Bioassay of Bacillus thuringiensis parasporal crystal and its toxic components using the maize borer, Chilo partellus (Swinhoe)

C D RAO, Y I SHETHNA

Abstract


A method for determining the toxicity of B. thuringiensis parasporal crystal and its toxic components to the maize borer, Chilo partellus, is described. Chilo partellus is highly sensitive to the O'-endotoxin and provides a highly sensitive and reproQucible bioassay that can be used' to compare relative toxicities of crystals from others subspecies as well as the toxic components of the crystals.

Keywords


Bacillus thuringiensis; Chilo partellus; parasporai crystal; o-endotoxin; insecticide; bioassay; artificial diet; probit-mortality; LC50 toxic component.

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