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RELATION OF MORTALITY CAUSED BY PARASITES TO THE POPULATION DENSITY OF HYPHANTRIA CUNEA

Published online by Cambridge University Press:  31 May 2012

R. F. Morris
R. F. Morris
Affiliation:
Maritimes Forest Research Centre, Canadian Forestry Service, Fredericton, New Brunswick
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Abstract

Parasitism in natural populations of Hyphantria cunea Drury was measured in New Brunswick and Nova Scotia, 1957–1973. Thirteen parasite species were recovered during this period but only a few caused an appreciable degree of mortality. The per cent mortality showed an immediate rather than a delayed response to host density, the relationship being direct up to a density of about 10 host colonies per mile, then inverse. Possible reasons for this sort of relationship are discussed.

Résumé

On a mesuré le parasitisme au sein des populations naturelles de la noctuelle d’automne (Hyphantria cunea Drury) au Nouveau-Brunswick et en Nouvelle-Écosse, entre 1957 et 1973. Au cours de cette période, on a relevé treize espèces de parasites mais quelques espèces seulement ont causé un degré de mortalité appréciable. Le pourcentage de mortalité a démontré une réaction immédiate plutôt que retardée selon la densité des hôtes, le rapport étant direct pour une densité allant jusqu’à 10 colonies d’hôtes par mille de distance, et inversement par la suite. L’auteur résume ici les raisons possibles de ce genre de rapport.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 11 , November 1976 , pp. 1291 - 1294
Copyright
Copyright © Entomological Society of Canada 1976

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References

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