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Appl Environ Microbiol. 1978 January; 35(1): 121-123

Toxicity of Bacillus thuringiensis spores to the tobacco hornworm, Manduca sexta.

J H Schesser and L A Bulla Jr

ABSTRACT

Toxicity of Bacillus thuringiensis spores to the tobacco hornworm, Manduca sexta, is described. The numbers of larvae killed were in relation to spore dry weight. At a surface application of 6.8 ng/cm2, there was an 85 percent survival, but less than 50 percent survived at 68.2 ng/cm2. Striking similarity of spores to parasporal crystals is revealed by slope of mortality curves, inhibition of stadial growth, and 50 percent lethal dose values based on protein content.

Appl Environ Microbiol. 1978 January; 35(1): 121-123




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