title: Toxicity of Bacillus thuringiensis Spo Cr Mutants for the European Corn Borer Ostrinia nubilalis.
abstract: Inclusion bodies isolated from Spo Cr mutants of Bacillus thuringiensis were toxic for larvae of the European corn borer. Probit analysis revealed comparable toxicity between wild-type crystals (isolated from B. thuringiensis subsp. kurstaki) and crystals produced from two spore-free mutants of the same subspecies. Death of the larvae was due to starvation, presumably through delta-endotoxin-induced gut paralysis. Inclusion bodies pretreated with alpha-chymotrypsinogen were equally as toxic as native crystals for the insect larvae.
authors.affiliation: Northern Regional Research Center, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Peoria, Illinois 61604.
authors.forename: D E
authors.initials: DE
authors.lastname: Johnson
authors.forename: B
authors.initials: B
authors.lastname: Freedman