Watanalai PanbangredSomsak PantuwatanaAmaret BhumiratanaMahidol University2018-06-012018-06-011979-01-01Journal of Invertebrate Pathology. Vol.33, No.3 (1979), 340-34710960805002220112-s2.0-0018471174https://repository.li.mahidol.ac.th/handle/20.500.14594/13144Among six strains of Bacillus thuringiensis and five other species of Bacillus, only two strains of B. thuringiensis, strains HD-1 and BA-068, were toxic to Aedes aegypti larvae within 24 hr. The LC 50 s were 5.6 × 10 4 and 2.4 × 10 5 spores/ml for strains HD-1 and BA-068, respectively. The toxic factor(s) was heat sensitive and γ ray resistant and preliminary evidences indicated that it was associated with the crystalline body of B. thuringiensis. © 1979.Mahidol UniversityAgricultural and Biological SciencesArticleSCOPUS10.1016/0022-2011(79)90036-3