1Division of Entomology, I.A.R.I., New Delhi – 110 012, India
2Division of Microbiology, I.A.R.I., New Delhi – 110 012, India
Department of Biology, Jazan University, Jizan - 114, Saudi Arabia
*Email: mdaslam30@gmail.com
Online published on 27 December, 2012.
Bacillus thuringiensis kurstaki strain HD-73 proved most effective by registering lowest LC50 value (0.09505) against Spilarctia obliqua larvae. However, Btk strain Path-1 was least effective. Taking LC50 values of dipel as unity, Btk HD-73, Bt sotto, Bt aizawai, Bt N1C1, Btk HD-1 and Bt thuringiensis were 1.18505, 1.16970, 1.16336, 1.13555, 1.08552 and 1.06925 times more effective than dipel, respectively, whereas, Bt entomocidus, Bt galleriae and Btk Path-1 were found to be 0.95548, 0.92464 and 0.90417 times less effective than Dipel. Btk HD-73 also persisted for 168 hrs after treatment, under field conditions.
Bioassay, Bacillus thuringiensis, Spilarctia obliqua
