Tests of Bacillus thuringiensis var. thuringiensis Berliner and B. cereus Frankland and Frankland on Larvae of Choristoneura fumiferana (Clemens)

Abstract

The susceptibility of the spruce budworm, Choristoneura fmiferana (Clemens), under laboratory conditions, to commercial preparations of Bacillus thuringiensis var. thuringiensis Berliner was reported by Angus et al. in 1961. This bacterium was recently tested, under field conditions, both as dusts and sprays. The results of ehese tests are presented here with comments on the effect of the environment and other factors.