Canadian Forest Service Publications
Three years of aerial field experiments with Bacillus thuringiensis plus chitinase formulation against the spruce budworm. 1974. Smirnoff, W.A. Journal of Invertebrate Pathology 24, 344-348.
Issued by: Laurentian Forestry Centre
Catalog ID: 35986
Availability: PDF (request by e-mail)
From 1971 to 1973 several Bacillus thuringiensis formulations were tested in the field against larvae of the spruce budworm under various conditions of population and tree defoliation. The results showed B. thuringiensis treatments can be a weapon in the control of spruce budworm outbreaks and the beneficial effect of B. thuringiensis treatments appear to be prolonged over 1 or 2 years. A new compact formulation was developed making B. thuringiensis treaments more economical and competitive with chemical insecticides.