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EFFICACY OF DIFLUBENZURON AGAINST THE CODLING MOTH, LASPEYRESIA POMONELLA (LEPIDOPTERA: OLETHREUTIDAE), AND IMPACT ON ORCHARD MITES

Published online by Cambridge University Press:  31 May 2012

D. W. Anderson  and
R. H. Elliott
D. W. Anderson
Affiliation:
Department of Plant Science, University of British Columbia, Vancouver V6T 2A2
R. H. Elliott
Affiliation:
Department of Plant Science, University of British Columbia, Vancouver V6T 2A2
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Abstract

The efficacy of diflubenzuron against the codling moth, Laspeyresia pomonella L., was compared with that of azinphos-methyl in two orchards. Two cover sprays were applied to coincide with peak codling moth activity which was monitored daily with pheromone-baited traps. In the Golden Delicious and mixed cultivar orchards, 187 ppm (mg active ingredient/1.) diflubenzuron provided control comparable to that of 187 ppm azinphos-methyl. In the 47 ppm diflubenzuron treatment, more fruit damage occurred particularly in the mixed cultivar orchard. In this orchard, the addition of Tween 20 to the spray mixture reduced fruit damage markedly.

Diflubenzuron appeared non-toxic to the phytoseiid Typhlodromus occidentalis Nesbitt and stigmaeid Zetzellia mali Ewing. In addition, cover sprays did not increase populations of European red mite, Panonychus ulmi (Koch) or rust mites, Aculus spp.

The efficacy of diflubenzuron against the codling moth and its compatability with integrated mite control suggest that the compound is a promising agent for pest management programs in apple orchards.

Résumé

L'efficacité du diflubenzuron contre le carpocapse de la pomme, Laspeyresia pomonella L., a été comparée à celle de l'azinphos-méthyle dans 2 vergers. Deux arrosages de couverture ont été appliqués de façon à coincider avec le maximum d'activité du carpocapse, laquelle a été suivie journalièrement à l'aide de pièges à phéromone. Dans les vergers de "Golden Delicious" et les vergers de cultivars mixtes, un traitement à 787 ppm (mg d'ingrédient actif/1.) de diflubenzuron a permis un contrôle comparable à celui obtenu avec 187 ppm d'azinphos-méthyle. Pour le traitement avec 47 ppm de diflubenzuron, plus de dommage fût observé particulièrement dans le verger à cultivars mixtes. Dans ce verger, l'addition de Tween 20 au mélange d'arrosage a réduit le dommage de façon marquée.

Le diflubenzuron est apparu non-toxique pour le phytoseiide Typhlodromus occidentalis Nesbitt et le stigmaeide, Zetsellia mali Ewing. De plus, les arrosages de couverture n'ont pas fait augmenter les populations de tétranyque rouge au pommier, Panonychus ulmi (Koch) ou des acariens Aculus spp.

L'efficacité du diflubenzuron contre le carpocapse et sa compatibilité avec la lutte intégrée contre les acariens permettent de croire qu'il s'agit d'un produit prometteur pour les programmes de lutte contre les nuisibles en vergers.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 8 , August 1982 , pp. 733 - 737
Copyright
Copyright © Entomological Society of Canada 1982

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