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EFFECTIVENESS OF MICROBIAL AND CHEMICAL INSECTICIDES IN CONTROL OF THE COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE) ON POTATOES AND TOMATOES

Published online by Cambridge University Press:  31 May 2012

Robert P. Jaques  and
Daniel R. Laing
Robert P. Jaques
Affiliation:
Agriculture Canada Research Station, Harrow, Ontario, Canada N0R 1G0
Daniel R. Laing
Affiliation:
Agriculture Canada Research Station, Harrow, Ontario, Canada N0R 1G0
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Abstract

The control of the Colorado potato beetle, Leptinotarsa decemlineata (Say), by formulations of Bacillus thuringiensis (Berliner) (B.t.) and other microbial agents and chemical insecticides was assessed in field plots of potatoes and tomatoes over a 5-year period. Applications of formulations of thuringiensin, the beta exotoxin of B.t., and of B.t. var. son diego (B.t.sd.) to potatoes reduced numbers of larvae of the potato beetle compared with the nontreated check and resulted in yields significantly greater than from the check plots and, in most cases, similar to yields from plots treated with carbofuran. Treatment of tomatoes with B.t.sd. reduced populations of larvae of the Colorado potato beetle compared with the nontreated check and increased yield of nondamaged fruit from plots. An initial application of carbofuran to potatoes or permethrin to tomatoes followed by applications of thuringiensin or B.t.sd. protected potatoes or tomatoes as well as did the chemical insecticide used alone in a treatment program. Applications of preparations of B.t. var. kurstaki or spores of the fungus Beauveria bassiana (Balsamo) Vuillemin or the microsporidium Vairimorpha necatrix (Kramer) did not reduce populations of the beetle.

Résumé

Au cours d’essais effectués sur des parcelles expérimentales de pommes de terre et de tomates, les auteurs ont éprouvé, sur une période de 5 ans, l’efficacité des préparations à base de Bacillus thuringiensis (Berliner) (B.t.) et d’autres agents microbiens ainsi que des insecticides chimiques comme moyen de lutte contre le doryphore de la pomme de terre, Leptinotarsa decemlineata (Say). Le traitement des pommes de terre à l’aide de la β-exotoxine de B.t. et de formulations à base de B.t. var. san diego (B.t.sd.) a permis de réduire le nombre de larves du doryphore en regard des résultats des parcelles témoins et d’obtenir des rendements supérieurs à ceux observés dans ces dernières et, dans la plupart des cas, comparables à ceux des parcelles traitées au carbofuran. L’application de préparations à base de B.t.sd. sur les tomates a entraîné une baisse du nombre de larves du doryphore par rapport aux résultats des parcelle non traitées et a accru le rendement en fruits non endommagés. Une application initiale de carbofuran sur les pommes de terre ou de perméthrine sur les tomates suivie d’applications de B.t.sd. ou de β-exotoxine de B.t. s’est révélée aussi efficace pour la protection des pommes de terre et des tomates que l’emploi d’insecticides chimiques uniquement. Des applications de préparations à base de B.t. var. kurstaki ou de spores du champignon Beauveria bassiana (Balsamo) Vuillemin ou de microsporidies Vairimorpha necatrix (Kramer) n’ont pas réduit la population de doryphore.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 12 , December 1988 , pp. 1123 - 1131
Copyright
Copyright © Entomological Society of Canada 1988

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