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DEVELOPMENTAL ADAPTATION OF THE EUROPEAN CORN BORER (OSTRINIA NUBILALIS HÜBNER) IN ALBERTA

Published online by Cambridge University Press:  31 May 2012

Dennis A. Lee
Affiliation:
Department of Entomology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3
John R. Spence
Affiliation:
Department of Entomology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3

Abstract

Temperature effects on development were studied for two Alberta populations of Ostrinia nubilalis (Hübner), from the South Saskatchewan River valley and the surrounding plains. Lower developmental thresholds for all life stages of both Alberta populations were determined by linear regression. Thresholds for the egg stage were significantly less for plains borers (9.5°C) than for valley borers (10.8°C), and about 2°C lower than for corn borers from the United States. Thresholds in Alberta populations for the 4th (15.3°C) and 5th (14.0°C, plains) instars, and for post-diapause pupation (12.8°C), were much higher than in populations from the United States. Higher temperature thresholds delay development in Alberta populations, thus reducing midsummer pupation. Valley populations developed significantly faster than plains populations during egg development, during the prepupal period of the 5th instar, and during post-diapause pupation. These results explain why valley populations have a partial second generation in some years.

Résumé

On a étudié les effets de la température sur le développement de deux populations de la pyrale du maïs, Ostrinia nubilalis (Hübner), provenant de la vallée de la rivière Saskatchewan Sud et des plaines environnantes en Alberta. On a déterminé les seuils thermiques inférieurs du développement de tous les stades des deux populations par régression linéaire. Les seuils du développement de l’oeuf étaient significativement plus bas pour la pyrale des plaines (9,5°C) que celle de la vallée (10,8°C), et environ 2°C plus bas que celui de pyrale des États-Unis. Les seuils des populations albertaines pour les 4ième (15,3°C) et 5ième (14,0°C, plaines) stades, et pour la pupaison post-diapause (12,8°C), étaient bien supérieurs à ceux des populations des États-Unis. Ces seuils thermiques plus élevés des populations albertaines retardent leur développement, réduisant ainsi la pupaison mi-estivale. Les populations de la vallée se sont développées significativement plus vite que celles des plaines au stade d’oeuf, durant la période prépupale du 5ième stade, et durant la pupaison post-diapause. Ces résultats expliquent le fait que les populations de la vallée montrent une seconde génération partielle lors de certaines années.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1987

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