FIELD: microbiological industry. SUBSTANCE: strain of bacterium Bacillus sphaericus is isolated from the natural sources and deposited in All-Union collection of microorganisms at N B-6408. Preparation against mosquitos is obtained by the strain culturing on yeast-polysaccharide medium for 48 h at 30 C. Mosquicide activity of the strain tested on mosquito larvae Culex pipiens is: $$$ = 0.005; $$$ = 0.01 mg/l. EFFECT: enhanced effectiveness of strain indicated above. 2 tbl
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