The main problem in onion farming is the high risk of crop failure caused by Spodoptera exigua attacks. The technology in controlling the onion caterpillar (Spodoptera exigua) is by using biological agents. This study aims to determine the effect of biological agents in reducing the population of Spodoptera exigua, on shallots. This study consisted of 5 treatments using a consortium of biological control agents (APH) as antagonists (Ma) and entomopathogenic fungi, Beauveria bassiana (Bb) in combination (0, 5, 10, 15, 20 ml L-1). The results of this study showed that the concentrations of 20 ml L-1 and 10 ml L-1 in the first and third applications could reduce the population of Spodoptera exigua onion caterpillars, compared to controls. at harvest the number of tubers did not show a significant difference between treatments. The concentration treatment of 15 ml L-1 showed that the highest tuber weight was 1172.29 g plot-1 (277.395 kg.m-2) or equivalent to 693.661 kg.ha-1 and the lowest tuber weight was in the control, namely 1113.18 g. .plot-1 (263,431 kg.m-2) or the equivalent of 658,685 kg.ha-1.