Vol. 11, Issue 7 (2022)

Author(s):
P Chaithanya, T Madhumathi, CH Chiranjeevi, S Krishnam Raju, KN Sreenivasulu and T Srinivas

Abstract:
A study was conducted to evaluate the toxicity of novel insecticides viz., spinosad 45 SC, spinetoram 11.7 SC, emamectin benzoate 5 SG, chlorfenapyr 10 SC, permethrin 25 EC and azadirachtin 10000 ppm against pulse beetle, Callosobruchus maculatus (Fab.) by jute cloth disc impregnation method under laboratory conditions during the year 2020-21 in the Department of Entomology, Agricultural College, Bapatla. Results of the study were compared with check treatments malathion 50 EC and deltamethrin 2.8 EC. Among tested insecticides the lowest values of LC₅₀, LC₇₅ and LC₉₀ were recorded for emamectin benzoate (0.00006, 0.0002 and 0.0006%) and chlorfenapyr (0.00006, 0.0002 and 0.0008%). Emamectin benzoate and chlorfenapyr recorded highest relative toxicity of 233.33 and 191.00 times than malathion and 41.67 and 83.00 times than deltamethrin at LC₅₀ and LC₇₅ whereas at LC₉₀, emamectin benzoate and chlorfenapyr were 156.50, 117.38 times toxic than malathion and 151.50, 113.63 times toxic than deltamethrin, respectively.