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TOXICOLOGICAL AND ELECTROPHORETIC POPULATION CHARACTERISTICS OF WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

J. L. Robertson  and
M. W. Stock
J. L. Robertson
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service U.S. Department of Agriculture, Berkeley, California 94701
M. W. Stock
Affiliation:
Department of Forest Resources, University of Maho, Moscow, Idaho 83843
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Abstract

The responses of 11 population samples of sixth-instar larvae of the western spruce budworm, Choristoneura occidentalis Freeman, to carbaryl spray were determined. Representatives of one population each from Arizona, Idaho, Montana, New Mexico, and Washington were included. Five response levels of progressively higher tolerance were apparent; the most tolerant population sample was ca. 18 times more tolerant than the most susceptible sample to carbaryl. Trends in relationships of site characteristics and response to carbaryl were not evident. Previous spray history of an area, however, appeared to be related to response at a site; populations from sites sprayed with DDT were significantly more tolerant than those from sites where DDT had not been used. The most tolerant groups were collected from a Montana population in an area where both DDT and carbaryl had been applied. The electrophoretic characteristics of each population sample were determined. No loci detectable by electrophoresis were correlated with response to carbaryl.

Résumé

On a étudié la réponse de 11 populations de larves du sixième stade de la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman, à un arrosage au carbaryl. Des individus provenant d'une population de chacun des états de l'Arizona, de l'Idaho, du Montana, du Nouveau-Mexique et de Washington étaient inclus. On a détecté cinq niveaux de tolérance croissante au carbaryl, et la population la plus tolérante s'est avérée environ 18 fois plus tolérante que celle la plus susceptible. On n'a pas observé de tendances évidentes qui duraient pu relier la réponse au traitement à des caractéristiques du milieu. Cependant, l'historique des arrosages dans la région est apparue liée à la réponse observée en un site donné : les populations ayant été arrosées au DDT se sont avérées plus tolérantes que celles provenant de sites n'ayant pas reçu de DDT. Les larves les plus tolérantes provenaient d'une population du Montana dans une région ayant reçu du DDT et du carbaryl. Les profiles électrophorétiques de chaque échantillon des populations inclues ont été établis. Aucun des loci démontrables par électrophorèse n'a pu être corrélé à la réponse au carbaryl.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 1 , January 1985 , pp. 57 - 65
Copyright
Copyright © Entomological Society of Canada 1985

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