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EFFECT OF FORMICA OBSCURIPES (HYMENOPTERA: FORMICIDAE) ON THE PREDATOR–PREY RELATIONSHIP BETWEEN HYPERASPIS CONGRESSIS (COLEOPTERA: COCCINELLIDAE) AND TOUMEYELLA NUMISMATICUM (HOMOPTERA: COCCIDAE)

Published online by Cambridge University Press:  31 May 2012

G. A. Bradley
G. A. Bradley
Affiliation:
Canadian Forestry Service, Department of the Environment, Ottawa
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Abstract

The scale insect Toumeyella numismaticum Pettit and McDaniel occurred in small areas of heavy infestation in jack pine, Pinus banksiana Lamb., stands of southeastern Manitoba, where it was present in the same areas every year. The large populations of Formica obscuripes Forel present in the scale-infested areas lessened the effectiveness of the main predator of the scale, the coccinellid Hyperaspis congressis Watson, through interference with the Hyperaspis adults.

Résumé

Le Kermès-tortue du Pin, Toumeyella numismaticum, ravage fortement de petites superficies isolées dans les peuplements de Pin gris, Pinus divaricata (Pinus banksiana) dans le sud-est du Manitoba. Il se retrouve d’une année à l’autre aux mêmes endroits. L’auteur trouva que les fortes populations de Formica obscuripes trouvées avec les Kermès-tortues du Pin diminuaient l’efficacité du principal prédateur des Kermès-tortues du Pin : la Coccinelidée Hyperaspis congressis vu que leur action intefère avec celle des adultes d’Hyperaspis.

Type
Articles
Information
The Canadian Entomologist , Volume 105 , Issue 8 , August 1973 , pp. 1113 - 1118
Copyright
Copyright © Entomological Society of Canada 1973

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References

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