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AN APPROACH TO MEASURING CHANGES IN THE REPRODUCTION OF SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) FIELD POPULATIONS FROM SURVEY DATA

Published online by Cambridge University Press:  31 May 2012

C. A. Miller
C. A. Miller
Affiliation:
Maritimes Forest Research Centre, Canadian Forestry Service, Fredericton, New Brunswick E3B 5P7
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Abstract

Survey counts of spruce budworm, Choristoneura fumiferana (Clem.), female pupae, and eggs recorded annually at about 1000 sample points in New Brunswick from 1960 to 1975 provided ratios of eggs to females (E/F ratios) which are a measure of apparent reproduction. The 10-fold variation in the ratios was inversely associated with the frequency of July storm tracks. A positive relationship between E/F ratios and changes in the area of the budworm infestation in the province was also shown.

Résumé

De 1960 à 1975, on compta les pupes femelles et les œufs de la Tordeuse, Choristoneura fumiferana (Clem.) à tous les ans dans environ 1000 places-échantillons au Nouveau-Brunswick. Par la suite, on établit les rapports œufs-femelles (rapports O/F). Après analyse de ces données, l’auteur trouva une variation, variant 10 fois, de la reproduction apparente des populations, ce qui peut partiellement être expliqué par les conditions de météo (la fréquence des orages en juillet). Il établit une relation entre les rapports O/F et les variations annuelles d’importances des infestations par la Tordeuse dans la province.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 3 , March 1979 , pp. 309 - 316
Copyright
Copyright © Entomological Society of Canada 1979

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References

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