The present investigation was carried out during kharif season 2010 and 2012 at farmers’ field near College of Agriculture, Kundeshwar Road, Tikamgarh (.). Nine insecticides were evaluated against semilooper and tobacco caterpillar on JS 93-05 variety of soybean in randomized complete block design with three replications. The result revealed that all the insecticides, under investigation, were found effective in reducing the population of semilooper and tobacco caterpillar over the unsprayed control. However, among the insecticides, indoxacarb ( SC) was superior followed by lembda cyhalothrin (5 EC) in reducing the larval population of semilooper and tobacco caterpillar. | Effectiveness of some insecticides against larval population of two major defoliators of soybean