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CONSERVATION OF SPRUCE BUDWORM PARASITOIDS FOLLOWING APPLICATION OF BACILLUS THURINGIENSIS VAR. KURSTAKI BERLINER

Published online by Cambridge University Press:  31 May 2012

V.G. Nealis ,
K. van Frankenhuyzen  and
B.L. Cadogan
V.G. Nealis
Affiliation:
Forestry Canada, Ontario Region, PO Box 490, Sault Ste. Marie, Ontario, Canada P6A 5M7
K. van Frankenhuyzen
Affiliation:
Forest Pest Management Institute, PO Box 490, Sault Ste. Marie, Ontario, Canada P6A 5M7
B.L. Cadogan
Affiliation:
Forest Pest Management Institute, PO Box 490, Sault Ste. Marie, Ontario, Canada P6A 5M7
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Abstract

Field trials in northern Ontario in 1990 and 1991 confirmed that survival of spruce budworm larvae [Choristoneurafumiferana (Clemens)] (Lepidoptera: Tortricidae) parasitized by Apanteles fumiferanae Viereck (Hymenoptera: Braconidae) was greater than survival of nonparasitized budworm larvae following application of Bacillus thuringiensis var. kurstaki Berliner (Bt). Apparent parasitism by A. fumiferanae increased slightly when application of Bt was early (instar III or IV) but increased significantly when applications were later in the season (instars IV–VI). Delaying the timing of the spray conserved parasitoids while providing significant reductions in budworm densities and not compromising the primary objective of Bt application, i.e. the protection of current year foliage. The potential for long-term management of spruce budworm through the strategic integration of natural and imposed mortalities is discussed.

Résumé

Des expériences sur le terrain dans le nord de l’Ontario, en 1990 et 1991, ont confirmé que la survie des larves de la Tordeuse des bourgeons de l’épinette [Choristoneura fumiferanae (Clemens)] (Lepidoptera : Tortricidae) parasitées par Apanteles fumiferanae Viereck (Hymenoptera : Braconidae) est supérieure à la survie des larves non parasitées à la suite d’un traitement au Bacillus thuringiensis var. kurstaki (Berliner) (Bt). Le parasitisme des larves par l’hyménoptère semble augmenter légèrement lorsque l’application de Bt est hâtive (stade m ou IV), mais augmente significativement lorsque les applications sont faites plus tard dans la saison (stades IV–VI). En différant le moment de la vaporisation, il est possible de conserver les parasitoïdes tout en réduisant significativement la densité des tordeuses, donc sans compromettre l’objectif premier de l’application du bacille, soit la protection du feuillage de l’année en cours. La possibilité d’un contrôle à long terme de la Tordeuse des bourgeons de l’épinette par intégration stratégique des mortalités naturelles et imposées fait l’objet d’une discussion.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 6 , December 1992 , pp. 1085 - 1092
Copyright
Copyright © Entomological Society of Canada 1992

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