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RESPONSES OF LARVAL CHORISTONEURA ROSACEANA (HARRIS) (LEPIDOPTERA: TORTRICIDAE) TO A FEEDING STIMULANT

Published online by Cambridge University Press:  31 May 2012

S.Y. Li  and
S.M. Fitzpatrick
S.Y. Li
Affiliation:
Canadian Forest Service, Pacific Forestry Centre, 506 West Bumside Road, Victoria, British Columbia, Canada V8Z 1M5
S.M. Fitzpatrick*
Affiliation:
Agriculture and Agri-Food Canada, Pacific Agri-Food Research Centre, 6947 No, 7 Hwy, PO Box 1000, Agassiz, British Columbia, Canada V0M 1A0
*
1Author to whom correspondence should be addressed.
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Abstract

The commercial feeding stimulant Pheast® was tested in the laboratory to determine its attractive and phagostimulatory effects on larval Choristoneura rosaceana (Harris). In choice experiments, larvae were attracted initially to filter paper discs treated with Pheast, but did not remain on or near treated discs. Larvae were not attracted initially to raspberry leaf discs treated with Pheast, but were more likely to stay near treated leaf discs than water-dipped ones. Larvae were neither attracted to nor arrested on whole raspberry leaves treated with Pheast. In no-choice experiments, larvae fed Pheast-treated leaves consumed more leaf tissue than, and grew almost twice as quickly as, larvae fed leaves dipped in water. When larvae were fed leaves treated with Dipel WP (Bacillus thuringiensis var. kurstaki) plus 5% Pheast, the mortality was 93% greater than that of larvae fed leaves treated with Dipel WP alone. These results suggest that Pheast has potential to enhance efficacy of B. thuringiensis against C. rosaceana on raspberries in the field.

Résumé

Les effets attirants et phagostimulateurs du stimulant alimentaire commercial Pheast® sur les larves de Choristoneura rosaceana (Harris) ont été étudiés en laboratoire. Dans des expériences de choix, les larves ont d’abord été attirées par des rondelles de papier filtre traitées au Pheast, mais ne sont pas restées sur les rondelles, ni même dans leur voisinage. Les larves n’étaient pas attirées au départ par des rondelles de feuilles de framboisier traitées au Pheast, mais avaient plus tendance à rester dans le voisinage de ces feuilles que dans le voisinage de rondelles de feuilles trempées dans l’eau. Les larves n’étaient pas attirées par des feuilles entières de framboisier traitées au Pheast et n’avaient pas tendance à rester dans leur voisinage. Dans des expériences où il n’y avait pas de choix, les larves nourries de feuilles traitées au Pheast ont consommé plus de tissu foliaire que les larves nourries de feuilles trempées dans l’eau et ont eu une croissance presque deux fois plus rapide. Chez des larves nourries de feuilles traitées au Dipel WP (Bacillus thuringiensis var. kurstaki) additionné de 5% de Pheast, la mortalité a été de 93% plus élevée que celle de larves nourries de feuilles traitées au Dipel WP seul. Ces résultats indiquent que l’addition de Pheast a de fortes chances d’augmenter l’efficacité de B. thuringiensis dans la lutte contre C. rosaceana dans les cultures de framboisiers.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 2 , April 1997 , pp. 363 - 369
Copyright
Copyright © Entomological Society of Canada 1997

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