S. HASTOWO, B.W. LAY AND M. OHBA. 1992. A total of 135 strains of Bacillus thuringiensis were isolated from soils of sericultural and natural environments of various regions in Indonesia: Sumatra, Java, Bali, Timor, Sulawesi and Kalimantan. Serologically, 63 strains were assigned to flagella (H) serotypes 3abc, 3ade, 4ac, 5ac, 6ab, 8ab, 9, 11, 17, 20ac, and 24, indicating a varied flora of B. thuringiensis in Indonesia. Of these, the serotype 3ade predominated, followed by the serotypes 3abc and 6ab. The other 72 strains (53·3%) were not sero‐reactive against any of the H antisera to B. thuringiensis H serotypes 1–24. In toxicity tests, 34 strains belonging to serotypes 3abc, 3ade, 4ac, and 8ab showed larvicidal activity to the silkworm, Bombyx mori, while 74·8% did not exhibit insecticidal activity against larvae of B. mori and the mosquitoes, Aedes aegypti and Culex quinquefasciatus. Morphotypes of parasporal inclusions were not correlated with insecticidal activities.
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