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Seasonal Population Trends and Extensive Census Methods for Hyphantria cunea

Published online by Cambridge University Press:  31 May 2012

R. F. Morris  and
C. W. Bennett
R. F. Morris
Affiliation:
Forest Research Laboratory, Department of Forestry and Rural Development, Fredericton, New Brunswick
C. W. Bennett
Affiliation:
Forest Research Laboratory, Department of Forestry and Rural Development, Fredericton, New Brunswick
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Abstract

This is the fourth in a series of papers leading to the development of population models for Hyphantria cunea Drury in New Brunswick and Nova Scotia. In 1961 and 1962 seasonal trends were obtained for moth eclosion, larval development, nest population, parasitism, and other factors. It is concluded that one annual census of nests from a moving vehicle can provide an effective method for comparing changes in population and natural control factors over diverse climatic areas. The timing of the census in each area is important, as well as the collection of nests for data on development, colony size, parasitism, and predation.

The seasonal trends also add support to earlier hypotheses concerning the role of weather in the population dynamics of H. cunea, and reveal the nature of an important interaction between the mortality induced by weather and that induced by the main parasite, Campoplex validus Cress.

Résumé

Cet article est le quatrième d'une série qui servira à la mise au point de cartes chiffrées sur les populations de la Noctuelle d'automne (Hyphantria cunea Drury) au Nouveau-Brunswick. En 1961 et 1962, les auteurs ont enregistré les données saisonnières concernant l'éclosion de l'adulte, le développement des larves, la population des nids, le parasitisme et autres facteurs. Ils concluent qu'un recensement annuel des nids fait en se servant d'un véhicule-moteur suffit pour comparer les fluctuations de la population et les facteurs naturels de lutte observés dans les diverses régions climatiques. La période du recensement dans chaque région importe beaucoup. Il en va de même pour la récolte des nids dont on tirera des données sur le développement des insectes, les dimensions de la colonie, le parasitisme et les invasions.

L'étude des données saisonnières tend à confirmer certaines hypothèses selon lesquelles les conditions atmosphériques feraient varier la population de H. cunea. Elle permet aussi de comprendre cette interaction majeure entre le taux de mortalité induit par les conditions atmosphériques et celui qui fait suite aux infestations par Campoplex validus Cress., le principal parasite.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 1 , January 1967 , pp. 9 - 17
Copyright
Copyright © Entomological Society of Canada 1967

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References

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