Kanhaiya Lal Thanna, N.S. Bhadauria, Chetan M. Bondre, Pooja Chauhan and Pradyumn Singh
Abstract
Studies on reaction of ten varieties of soybean against Bihar hairy caterpillar, Spilosoma obliqua (Walk.) were conducted Department of Entomology, College of Agriculture, Gwalior during 2014-15. The parameters taken for the studies were consumability of the leaves, weight of larvae, larval period, larval length, consumption index (C.I.) growth rate (G.R.) efficiency of conversion of ingested food (E.C.I.) and approximate digestibility (A.D.). On the basis of weight of leaves consumed by the larvae and consumption index (C.I.), the variety NRC-94 was found least preferred for feeding followed by JS-20-71 and JS-20-69. Variety NRC- 94 showed non preference mechanism for feeding against the bihar hairy caterpillar. On the basis of weight gained by larvae, larval length, growth rate (G.R.) E.C.I., A.D., larval period, variety JS-20-71 showed, growth retardant effect against bihar hairy caterpillar. Variety JS-20-71 showed antibiosis mechanism of resistance against the pest. Variety JS-20-71 was found less susceptible to the pest followed by NRC-94. Whereas, variety RVS-2001-18 and JS-335 were found more susceptible to the pest.