Exploring newer molecules with novel modes of action for the management of the invasive maize fall armyworm, Spodoptera frugiperda (J.E. Smith)

Maize is affected by more than 30 insect pests and the recent attack by the invasive fall armyworm Spodoptera frugiperda has been a serious concern to maize growers all over the country. Being polyphagous with a wider host range, the pest necessitates the use of insecticides in the hitherto unsprayed maize ecosystems of the country. Evaluation of newer insecticides against fall armyworm revealed that, the combination insecticide, chlorantraniliprole 9.3% + lambda cyhalothrin 4.6%ZC registered lesser infestation after first round of spraying. However after two rounds of spraying, emamectin benzoate 5%SG, spinetoram 11.7%SC, chlorantraniliprole 18.5%SC, flubendiamide 480%SC and chlorantraniliprole 9.3% + lambda cyhalothrin 4.6%ZC were on par in their efficacy in reducing the fall armyworm infestation, though emamectin benzoate and flubendiamide treated plots registered comparatively higher yields. With respect to B:C ratio, emamectin benzoate and chlorantraniliprole 18.5%SC registered comparatively higher BC ratio followed by flubendiamide 480%SC, spinetoram 11.7%SC and chlorantraniliprole 9.3% + lambda cyhalothrin 4.6% ZC. Thus the above insecticides can be used in maize ecosystems to effectively tackle the fall armyworm menace.