Abstract
Susceptibility of three Choristoneura species to the HD-1 and NRD-12 strains of Bacillus thuringiensis var. kurstaki Berliner was compared using the diet-incorporation method. Susceptibility of C. fumiferana (Clemens) and C. pinus Freeman did not differ significantly, whereas C. occidentalis Freeman was significantly more susceptible to preparations produced in our laboratory and commercial formulations. There was no significant difference between pathogenicity of HD-1 and NRD-12 for any of the budworm species. That C. occidentalis was more susceptible than C. fumiferana also was demonstrated in assays with treated foliage of balsam fir, Abies balsamea L., using spray deposits that are representative of ultra-low-volume applications.
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