Efficacy of different insecticides against fall armyworm Spodoptera frugiperda (J.E. Smith) on maize (Zea mays L.)
Author(s): Sachin and Usha Yadav
Abstract: The present investigation was carried out at Central Research Farm (CRF), Department of Entomology, Sam Higginbottom University of Agriculture, Technology and Sciences. Prayagraj, Uttar Pradesh during Rabi season 2023-24. The experiment was laid in Randomized Block Design with eight treatments replicated thrice along with untreated control plot. Eight treatments are Imidacloprid 40% + Fipronil 40% (80 WG) @ 0.20 ml/Lit, Chlorantraniliprole 18.5% SC @ 0.20 ml/Lit, Spinetoram 11.7% SC @ 0.30 ml/Lit, Flubendiamide 39.35% SC @ 0.24 ml/Lit, Novaluron 10% EC @ 1 ml/Lit, Beauveria bassiana 5% @ 4 ml/Lit., NSKE 5% @ 50 g/lit were evaluated against fall armyworm (Spodoptera frugiperda). Study revealed that all the treatments was found significantly superior over control. The result showed that the treatments lowest mean larval population was recorded in T3 Spinetoram (1.28), followed by T1 Imidacloprid 40% + Fipronil 40% (1.58), T5 Novaluron (1.85), T4 Flubendiamide (2.09), T2 Chlorantraniliprole (2.28), T7 NSKE (2.48) and T6 Beauveria bassiana (2.67). The treatments T6 Beauveria bassiana (2.67) was least effective among all the treatments against Spodoptera frugiperda. The crop yield ranged between 44.40 q/ha to 19.24 q/ha in the treatments and benefit cost ratio ranged between 1:2.20 to 1:1.08. The plot treated with Spinetoram 11.7% SC showed highest yield and benefit cost ratio (44.40 q/ha, 1:2.20) and found to be most effective treatment next to which, Imidacloprid 40% + Fipronil 40% (80 WG) (38.8 q/ha, 1:1.98) was more effective among all other treatments, followed by Novaluron 10% EC (35.38 q/ha, 1:1.74), Flubendiamide 39.35% SC (33.30 q/ha, 1:1.68), Chlorantraniliprole 18.5% SC (31.20 q/ha, 1:1.53), NSKE 5% (28.90 q/ha, 1:1.40). Beauveria bassiana (24.40 q/ha, 1:1.34) as compared to untreated control plot (19.24 q/ha, 1:1.08). The highest cost benefit ratio was obtained in the treatment of T3 Spinetoram 11.7% SC (1:2.20), followed by T1 Imidacloprid 40% + Fipronil 40% (1:1.98), respectively.
