Persistent toxicity of certain newer insecticides on mulberry, rajmah bean and mung bean plants against Spodoptera litura (Fabricius)

The persistent toxicity of four insecticides on rajmah bean and mulberry plants was evaluated against 5d old larvae (mean larval wt.= 0.0028 g) of S. litura during 22^nd March-7^th April of the year 2016. Chlorantraniliprole + lambda-cyhalothrin @ 0.027% was found to be most persistent (PT value = 1841.60 and 2119.98) followed by cypermethrin + indoxacarb @ 0.02% (PT value = 812.68 and 1764.26) on mulberry and rajmah bean plants, respectively. Emamectin benzoate @ 0.0019% (PT value = 4.16) showed least persistence of toxicity on mulberry plant while beta-cyfluthrin + imidacloprid @ 0.012% (PT value = 140.00) on rajmah bean plant. In another experiment, persistent toxicity of some insecticide on rajmah bean and mung bean plants was examined against 6d old larvae (mean larval wt. = 0.018 g) of S. litura during 19^th April-15^th May, 2016. Chlorantraniliprole @ 0.0055% showed highest persistence (PT value = 916.52, 1072.50) and residual toxicity on rajmah (11 DAS) and mung bean (15 DAS) plants, respectively.