Infection mechanism of the disease of the silkworm, Bombyx mori L., caused by Bacillus thuringiensis var. thuringiensis Berliner : Ⅰ. Separation of the spores of B. thuringiensis
Infection mechanism of the disease of the silkworm, Bombyx mori L., caused by Bacillus thuringiensis var. thuringiensis Berliner : Ⅱ. Multiplication mode of the intestinal spores and toxicity of B. thurinrgiensis in the silkworm