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MANAGEMENT OF LATE-SEASON ADULTS OF THE COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE) WITH ENTOMOPATHOGENIC NEMATODES

Published online by Cambridge University Press:  31 May 2012

Jeff G. Stewart ,
Gilles Boiteau  and
Joe Kimpinski
Jeff G. Stewart*
Affiliation:
Agriculture and Agri-Food Canada Research Centre, P.O. Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8
Gilles Boiteau
Affiliation:
Agriculture and Agri-Food Canada Research Centre, P.O. Box 20280, Fredericton, New Brunswick, Canada E3B 4Z7
Joe Kimpinski
Affiliation:
Agriculture and Agri-Food Canada Research Centre, P.O. Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8
*
1 Author to whom all correspondence should be addressed
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Abstract

The susceptibility of Colorado potato beetle [Leptinotarsa decemlineata (Say), Coleoptera: Chrysomelidae] to entomopathogenic nematodes (Steinernema carpocapsae, ’All’ strain, Nematoda: Heterorhabditae) was tested in the laboratory and the field in 1992 and 1993. Under laboratory conditions, applications of 5.0 × 105S. carpocapsae per square metre to larvae, pupae, and (or) adults resulted in 100% mortality in all experimental groups. Steinernema carpocapsae persisted through the larval–pupal and pupal–adult transitions. A single application of nematodes was sufficient to control the Colorado potato beetle. The following treatments were tested at field sites in New Brunswick and Prince Edward Island: (i) untreated check, (ii) application of nematodes, or (iii) application of insecticides. Straw mulch was either present or absent in each treatment. In 1992 in New Brunswick, nematodes and fenvalerate reduced Colorado potato beetle populations by 31% compared with the untreated check. However, in 1993, differences among treatments were not significant. The results from the field trials in Prince Edward Island were variable; the life expectancy of nematodes is likely shorter in the field than under laboratory conditions. Further investigation into the benefits of repeated applications of nematodes, higher rates, or improvements in application technology are required to achieve consistent control of the Colorado potato beetle.

Résumé

La sensibilité du Doryphore de la pomme de terre [Leptinotarsa decemlineata (Say), Coleoptera; Chrysomelidae] à des nématodes pathogènes (Steinernema carpocapsae, souche All, Nematoda : Heterorhabditae) a été testée en laboratoire et sur le terrain en 1992 et 1993. Dans des conditions de laboratoire, l’application de 5,0 × 105S. carpocapsae/m2 à des larves, des nymphes et (ou) des adultes de doryphores a entraîné 100% de mortalité chez tous les groupes expérimentaux. Les nématodes ont survécu aux transitions larve–nymphe et nymphe–adulte. Une application unique de nématodes a suffi à contrôler le Doryphore de la pomme de terre. Les traitements suivants ont été testés sur le terrain au Nouveau-Brunswick et à l’Île-du-Prince-édouard; (i) essai témoin sans application, (ii) application de nématodes, (iii) application d’insecticides, avec ou sans paillis. En 1992 au Nouveau-Brunswick, les nématodes et le fenvalérate ont réduit les populations de doryphores de 31% par rapport à la zone témoin. Cependant, en 1993, les différences entre les résultats des traitements n’ont pas été significatives. Les résultats des tests sur le terrain à l’Île-du-Prince-Édouard ont été variables; l’espérance de vie des nématodes est probablement plus courte en nature qu’en laboratoire. Des recherches plus poussées sur les bénéfices d’applications répétées ou de concentrations plus élevées de nématodes, ou de méthodes d’application plus sophistiquées, assureront le contrôle continu du Doryphore de la pomme de terre.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 4 , August 1998 , pp. 509 - 514
Copyright
Copyright © Entomological Society of Canada 1998

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