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DIFFERENCE IN WEIGHT GAIN DURING FINAL STADIUM OF PALE WESTERN AND ARMY CUTWORMS RELATED TO LIFE HISTORY AND CROP DAMAGE1

Published online by Cambridge University Press:  31 May 2012

J.R. Byers
J.R. Byers
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, Canada T1J 4B1
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Abstract

Weight gain during the penultimate and ultimate stadia of the pale western cutworm, Agrotis orthogonia Morr., comprises about 37% and 39%, respectively, of the maximum larval weight. For the army cutworm, Euxoa auxiliaris (Grt.), the corresponding values are 20% and 69%. The proportion of final larval weight that is gained by the ultimate-instar larva of the army cutworm is similar to that reported for other noctuids, whereas the proportion gained by the ultimate-instar larva of the pale western cutworm is much lower and is likely related to the prepupal aestivation that occurs in this species. Because of the growth pattern of pale western cutworm, a substantial proportion of total food consumption, and consequently, crop damage, occurs during the penultimate stadium of this species.

Résumé

Chez le Ver-gris octogonal, Agrotis orthogonia Morr., le gain de masse au cours de l’avant-dernier stade larvaire représente 37% de la masse larvaire maximale et ce gain au cours du dernier stade, 39% de la masse larvaire totale. Chez la Légionnaire grise, Euxoa auxiliaris (Grt.), les valeurs correspondantes sont de 20% et 69%. La proportion de masse larvaire finale qui est acquise au cours du dernier stade chez la légionnaire est semblable au gain de masse qui prévaut chez d’autres noctuidés, alors que la proportion de masse acquise au cours du dernier stade chez le ver-gris est beaucoup plus faible, probablement à cause de la période d’estivation prénymphale que subit cette espèce. A cause de son rythme particulier de croissance, le Ver-gris octogonal absorbe une importante proportion de toute la nourriture qu’il consomme au cours de sa vie durant son avant-dernier stade et c’est également au cours de ce stade qu’il cause le plus de dommages aux récoltes.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 3 , June 1992 , pp. 515 - 520
Copyright
Copyright © Entomological Society of Canada 1992

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