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POPULATION STUDIES OF PHYTOPHAGOUS MITES AND PREDATORS ON APPLE IN SOUTHWESTERN QUEBEC

Published online by Cambridge University Press:  31 May 2012

B. Parent
B. Parent
Affiliation:
Research Station, Canada Department of Agriculture, Saint-Jean, Quebec
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Abstract

Ecological studies, undertaken to determine the fluctuations of phytophagous mites and predators in apple orchards, were conducted in 1955, 1956, and 1957 at Rougemont, Que., in two plots sprayed only with fungicides for the control of apple scab, Venturia inaequalis (Cke) Wint., and in a third one sprayed, in addition to fungicides, with all insecticides needed for the control of destructive insects. Phytophagous mites were more numerous in the plot sprayed with insecticides than in plots sprayed only with fungicides, and densities of the mites in the latter plots were inversely proportional to densities of predators. A similar relationship existed in the insecticide plot between the amount of chemicals used and numbers of predators present. The principal mite predators were Typhlodromus rhenanus (Oudms.), most effective against the two-spotted spider mite, Tetranychus urticae Koch, and Mediolata mali (Ewing), most effective against the European red mite, Panonychus ulmi (Koch).

Résumé

Des études écologiques furent poursuivies en 1955, 1956 et 1957 à Rougemont, Qué., en vue de déterminer les fluctuations des populations de tétranyques phytophages et de leurs prédateurs dans les vergers. Le travail fur effectue dans trois parcelles expérimentales dont deux étaient traitées exclusivement avec des fongicides pour la répression de la tavelure du pommier, Venturia inaequalis (Cke) Wint., et une troisième, avec tous les pesticides nécessaires à la répression des maladies et des insectes nuisibles. Les tétranyques phytophages étaient beaucoup plus nombreux dans la parcelle traitée avec insecticides et fongicides que dans les parcelles n'ayant reçu que des fongicides. Les densités des populations de prédateurs et celles des tétranyques phytophages étaient inversement proportionnelles, et la même relation existait entre les traitements insecticides et les populations de prédateurs. Les principaux acariens prédateurs étaient Typhlodromus rhenanus (Oudms.), particulièrement efficace contre le tétranyque à deux points, Tetranychus urticae Koch, et Mediolata mali (Ewing), qui préférait le tétranyque rouge du pommier, Panonychus ulmi (Koch).

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 7 , July 1967 , pp. 771 - 778
Copyright
Copyright © Entomological Society of Canada 1967

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