Canadian Forest Service Publications
Can Bacillus thuringiensis replace chemical insecticides in the control of spruce budworm. 1976. Blais, J.R. Forestry Chronicle 52(2): 57-60.
Available from: Laurentian Forestry Centre
Catalog ID: 14950
Recent demands by citizen groups calling for replacement of chemical insecticides by Bacillus thuringiensis (B.t.) a microbial insecticide, for the control of spruce budworm have received considerable publicity. Effects of chemical spray operations on the forest environment are discussed, and progress made to date with trial applications of B.t. against spruce budworm is reported. Although great caution should be exercised in the aerial application of insecticides, there is no evidence that these chemical compounds at conventional dosages cause serious damage to the forest environment. Although a desirable substitute for chemicals, B.t. still presents many drawbacks and requires further experimentation before it can be recommanded as an economic alternative for effective reduction of damage by spruce budworm.
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