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分别在2005年和2006年的5、6月份,在Kamalpur和Hunterpara茶园、孟加拉西部以及印度地区对一种昆虫致病真菌球孢白僵菌对油桐尺蛾Buzura(=Biston)suppressaria Guen.的生物效力进行了评估。以农场主常用的化学杀虫剂40%SP灭多虫和25%EC氯氰菊酯作为标准检测物。试验中球孢白僵菌浓度为1.50 g,2.00 g和2.5 g/lit.of water;灭多虫和氯氰菊酯浓度分别为0.75 mL,1.00 mL和1.50 mL,和0.50 mL,1.00 mL和1.50 mL/lit.of water。在喷洒2.5 g/lit.of water球孢白僵菌3天后,Kamalpur和Hunterpara茶园中油桐尺蛾种群个体数分别降低了88.00%和84.00%。死的毛虫变成黑色,垂悬在叶片上。并且发现球孢白僵菌的杀虫活性与高剂量的灭多虫和氯氰菊酯的相当。
An insecticidal fungus Beauveria bassiana against Buzura (= Biston) suppressaria Guen., An insect-causing fungus, was isolated in June and June 2005 in Kamalpur and Hunterpara tea farms, western Bangladesh and India respectively. Biological effectiveness was assessed. 40% SP insecticides and 25% EC cypermethrin, which are commonly used by farm owners, were used as the standard test items. Beauveria bassiana concentrations of 1.50 g, 2.00 g and 2.5 g / lit.of water were tested in the experiment; the concentrations of pest and cypermethrin were 0.75 mL, 1.00 mL and 1.50 mL, and 0.50 mL, 1.00 mL and 1.50 mL / lit.of water. After spraying 2.5 g / lit.of water Beauveria bassiana for three days, the individual numbers of T. tatarida population in Kamalpur and Hunterpara tea gardens decreased by 88.00% and 84.00%, respectively. The dead caterpillar turns black and hangs on the leaves. It was found that Beauveria bassiana insecticidal activity and high doses of insecticide and cypermethrin equivalent.