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ECONOMIC INJURY LEVELS AND ECONOMIC THRESHOLDS FOR THE GREEN APPLE BUG, LYGOCORIS COMMUNIS (KNIGHT) (HEMIPTERA: MIRIDAE), IN QUEBEC APPLE ORCHARDS
Published online by Cambridge University Press: 31 May 2012
Abstract
Economic injury levels and economic thresholds for nymphs of Lygocoris communis (Knight) were defined in apple orchards, using the beating technique. These were determined with 1987 apple market value and chemical control costs. Economic thresholds were established, assuming a 24-h period required for control implementation. Highly significant relationships were found between the damage at harvest and the captures of young nymphs of L. communis. The economic injury levels ranged from 0.4 to 5.8 young nymphs per sample unit depending on the sample unit and insecticide used.
Résumé
Des niveaux de dommage économique et des seuils économiques ont été établis en vergers de pommiers pour les larves de Lygocoris communis (Knight) en utilisant la technique du frappage des branches. Les seuils économiques ont été basés sur le coût des pesticides et la valeur des pommes de 1987 et en assumant un délai de 24 h pour l’application des pesticides. Des relations hautement significatives ont été trouvées entre le dommage à la récolte et les captures de jeunes larves de L. communis. Les niveaux de dommage économique ont varié de 0,4 à 5,8 jeunes larves par unité d’échantillonnage dépendant de l’unité d’échantillonnage et de l’insecticide utilisé.
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- Copyright © Entomological Society of Canada 1989
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