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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

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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

References

Abbott, W.S. 1925. A method of computing effectiveness of an insecticide. Journal of Economic Entomology 18: 265–267.Google Scholar
Bishop, Y.M.M., Feinberg, S.E., and Holland, P.W.. 1975. Discrete Multivariate Analysis: Theory and Practice. MIT Press, Cambridge, MA. x + 557 pp.Google Scholar
Cadogan, B.L. 1987. Experimental aerial application of Matacil flowable insecticide to control spruce budworm (Lepidoptera: Tortricidae). Crop Protection 6: 130–135.CrossRefGoogle Scholar
Dixon, W.J. 1983. BMDP Statistical Software. University of California Press, Berkeley, CA. 733 pp.Google Scholar
Fast, P.G., and Régnière, J.. 1984. Effect of exposure time to Bacillus thuringiensis on mortality and recovery of the spruce budworm (Lepidoptera: Tortricidae). The Canadian Entomologist 116: 123–130.Google Scholar
Fettes, J.J. 1950. Investigations of sampling techniques for population studies of the spruce budworm on balsam fir in Ontario. Forest Insect Laboratory Sault Ste. Marie Annual Technical Report 4: 163–401.Google Scholar
Hamel, D.R. 1977. The effects of Bacillus thuringiensis on parasitoids of the western spruce budworm, Choristoneura occidentalis (Lepidoptera: Tortricidae), and the spruce coneworm, Diorytria reniculelloides (Lepidoptera: Pyralidae), in Montana. The Canadian Entomologist 109: 1409–1415.Google Scholar
Hardy, Y., Auger, M., and Caron, M.. 1977. Étude du développement de la tordeuse des bourgeons de l'épinette. Bulletin technologie No. 2, Ministère des Terres et Fôrets. 4 pp.Google Scholar
McMorran, A. 1965. A synthetic diet for the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). The Canadian Entomologist 97: 58–62.Google Scholar
Miller, C.A. 1963. Parasites and the spruce budworm. Memoirs of the Entomological Society of Canada 31: 228–244.CrossRefGoogle Scholar
Nealis, V.G. 1988. Weather and the ecology of Apanteles fumiferanae Vier. (Hymenoptera: Braconidae). Memoirs of the Entomological Society of Canada 146: 57–70.Google Scholar
Nealis, V.G. 1991. Parasitism in sustained and collapsing populations of the jack pine budworm Choristoneura pinus pinus Free. (Lepidoptera: Tortricidae), in Ontario, 1985–1987. The Canadian Entomologist 123: 1065–1075.CrossRefGoogle Scholar
Nealis, V.G., and Lysyk, T.J.. 1988. Sampling overwintering jack pine budworm, Choristoneura pinus pinus Free. (Lepidoptera: Tortricidae), and two of its parasitoids (Hymenoptera). The Canadian Entomologist 120: 1101–1111.Google Scholar
Nealis, V., and Régnière, J.. 1987. The influence of parasitism by Apanteles fumiferanae Vier. (Hymenoptera: Braconidae) on spring dispersal and changes in the distribution of larvae of the spruce budworm (Lepidoptera: Tortricidae). The Canadian Entomologist 119: 141–146.Google Scholar
Nealis, V., and van Frankenhuyzen, K.. 1990. Interactions between Bacillus thuringiensis Berliner and Apanteles fumiferanae Vier. (Hymenoptera: Braconidae), a parasitoid of the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). The Canadian Entomologist 122: 585–594.Google Scholar
Niwa, C.G., Stelzer, M.J., and Beckwith, R.C.. 1987. Effects of Bacillus thuringiensis on parasites of western spruce budworm (Lepidoptera: Tortricidae). Journal of Economic Entomology 80: 750–753.Google Scholar
van Frankenhuyzen, K., and Nystrom, C.. 1987. Effect of temperature on mortality and recovery of spruce budworm (Lepidoptera: Tortricidae) exposed to Bacillus thuringiensis Berliner. The Canadian Entomologist 119: 941–954.Google Scholar
Wilkinson, L. 1990. SYSTAT: The System for Statistics. SYSTAT, Inc., Evanston, IL. xviii + 675 pp.Google Scholar