Comparative toxicity of some insecticides against army worm, Spodoptera litura L. (Lepidoptera: Noctuidae) under laboratory conditions

Abstract

Cotton (Gossypium hirsutum L.) is one of the most impotent cash crops of Pakistan. It is well known fact that it is backbone of Pakistan’s economy. Spodoptera litura is one of the major insect of cotton that has the potential to reduce yields by 20-80%. Study was designed to check the efficacy of eight insecticides viz. Belt (flubendiamide 48SC), Ardent (acrinathrin 5EC), Match (leusenoran 5EC), Larvin (thiodicarb 80DF), Proaxis (Gamma-cyhalothrin 60CS), XDE (spinethylin 12SC), Lorsban (chloropyriphos 40EC) and Timer (emamectin 1.9EC) on fifth instar Spodoptera litura larvae. Results indicated that after 3 hours interval Match (lufenuron 5%EC) proved the most effective insecticide against armyworm followed by Lorsban (chloropyrifos 40EC), XDE (spinethylin 12% SC) Ardent (acrinathrin 5%EC), Proaxis (gamma cyhalothrin 40% EC), Timer (emamectin benzoate 1.9%EC), Larvin (thiodicarb 80%DF) and Belt (flubendiamide 48% SC) with LC50 values 226.08, 235.7 (140.0-395.46), 240.4 (296.7-194.8), 266.6 (324.3-219.2), 414.3 (529.7-324.6), 432.6 (516.7-332.1), 500.9 (777.8-434.1) and 588.7 (980.7-353.4) ppm, respectively.