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EFFECTS OF THE STAGE OF DEVELOPMENT OF CANOLA (BRASSICA NAPUS) ON THE CAPTURE OF MOTHS IN SEX ATTRACTANT TRAPS AND ON LARVAL DENSITY OF MAMESTRA CONFIGURATA (LEPIDOPTERA: NOCTUIDAE)1

Published online by Cambridge University Press:  31 May 2012

W. J. Turnock
W. J. Turnock
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
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Abstract

The number of moths captured during short intervals in traps containing a sex attractant for males of the bertha armyworm, Mamestra configurata Wlk., is related to the stage of plant development in the fields of canola (oilseed rape, Brassica napus L.) in which the traps are placed. More moths were captured in fields with plants in the early bloom stage than in those with plants in earlier (leaf, bud) or later (late bloom, pod) stages of development. The effect of this relationship on the total number of moths captured in any field during the entire period of moth flight depended in part on the synchronization of crop development with moth flight. Neither the total number of moths captured per field nor larval density were significantly related to crop development because of high inter-field variability among groups of fields with similar patterns of crop development. Early-maturing fields contained older larvae than later-maturing fields so they should be sampled first to determine larval density and the need for insecticidal application. The estimated patterns of egg-laying were similar to those for male moth capture in early-, mid-, and late-flowering fields. Therefore, male moth captures in sex attractant traps provide a valid index to the abundance of female moths and their egg-laying activities.

Résumé

Le nombre de papillons nocturnes capturés au cours de brefs intervalles par des attractifs sexuels destinés aux mâles de la légionnaire bertha, Mamestra configurata Wlk., correspond au stade de développement des plants de colza Canola (Brassica napus L.) dans les champs où les pièges sont installés. Les pièges capturent plus de papillons lorsque le peuplement est au stade du début de la floraison que plus tôt (apparition des feuilles, bouton) ou plus tard (fin de la floraison, silique). L'effet de cette relation sur le nombre total de papillons capturés dans un champ au cours de la durée entière de l'envol dépend en partie de la synchronisation du développement de la culture et de cet envol. Ni le nombre total de papillons capturés par champ, ni la densité-larvaire ne sont significativement corrélés au développement de la culture à cause de la grande variabilité unitaire des groupes de champs présentant des modes de développement analogues. Les champs précoces contiennent des larves plus âgées que les champs tardifs de sorte qu'on doit les échantillonner en premier pour déterminer la densité larvaire et le besoin de traitement insecticide. Les courbes estimatives de ponte ressemblent à celles utilisées dans l'expérience de capture de papillons mâles dans les champs à floraison précoce, mi-saison et tardive. Les captures de papillons mâles dans les pièges aux attractifs sexuels donnent donc une bonne idée de l'abondance des papillons femelles et de leurs activités de ponte.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 4 , April 1984 , pp. 579 - 590
Copyright
Copyright © Entomological Society of Canada 1984

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