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A LABORATORY TECHNIQUE TO STUDY A CHANGE IN FEEDING BEHAVIOR BETWEEN SMALL AND LARGE LARVAE OF GYPSY MOTH, LYMANTRIA DISPAR (L.)

Published online by Cambridge University Press:  31 May 2012

D.B. Roden
Affiliation:
Forestry Canada, Ontario Region, Sault Ste. Marie, Ontario, Canada P6A 5M7
J.C. Kimball
Affiliation:
Forestry Canada, Ontario Region, Sault Ste. Marie, Ontario, Canada P6A 5M7
G.A. Simmons
Affiliation:
Department of Entomology, Michigan State University, East Lansing, Michigan, USA 48824

Abstract

A change in the feeding behavior between small and large larvae of gypsy moth, Lymantria dispar (L.), is an important part of the insect’s biology. This paper describes how to build a lighting system with incandescent and fluorescent light in the laboratory to induce a change in feeding behavior similar to the change that occurs in the field. The change in feeding behavior was observed on artificial “tree stems” constructed from 5-cm ABS plastic pipe and fitted with felt and cardboard “bark flaps”. On the day before pupation began, 85% of the population migrated down the artificial tree stems to seek shelter under the bark flaps; only fourth-, fifth-, and sixth-instar larvae were observed exhibiting this behavior.

Résumé

Un élément important du cycle vital de la spongieuse (Lymantria dispar [L.]) est la modification du comportement alimentaire observable chez les larves jeunes et âgées. Le présent article décrit la façon d’aménager un système d’éclairage incandescent et fluorescent utilisable en laboratoire pour provoquer un changement de comportement alimentaire similaire à celui survenant sur le terrain. Des “troncs d’arbres” artificiels faits de tuyaux en plastique à base d’ABS de 5 cm de diamètre et recouverts de feutre et de carton en guise de “plaques d’écorce” ont été utilisés pour observer la modification du comportement alimentaire. Au cours de la journée précédant le début de la chrysalidation, 85% de la population est descendue le long des troncs d’arbres artificiels pour s’abriter sous les plaques d’écorce; seuls les 4, 5 et 6 stades larvaires modifiaient ainsi leur comportement.

[Traduit par l’auteur]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1990

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