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APPLICATION OF THE CABBAGE LOOPER EQUIVALENT MODEL TO LEPIDOPTEROUS PESTS OF BRUSSELS SPROUTS IN PRINCE EDWARD ISLAND

Published online by Cambridge University Press:  31 May 2012

Andrew P. Dornan ,
Jeff G. Stewart  and
Mark K. Sears
Andrew P. Dornan
Affiliation:
Agriculture Canada Research Station, Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8
Jeff G. Stewart
Affiliation:
Agriculture Canada Research Station, Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8
Mark K. Sears
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

An investigation into the use of thresholds based on Cabbage Looper Equivalents (CLE) was conducted on Brussels sprouts, Brassica oleracea var. gemmifera (L.), cv. Valiant, grown in Prince Edward Island in 1991 and 1992. The CLE model was used to equate foliage consumption by larvae of the imported cabbageworm, Pieris rapae (L.), the diamondback moth, Plutella xylostella (L.), and the cabbage looper, Trichoplusia ni (Hübner). Management strategies included the following: (1) an untreated check; applications of insecticides after thresholds of (2) 1.0 CLE; (3) 0.50 CLE; or (4) 0.25 CLE per plant were exceeded; (5) bi-weekly applications of insecticides; and (6) applications of insecticides according to the grower’s spray schedule.In 1991, the imported cabbageworm was the most abundant species in the complex attacking the crop and high yields were obtained in all treatments. However, in 1992, the diamondback moth was the principal species and significantly reduced marketable yields in all treatments. Use of CLE as a model for threshold determination in the crop of Brussels sprouts underestimated the potential of the diamondback moth for damage and resulted in improper timing of applications of insecticide for adequate control of the diamondback moth.

Résumé

L’utilisation des seuils établis selon le modèle des équivalents de la Fausse-arpenteuse du chou (modèle CLE) a été testée sur des choux de Bruxelles, Brassica oleracea var. gemmifera (L.) cv. Valiant, cultivés dans l’Île du Prince-Édouard en 1991 et 1992. Le modèle CLE a été utilisé pour évaluer la consommation de feuillage par des larves de Piérides du chou, Pieris rapae (L.), de Fausses-teignes des crucifères, Plutella xylostella (L.), et de Fausses-arpenteuses du chou, Trichoplusia ni (Hübner). Différentes stratégies d’aménagement ont été utilisées : (1) une grille échantillon témoin non traitée; des arrosages d’insecticides après que les seuils de (2) 1,0 CLE, (3) 0,50 CLE, (4) 0,25 CLE par plant aient été dépassés; (5) des arrosages bi-hebdomadaires d’insecticides et (6) des arrosages d’insecticides selon le programme établi par le cultivateur.En 1991, les Piérides du chou représentaient l’espèce la plus abondante parmi les parasites de la culture et tous les traitements ont permis d’obtenir des récoltes abondantes. Cepandant, en 1992, la Fausse-teigne des crucifères était la principale espèce et sa présence a diminué significativement les récoltes utilisables commercialement, quel qu’ait été le traitement utilisé. L’utilisation du modèle CLE pour la détermination des seuils dans le cas du chou de Bruxelles sous-estime les dommages que peut causer la Fausse-teigne des crucifères et résulte en une détermination erronée du moment idéal de l’application d’insecticide pour en assurer le contrôle.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 4 , August 1994 , pp. 961 - 969
Copyright
Copyright © Entomological Society of Canada 1994

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