Selective Medium for Mosquito-Pathogenic Strains of <i>Bacillus sphaericus</i>

A selective medium (BATS), which contains arginine as the sole carbon and nitrogen source and which also contains streptomycin, allowed growth of 18 mosquito-pathogenic strains of Bacillus sphaericus . It inhibited the growth of 68% of the nonpathogenic B. sphaericus strains tested as well as other Bacillus spp. and aquatic bacteria.