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EXPOSING LARVAE OF THE SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) TO SUBLETHAL DOSES OF BACILLUS THURINGIENSIS SUBSP. KURSTAKI DOES NOT AFFECT SURVIVAL DURING THE PUPAL STAGE

Published online by Cambridge University Press:  31 May 2012

Kees van Frankenhuyzen  and
John Dedes
Kees van Frankenhuyzen*
Affiliation:
Great Lakes Forestry Centre, Canadian Forest Service, Natural Resources Canada, P.O. Box 490, Sault Ste. Marie, Ontario, Canada P6A 5 M7
John Dedes
Affiliation:
Great Lakes Forestry Centre, Canadian Forest Service, Natural Resources Canada, P.O. Box 490, Sault Ste. Marie, Ontario, Canada P6A 5 M7
*
1 Author to whom all corresponding should be addressed (E-mail: kvanfran@nrcan.gc.ca).
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Extract

A process-oriented model was recently developed to simulate the efficacy of spray products containing Bacillus thuringiensis Berliner subsp. kurstaki (Bacillaceae) against the spruce budworm, Choristoneura fumiferana Clemens (Cooke and Régnière 1996). The model accurately predicted foliage protection and larval population reduction during validation spray trials (Régnière and Cooke 1998; Cooke and Régnière 1999). The impact of treatment on budworm generation survival was generally well mimicked by the model except for a consistent overestimation of survival at the end of immature development in the treated plots. Régnière and Cooke (1998) speculated that residual mortality due to treatment may be occurring during the pupal stage. Carry-over of B. thuringiensis from larvae to pupae has been documented for spruce budworm (Klein and Lewis 1966) and several other Lepidoptera (Legner and Oatman 1962; Angus 1965). Although we recently investigated the response of spruce budworm larvae to ingestion of sublethal doses of B. thuringiensis (Pedersen et al. 1997), effects on pupal survival or adult emergence were not examined. In this note, we report the results of an experiment designed to assess such effects.

Type
Articles
Information
The Canadian Entomologist , Volume 132 , Issue 3 , June 2000 , pp. 341 - 343
Copyright
Copyright © Entomological Society of Canada 2000

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