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VISUAL STIMULI INFLUENCING ORIENTATION BY LARVAL GYPSY MOTH, LYMANTRIA DISPAR (L.)

Published online by Cambridge University Press:  31 May 2012

D.B. Roden ,
J.R. Miller  and
G.A. Simmons
D.B. Roden
Affiliation:
Forestry Canada, Ontario Region, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada P6A 5M7
J.R. Miller
Affiliation:
Department of Entomology, Michigan State University, East Lansing, Michigan, USA48824
G.A. Simmons
Affiliation:
Department of Entomology, Michigan State University, East Lansing, Michigan, USA48824
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Abstract

In laboratory and field experiments involving artificial and real tree trunks, all larval instars of gypsy moth [Lymantria dispar (L.)] crawling on a horizontal surface were influenced by the diameter, height, and species of a tree. For most larval instars, black artificial tree trunks were preferred to white trunks. The influence of the diameter and height of a host on larval attraction was examined with cardboard columns. The degree of larval attraction to a column of a certain diameter and height was positively correlated with the angle at which the column was presented. Significantly more larvae were attracted to bolts of red oak (Quercus rubra L.) than to white birch (Betula papyrifera Marsh.) or trembling aspen (Populus tremuloides Michx.). The implications of these findings and their possible effects on host colonization are discussed.

Résumé

Lors d’essais en laboratoire et sur le terrain à l’aide de troncs d’arbres artificiels et naturels, tous les stades larvaires de la spongieuse [Lymantria dispar (L.)] rampant sur une surface horizontale ont été influencés par le diamètre, la hauteur et l’essence de l’arbre. La plupart des stades larvaires ont préféré des troncs d’arbres artificiels noirs à des troncs blancs. L’influence du diamètre et de la hauteur d’un hôte sur l’attraction des larves a été étudiée à l’aide de colonnes de carton. Le degré d’attraction des larves vers une colonne d’un diamètre et d’une hauteur donnés était conélé positivement à l’angle auquel la colonne était installée. Beaucoup plus de larves étaient attirées par des fûts de chêne rouge (Quercus rubra L.) que de bouleau à papier (Betula papyrifera Marsh.) ou de peuplier faux-tremble (Populus tremuloides Michx.). L’article examine les incidences de ces constatations et leurs effets possibles sur la colonisation des hôtes.

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 2 , April 1992 , pp. 287 - 304
Copyright
Copyright © Entomological Society of Canada 1992

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