Residual toxicity of newer insecticide molecules in treated stored maize against lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae)

Abstract

A storage experiment was conducted to study the residual toxicity of newer insecticide molecules on R. dominica in stored maize under ambient storage condition. The observations were recorded on adult mortality and presence of dead adults of test insect at tri-monthly interval up to nine months of storage period. Among the insecticides evaluated the spinosad 45 SC @ 2ppm and emamectin benzoate 5 SG @ 2ppm treatments were recorded with higher adult mortality in residual toxicity experiment and the least number of dead adult under natural infestation over different periods of storage. From the present investigations revealed that spinosad 45 SC @ 2 ppm and emamectin benzoate 5 SG @ 2 ppm were found to be most effective up to nine months after treatment imposition in combating the R. dominica in stored maize.