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NUMBER AND SIZE OF EGGS IN EGG MASSES OF THE WESTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

Robert W. Campbell ,
Torolf R. Torgersen  and
Nilima Srivastava
Robert W. Campbell
Affiliation:
USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Corvallis, Oregon 97331
Torolf R. Torgersen
Affiliation:
USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, La Grande, Oregon 97850
Nilima Srivastava
Affiliation:
College of Forestry, Wildlife and Range Sciences, University of Idaho, Moscow, Idaho 83843
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Abstract

Foliage of Douglas-fir and grand fir bearing egg masses of the western spruce budworm, Choristoneura occidentalis Freeman, was collected from sites in Oregon, Idaho, and Montana. Later, 4154 of these egg masses were examined in the laboratory. The average number of eggs per mass was 47.5 ± 10.65 (range 23–58). The number of eggs in a mass increased as defoliation of current foliage increased from none to moderate. The average number of eggs per linear millimeter of a single row ranged among sites from 1.24 ± 0.02 to 2.43 ± 0.21. The average number of eggs per linear millimeter of a row was highest (1.99) among the sites studied in Idaho, and lowest (1.58) among the sites studied in Oregon.

Résumé

Du feuillage du sapin de Douglas et du sapin de Vancouver portant des masses d'oeufs de la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman, a été recueilli à plusieurs endroits en Oregon, en Idaho et au Montana. Par la suite, 4,154 de ces masses ont été examinées au laboratoire. Le nombre moyen d'oeufs par masse était de 47.5 ± 10.65 (écart 23–58). Le nombre d'oeufs par masse a augmenté pendant que la défoliaison du feuillage courant est passée de nulle à modérée. Le nombre moyen d'oeufs par millimètre linéaire d'une rangée simple a varié de 7.24 ± 0.02 à 2.43 ± 0.21 entre ces sites. Parmi les sites étudiés le nombre moyen d'oeufs par millimètre linéaire de rangée était maximum (1.99) en Idaho, et minimum (1.58) pour les sites étudiés en Oregon.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 5 , May 1984 , pp. 657 - 661
Copyright
Copyright © Entomological Society of Canada 1984

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