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COMPARISON OF PLASTIC-LINED TRENCHES AND EXTRUDED PLASTIC TRAPS FOR CONTROLLING LEPTINOTARSA DECEMLINEATA (COLEOPTERA: CHRYSOMELIDAE)

Published online by Cambridge University Press:  31 May 2012

G. Boiteau  and
W.P.L. Osborn
G. Boiteau
Affiliation:
Potato Research Centre, Agriculture and Agri-Food Canada, P.O. Box 20280, 850 Lincoln Road, Fredericton, New Brunswick, Canada E3B 427
W.P.L. Osborn
Affiliation:
Potato Research Centre, Agriculture and Agri-Food Canada, P.O. Box 20280, 850 Lincoln Road, Fredericton, New Brunswick, Canada E3B 427
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Abstract

The efficacy of an extruded plastic trap placed on the ground was measured against plastic-lined trenches used to prevent the colonization of potato fields by walking overwintered Leptinotarsa decemlineata (Say). Laboratory comparisons showed that the original standard extruded trap did not capture as many adult beetles as the plastic-lined trench but that this could be corrected by abrading its surface. Beetles took longer to be trapped by the extruded trap than by the trench and walked away more frequently. The efficacy of the two barriers was unaffected by light simulated rain. Field tests in 1996 and 1997 confirmed that plastic-lined trenches can reduce adult abundance and egg deposition within field even when beetle populations were low. The original extruded trap did not significantly reduce egg deposition. However, it is suggested that a modified extruded trap could be used together with the plastic-lined trench to provide temporary closure of untrenched field sections used for farm equipment access or to surround small fields.

Résumé

L’efficacité d’un piège de plastique placé à la surface du sol a été comparée à celle d’une tranchée recouverte de plastique utilisée pour le controle des adultes de Leptinotarsa decemlineata (Say) lorsqu’ils colonisent des champs de pomme de terre en marchant. Les comparaisons en laboratoire démontrèrent que le piège de plastique original ne capturait pas autant d’adultes que les tranchées recouvertes de plastique mais que son efficacité pouvait être améliorée si sa surface était sablée. La capture des adultes se fit plus rapidement avec la tranchée recouverte de plastique qu’avec le piège de plastique. Les doryphores ont rebroussé chemin plus souvent en abordant le piège de plastique que la tranchée recouverte de plastique. Le taux de capture dans les deux pièges demeura inchangé suite à l’application d’une pluie légère simulée. Des essais en champs effectués en 1996 et en 1997 confirmèrent qu’une tranchée recouverte de plastique peut réduire l’abondance des adultes et la ponte en parcelles de pomme de terre même lorsque la densité du doryphore est basse. Le piège de plastique utilisé lors de ces essais n’a pas réussi à réduire la ponte de façon significative. Cependant, un piège de plastique modifié pourrait être utilisé avec la tranchée recouverte de plastique pour fermer temporairement les sections permettant l’accès au champ pour la machinerie de ferme ou pour entourer les petits champs.

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 4 , August 1999 , pp. 567 - 572
Copyright
Copyright © Entomological Society of Canada 1999

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