fitch)] once the aphids became exposed to predation when the plants tasselled. Coleomegilla m. lengi oviposited at lower densities of aphids than did H. t. tibialis but H. t. tibialis was shown to have a greater numerical response than C. m. lengi at high densities of aphids due to its greater fecundity. The numerical response of the coccinellids by oviposition was linear with a lag of 1/2 week behind the aphid population.

Résumé

Les populations de deux espèces abondantes de coccinelles, Coleomegilla maculata lengi Timberlake et Hippodamai tredecimpunctata tibialis Say, ont répondu rapidement aux populations du puceron du maïs [Rhopalosiphum maidis (Fitch)] une fois que les pucerons devinrent exposés à la prédation lors de la sortie de la panicule. C. m. lengi a pondu à des densités de pucerons plus faibles que H. t. tibialis, cependant H. t. tibialis a montré une réponse numérique plus forte que C. m. lengi aux densités élevées de pucerons, dû à sa fécondité plus élevée. La réponse numérique de ponte des coccinelles s’est révélée linéaire avec un retard d’une demi-semaine sur la population de pucerons.

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 10 , 01 October 1980 , pp. 977 - 988
Copyright
Copyright © Entomological Society of Canada 1980

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