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Influence of burlap-band colour on larval, pupal, and egg-mass counts of Lymantria dispar (Lepidoptera: Lymantriidae)

Published online by Cambridge University Press:  02 April 2012

David B. Roden
David B. Roden*
Affiliation:
Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen Street East, Sault Ste. Marie, Ontario, Canada P6A 5E7
*
1 Corresponding author (e-mail: droden@nrcan.gc.ca).
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Abstract

This paper describes the effect of the colour of burlap bands (black versus naturally coloured or tan burlap) affixed to red oak, Quercus rubra (L.) (Fagaceae), and how it influences selection of larval resting site, pupation site, and egg-mass counts of gypsy moth, Lymantria dispar (L.). In field experiments with half black and half tan burlap bands, the mean number of larvae, pupae, and egg masses were significantly greater under the black section of burlap. Individual burlap bands composed of either black or tan burlap affixed to separate trees produced similar significant results for larvae and pupae. When two burlap bands composed of opposite colours (black versus tan) were affixed to the same tree, significantly more larvae were found under the upper band, regardless of colour. In contrast, pupa and egg-mass densities were significantly greater under black bands, regardless of band position.

Résumé

La couleur de bandes de toile de jute (noir, nature ou marron) posées sur le tronc de chênes rouges, Quercus rubra (L.) (Fagaceae), influence le choix des sites de repos des larves et des sites de métamorphose des chrysalides, ainsi que le nombre de masses d'oeufs chez la spongieuse, Lymantria dispar (L.). Au cours d'expériences en nature dans lesquelles des bandes à moitié noires et à moitié marron ont été utilizées, le nombre moyen de larves, de chrysalides et de masses d'oeufs est significativement plus élevé sous la section noire de la jute. Des bandes individuelles de toile noire ou marron apposées à des arbres différents donnent des résultats significatifs semblables, pour ce qui est des larves et des chrysalides. Lorsque deux bandes de couleurs opposées (une noire, l'autre marron) sont apposées sur le même arbre, on retrouve significativement plus de larves sous la bande supérieure, indépendamment de sa couleur. Par ailleurs, les chrysalides et les masses d'oeufs sont significativement plus nombreuses sous la bande noire, indépendamment de sa position.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 135 , Issue 6 , December 2003 , pp. 869 - 877
Copyright
Copyright © Entomological Society of Canada 2003

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