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INFLUENCE OF FOLIAR NITROGEN LEVELS ON SURVIVAL, DEVELOPMENT, AND REPRODUCTION OF WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALS (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

J. Wayne Brewer ,
John L. Capinera ,
Robert E. Deshon Jr.  and
Mary L. Walmsley
J. Wayne Brewer
Affiliation:
Department of Entomology, Colorado State University, Fort Collins, Colorado 80523
John L. Capinera
Affiliation:
Department of Entomology, Colorado State University, Fort Collins, Colorado 80523
Robert E. Deshon Jr.
Affiliation:
Department of Entomology, Colorado State University, Fort Collins, Colorado 80523
Mary L. Walmsley
Affiliation:
Department of Entomology, Colorado State University, Fort Collins, Colorado 80523
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Abstract

The influence of nitrogen levels in foliage of white-fir, Abies concolor, and Douglas-fir, Pseudotsuga menziesii, seedlings on various biological characteristics of the western spruce budworm, Choristoneura occidentalis Freeman, was studied. Seedlings were grown under greenhouse conditions and provided with nutrient solutions to maintain five foliar nitrogen levels ranging from 1.29 to 4.42% dry weight for white fir and 1.43 to 3.94% for Douglas fir. Larvae confined to treated seedlings were monitored through the next generation. Larval mortality was higher, and development time longer, at both upper and lower extremes of foliar nitrogen than at mid-level. Mean pupal weight was significantly greater for larvae reared on white fir with the mid-range foliar-nitrogen level. Mean number, and weight, of eggs laid were highest when larvae fed on foliage from the mid-range nitrogen level. Total number of larvae produced was lowest at the high and low extremes of foliar nitrogen levels.

Résumé

On a étudié l'influence de la teneur en azote du feuillage de plantules de l'Abies concolor et du Pseudotsuga menziesii sur divers paramètres biologiques de la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman. Les plantules étaient gardées en serre et nourries de solutions permettant de maintenir la teneur en azote du feuillage à cinq niveaux variant de 1.29 à 4.42% pour l'A. concolor, et de 1.43 à 3.94% pour le P. menziesii. Des larves confinées à du feuillage provenant de ces traitements ont été suivies jusqu'à la prochaine génération. La mortalité larvaire s'est avérée plus élevée et la durée du développement plus longue, aux concentrations extrêmes qu'aux concentrations intermédiaires. Le poids pupal moyen était significativement plus élevé chez les larves élevées sur l'A. concolor à la concentration médiane d'azote. Le nombre et le poids moyens des oeufs pondus ont atteint leur maximum lorsque les larves se sont nourries du feuillage dont la teneur en azote était médiane. Le nombre total minimum de larves a été obtenu aux teneurs extrêmes en azote.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 1 , January 1985 , pp. 23 - 32
Copyright
Copyright © Entomological Society of Canada 1985

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