The beta-exotoxin of an experimental preparation of Bacillus thuringiensis var. thuringiensis was bioassayed against neonate Colorado potato beetle larvae and its lethal concentrations determined. The amount of active ingredient in the preparation was determined by liquid chromatography. The Escherichia coli DNA Repair Assay was used to determine the DNA damaging potential of the beta-exotoxin, which was found to be negative in this system.
Contributor Notes
1 Mention of a commercial or proprietary product in this paper does not constitute an endorsement of the product by the U. S. Department of Agriculture.
2 The study director for the DNA repair assay was S. Louie of the testing facility Intox Laboratories, Redfield, AR 72132.
3 Vegetable Lab., Horticulture Science Inst.
4 Analytical Chemistry Lab., Agric. Environ. Quality Inst.