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A strain of Bacillus causing disease in caterpillars of Arctornis submarginata, a defoliator of tea crop, was isolated from Darjeeling terai region. The strain showed positive reaction in lysine decarboxylase, ornithin decarboxylase, Voges-Proskaur, citrate utilization, nitrate reduction and in utilization of trehalose and glucose; difference with Btk was observed in ONPG test, and in utilization of citrate, arabinose, xylose, cellobios, melibiose and saccharose. The doubling time was 84 min, which is exactly the double of that of Btk. Difference was not evident in protein profile of the strain with that of Btk. The LC50 value was found to be 398.1 µg/ml with fiducial lower limit 353.06µg/ml and UL 443.14 µg/ml. The LC50 value of the new strain was lower than that of Btk, which was found to be [537.0 µg/ml; LL 483.63µg/ml and UL, 590.37µg/ml. The LT50 values of the new strain were also lower than that of Btk. These values were, 7.28 days for 1000 µg/ml and 8.88 days for 750 µg/ml as compared to the LT50 values 7.57 days for 1000 µg/ml and 9.5 days for 750 µg/ml of Btk. This findings opened up the possibility of developing new strain as microbial pesticide after standardizing its formulations and determining its safety aspects.
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