FIELD: microbiological industry. SUBSTANCE: strain of bacterium Bacillus thuringiensis var. kurstaki 7A is obtained by chemical mutagenesis using ethylmethanesulfonate and deposited in All-Russian Collection of Industrial Microorganisms at number B-5155. For bioinsecticide preparing strain is grown on the medium containing food yeast, corn flour and tap water. Activity of cultural fluid with respect to gypsy moth larvae is 0.044%. EFFECT: preparing of bacterial strain indicated above. 3 tbl
