Efficacy of insecticides and biorationals on soybean semilooper Gesonia gemma

Incidence of semilooper in soybean ranged from 8.79 to 10.60 larvae/mrl (m row length) and 6.30 to 11.52 larvae/mrl, a day before the first and second sprays, respectively. At 3 and 7 days after first and second sprays the least population of semilooper was achieved with rynaxypyr 20SC (2010–11 & 2011–12). At 14 days, the population became the least with rynaxypyr 20SC after first spray and with chlorpyriphos 20EC after second spray. Rynaxypyr 20SC was found to be the most effective followed by emamectin benzoate and chlorpyriphos.