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EFFECTS OF TEMPERATURE, SEX, AND GENETIC BACKGROUND ON COLORATION OF CHORISTONEURA SPP. (LEPIDOPTERA: TORTRICIDAE) POPULATIONS IN SOUTH-CENTRAL OREGON

Published online by Cambridge University Press:  31 May 2012

W. J. A. Volney ,
A. M. Liebhold  and
W. E. Waters
W. J. A. Volney
Affiliation:
Division of Entomology and Parasitology, University of California, Berkeley 94720
A. M. Liebhold
Affiliation:
Division of Entomology and Parasitology, University of California, Berkeley 94720
W. E. Waters
Affiliation:
Division of Entomology and Parasitology, University of California, Berkeley 94720
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Abstract

Coloration of larval, pupal, and adult progeny of Choristoneura spp. collected from Pseudotsuga menziesii (Mirb.) Franco and Abies concolor (Gord. & Glend.) Lindl. in south-central Oregon depended on the temperature at which the insects were reared. Sex and genetic background were also major sources of variation in coloration. Many of the characters which varied with temperature were thought to be of value in distinguishing C. occidentalis Freeman from C. retiniana (Walsingham). The association between a combination of larval characters and a combination of adult forewing maculations, though weak, allows a calculation of the probability that an adult belongs to a certain lineage defined by larval features. Individuals from mixed families were particularly difficult to categorize because of the variation encountered and the sensitivity of their appearance to rearing temperature. The biological significance of this variation and its implications to pest management are discussed.

Résumé

La coloration des larves, pupes et adultes de la progéniture de Choristoneura spp. collectionnées sur Pseudotsuga menziesii (Mirb.) Franco et Abies concolor (Gord. & Glend.) Lindl. au sud central de l'Oregon s'est révélée dépendante de la température d'élevage des insectes. Le sexe et la souche génétique sont aussi apparus comme sources importantes de variation de la couleur. Plusieurs caractères variant avec la température sont apparus utiles pour distinguer C. occidentalis Freeman de C. retiniana (Walsingham). Une certaine association entre un ensemble de caractères larvaires et une combinaison de taches sur l'aile avant de l'adulte, bien que faible, permet d'évaluer la probabilité qu'un adulte appartienne à une souche donnée définie par ses caractères larvaires. Les individus provenant de familles mixtes se sont avérés très difficiles à classifier dû à la variation observée et à la sensibilité de leur apparence à la température d'élevage. La signification biologique de cette variation et ses implications pour la lutte font l'objet de la discussion.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 12 , December 1983 , pp. 1583 - 1596
Copyright
Copyright © Entomological Society of Canada 1983

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