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We cxamined the growth characteristics and competitive abilities of Baa'llus thuri}4gieizsis and BaaiUus cetetts in soi]. The growth and pcrsistence of the two bacilli, added to sterile soil with or without soil bactcria, were monitored under aerobic conditiens. When vegetativc cells or sporcs of B. thun'ngi'ensis andlor B. cerezar were addecl to steriie soil, both bacilli increased their nurnbers. The final Iovels ofpopulation were greater for B. cetetts than for B. thuritrgz'ensis. In most of the cases when vegetative cells of B. thuri}agiensis were added at the same time as indigenous oil bacteria to steriIe soil, B, thun'ngdensis porulated immediatcly without any growth. B. thuringt'ensas' grew only when both B, thun'ngieizsds and indigenous soil bacteria wcre inoculated at low densities. On the othcr hand, when vegetativc cclls or speres of B. ccreus wcre added at the same time as indigenous soil bacteria to sterile soil, B. cereus grcw even whcn indigenous seil bacteria were inoculated at high density. These data suggest that B. thuri}eimsis i less adaptive to soil habitats than B. cereus. IZigr wonts: Bacitlus thapm, Bact'iitts ceretts, competition, soil, interaction, endotoxin

Comparative Studies of Growth Characteristic and Competitive Ability in Bacillus thuringiensis and Bacillus cereus in Soil