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LIFE HISTORY AND SEASONAL DEVELOPMENT OF THE WESTERN WINTER MOTH, OPEROPHTERA OCCIDENTALS (LEPIDOPTERA: GEOMETRIDAE), IN WESTERN OREGON1

Published online by Cambridge University Press:  31 May 2012

Jeffrey C. Miller  and
Jan E. Cronhardt
Jeffrey C. Miller
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon 97331
Jan E. Cronhardt
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon 97331
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Abstract

In western Oregon, Operophtera occidentalis (Hulst) has four larval instars, is univoltine, and polyphagous. Adult activity peaked in early December, eggs overwintered, larvae were present from March to June, and pupae from May to December. Temperature thresholds for egg and larval development were estimated to be 2 °C. Few species of natural enemies were observed and rates of parasitism averaged 2%.

Résumé

Dans l'ouest de l'Oregon, Operophtera occidentalis (Hulst) passe par 4 stades larvaires, est univoltine et polyphage. L'activité des adultes est passée par un sommet tôt en décembre, les oeufs ont hiverné, les larves ont été observées de mars à juin et les chrysalides de mai à décembre. Les seuils thermiques pour le développement de l'oeuf et le développement larvaire ont été estimés à 2 °C. Peu d'espèces d'ennemis naturels ont été observées et les incidences de parasitisme étaient de 2% en moyenne

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 7 , July 1982 , pp. 629 - 636
Copyright
Copyright © Entomological Society of Canada 1982

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