The efficiency of synthetic insecticides was increased by increasing concentration level and exposure time. Rest of the other synthetic insecticides were showed moderate toxicity index of 42.11 to 62.09%, based on LC 50 values were 1.439 to 0.976 mg liter -1 at 72 h post-treatment. The LC 50 values were 0.606 and 0.774 mg liter -1 for broflanilide and abamectin, respectively, followed by cypermethrin and bifenthrin were showed LC 50 values of 0.803 and 0.906 mg liter -1 at 72 h post-treatment. The broflanilide and abamectin proved to be the most toxic having the highest toxicity index of 100 and 78.29%, respectively, followed by cypermethrin and bifenthrin were showed toxicity index of 75.47 and 66.89%, respectively. frugiperda larvae were susceptible to the tested synthetic insecticides, however, the toxicity index of synthetic insecticides was estimated based on lethal concentration 50 (LC 50), while, LC 50 was calculated from the data of larval mortality. frugiperda larvae at 24, 48 and 72 h post-treatment at five different serial concentrations (10 to 0.625 mg liter -1). The seven synthetic insecticides including novel and conventional belong to four chemical group, spinetoram and spinosad (spinosyns), lambda-cyhalothrin, cypermethrin and bifenthrin (pyrethroids), abamectin (avermectins), broflinilide (diamides), were assessed for their efficiency in causing mortality to second instar S. Chemical pesticides are one of the most important strategies for managing FAW on a short-term basis. Maize is the most essential crop of China and its productivity has been recently endangered by the fall armyworm (FAW), Spodoptera frugiperda.

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