Efficacy of Bacillus thuringiensis var. kurstaki against sorghum stem borer, Chilo parellus (Swinhoe)

The experiment was conducted to test efficacy of Bacillus thuringiensis products in comparison with recommended conventional insecticide against sorghum stem borer, Chilo parellus (Swinhoe) at Sorghum Research Unit, Dr. P. D. K. V., Akola. The result revealed significant superiority of Bacillus thuringiensis and endosulfan treatments at one to three sprays than untreated control in case of leaf injury. In case of peduncle damage, application of two sprays of Bacillus thuringiensis (@ 1 kg/ha) on 25^th and 35^th day was on par with three sprays of both endosufan and Bacillus thuringiensis. Similarly on the basis of grain yield, three sprays of Bt recorded maximum grain yield and it was significantly higher than untreated control and also the treatment viz. one spray of Bacillus thuringiensis or endosulfan.,