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A COMPARISON OF THREE METHODS OF MONITORING THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (LECONTE) (COLEOPTERA: CURCULIONIDAE)

Published online by Cambridge University Press:  31 May 2012

A.B. Stevenson  and
E.S. Barszcz
A.B. Stevenson
Affiliation:
Agriculture and Agri-Food Canada, Pest Management Research Centre, PO Box 6000, 4902 Victoria Avenue North, Vineland Station, Ontario, Canada L0R 2E0
E.S. Barszcz
Affiliation:
Agriculture and Agri-Food Canada, Pest Management Research Centre, PO Box 6000, 4902 Victoria Avenue North, Vineland Station, Ontario, Canada L0R 2E0
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Abstract

The carrot weevil, Listronotus oregonensis (LeConte), was monitored at 11 research or commercial carrot plantings at Holland Marsh, Kettleby, Ontario, using three methods, i.e. wooden plate (Boivin) traps to capture adults, carrot root sections placed in the soil to detect oviposition, and recording the numbers of adults present on carrot root sections. All three methods provided similar records of the seasonal pattern of adult activity. At most sites, thresholds used to determine the need for insecticide applications were reached or exceeded soon after the beginning of monitoring.

There were significant linear relationships among the seasonal activity parameters generated by the three methods and between those parameters and percentage injury at harvest. Control programs that would have resulted from the use of each method are discussed.

Résumé

Le Charançon de la carotte, Listronotus oregonensis (LeConte), a été étudié dans 11 plantations commerciales ou expérientales de carottes à Holland Marsh, Kettleby, Ontario, par trois méthodes : utilisation de pièges formés de plaques de bois (Boivin) pour capturer les adultes, enfouissement de tranches de racines de carottes dans le sol pour enregistrer la ponte, dénombrement des adultes présents sur les tranches de racines de carottes. Les trois méthodes ont mené aux mêmes conclusions sur l’activité saisonnière des adultes. À la plupart des endroits, les seuils déterminant la nécessité d’utiliser des insecticides ont été atteints ou dépassés peu après le début du suivi.

Nous avons trouvé des relations linéaires significatives entre les paramètres de l’activité saisonnière générés par les trois méthodes et entre ces paramètres et le pourcentage des dommages causés aux récoltes. Les programmes de lutte qui auraient résulté de chacune de ces méthodes considérée séparément sont examinés.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 1 , February 1997 , pp. 187 - 194
Copyright
Copyright © Entomological Society of Canada 1997

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