Abstract

                                Effect of nine insecticides. studied on the incidence of Apis cerand indica Fab. in mustard ecosystem revealed significant difference among the treatments. Higher population of the bees was recorded in neem extract (0.2 and 0.035%) and cartap hydrochloride (0.04 and 0.08%). Malathion (0.025 and 0.05%), dimethoate (0.015 and 0.03%), Imidacloprid (0.025%), acephate (0.025%) and ethofenprox (0.002%) ranked in moderate group of toxicity registering moderate population of bees. Low population of bees was recorded in accphate (0.05%), imidacloprid (0.05%), ethofenprox (0.004%) and cypermethrin (0.001 and 0.002%).

Key words : Apis cerana indica, Insecticides, Field evalution.