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TIMING OF INSECTICIDE APPLICATIONS FOR THE CONTROL OF THE COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA (SAY), (COLEOPTERA: CHRYSOMELIDAE), ON POTATOES IN NEW BRUNSWICK

Published online by Cambridge University Press:  31 May 2012

G. Boiteau
Affiliation:
Agriculture Canada Research Station, PO Box 20280, Fredericton, New Brunswick, Canada E3B 427

Abstract

Different insecticide spray regimes were tested in 1984, 1985, and 1986 to determine the optimal time to control the Colorado potato beetle, Leptinotarsa decemlineata (Say), on Russet Burbank potatoes in New Brunswick. Insecticides applied in mid-July at the peak of larval abundance when plants were entering into bloom had the greatest efficacy in controlling beetles and protecting the yield. A single insecticide application at 50% bloom was 12–17% and 82–95% more effective than one application at bloom and full growth, respectively.

Résumé

Différents programmes d’arrosage insecticide furent utilisés en 1984, 1985 et 1986 pour déterminer la période idéale au contrôle du doryphore de la pomme de terre, Leptinotarsa decemlineata (Say), sur la variété Russet Burbank au Nouveau-Brunswick. Les traitements appliqués à la mi-juillet au moment où les larves étaient les plus abondantes et les plantes entraient en floraison produisirent le meilleur contrôle des doryphores et la meilleure protection du rendement. Une seule application d’insecticide au moment où 50% des plantes étaient en floraison fut 12–17% et 82–95% plus efficace qu’une application pendant la pleine floraison ou à la maturité du plant, respectivement.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1988

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References

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