Determination of toxicity of newer insecticide molecules against pulse beetle, Callosobruchus maculatus (Fabricius) (chrysomelidae: Coleoptera) under laboratory conditions

Abstract

Present study was conducted to evaluate the insecticidal activity and mode of action of commercial formulations of newer insecticides viz., Spinosad 45 % SC, Chlorantraniliprole 18.5 % SC, Emamectin benzoate 5 % SG, Chlorfenapyr 10 % SC against pulse beetle, Callosobruchus maculatus (Fabricius) by dry film residue method under laboratory conditions during the year 2017-18 in the Department of Entomology, Banaras Hindu University. Results of study were compared with check treatment Deltamethrin 2.8 % SC. Among the tested insecticides Spinosad 45 % SC showed best efficacy at both LC50 and LC99.9 and it was more toxicity than other insecticides. The LC50 values of Spinosad 45 % SC to the adults of C. maculatus were 0.0005, 0.0003 and 0.0002 per cent while LC99.9 values were 0.0037, 0.0027 and 0.001 percent at 24, 48 and 72 hours after treatment (HAT), respectively. The log concentration probit (lcp) lines slope (b) values for Spinosad 45 % SC were 2.634, 2.513 and 3.455 at 24, 48 and 72 HAT, respectively. © 2020, Editorial board of Journal of Experimental Biology and Agricultural Sciences. All rights reserved.