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EFFECTS OF REMOVING THE PLANT CANOPY ON PUPAL SURVIVAL AND ADULT EMERGENCE OF THE ALFALFA BLOTCH LEAFMINER, AGROMYZA FRONTELLA (DIPTERA: AGROMYZIDAE)1

Published online by Cambridge University Press:  31 May 2012

Pierre Therrien  and
Jeremy McNeil
Pierre Therrien
Affiliation:
Département de biologie, Université Laval, Québec, Québec GlK 7P4
Jeremy McNeil
Affiliation:
Département de biologie, Université Laval, Québec, Québec GlK 7P4
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Abstract

Early removal of the alfalfa canopy not only reduced the population density of Agromyza frontella (Rond.) by the elimination of partially developed larvae, but also by increasing mortality of individuals that had already evacuated their mines. This mortality was associated with increased temperatures and/or decreased humidity of the soil, as most pupae are found close to the surface due to the limited burrowing capacity of prepupae. Harvesting data should be included in predictive models, as this parameter affects both the number and time of adult emergence.

Résumé

La coupe hâtive de la luzerne a pour effet de réduire la densité de population d'Agromyza frontella (Rond.) en éliminant non seulement les larves partiellement développées, mais aussi en augmentant la mortalité pupale chez les individus qui ont déjà quitté les mines. Cette mortalité a été associée à l'augmentation des températures et/ou à la diminution de l'humidité du sol, étant donné que la majorité des pupes reste près de la surface, dû à la capacité limitée d'enfouissement des prépupes. Les dates de coupes devraient donc être incluses dans les modèles de prédiction, car ce paramètre affecte à la fois le nombre et le temps d'émergence des adultes.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 2 , February 1985 , pp. 167 - 170
Copyright
Copyright © Entomological Society of Canada 1985

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