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OCCURRENCE OF CYHEXATIN AND DICOFOL RESISTANCE IN THE EUROPEAN RED MITE, PANONYCHUS ULMI (KOCH) (ACARI: TETRANYCHIDAE), IN SOUTHERN ONTARIO

Published online by Cambridge University Press:  31 May 2012

D.J. Pree  and
H.W. Wagner
D.J. Pree
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
H.W. Wagner
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
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Abstract

Laboratory bioassays showed the occurrence of 8.5-fold resistance to cyhexatin and ca. 15-fold resistance to dicofol in laboratory-selected populations of European red mite (Panonychus ulmi (Koch)). Surveys, in 1984, of 45 orchards, using field-collected mites exposed to discriminating concentrations of cyhexatin or dicofol, detected resistance to cyhexatin in ca. 29% of the populations. Resistance to dicofol was identified in 2 of 45 assays.

Résumé

Des dosages biologiques en laboratoire ont révélé que des populations de tétranyque rouge du pommier (Panonychus ulmi (Koch)) sélectionnées en laboratoire résistaient 8,5 fois plus à la cyhexatine et environ 15 fois plus au dicofol. Les enquêtes effectuées en 1984 dans 45 vergers sur des tétranyques récoltées au champ et exposées à diverses concentrations de cyhexatine ou de dicofol ont permis de détecter une résistance à la cyhexatine chez 29% environ de la population. La résistance au dicofol a été identifiée dans 2 essais sur 45.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 3 , March 1987 , pp. 287 - 290
Copyright
Copyright © Entomological Society of Canada 1987

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