Abstract: Through field trials, the efficacy of two synergistic mixtures, isoprocarb+abamectin 24% EC and profenophos+abamectin 35% EC, to Spodoptera exigua Hübner larvae were assayed in Qingzhou, Shandong Province in 2002 The effects of isoprocarb+abamectin 24% EC were significantly better than that of isoprocarb 25% EC and abamectin 1.8% EC. In the application rate of 50 g/667m² the correct mortality isoprocarb+abamectin 24% EC after 3, 7, 10 days were 82.38%, 87.49% and 88.90% respectively; in 37.5 g/667m² , the corresponded control effects were 78.21%, 8397% and 85.24% respectively. The correct mortality of profenophos·abamectin 35% EC in the application rate of 50 g/667m² after 3, 7, 10 days were 86.15%, 91.37% and 91.32% respectively; in 37.5 g/667m^{2, the corresponded control effects were 80.73%, 87.40% and 88.39% respectively. This synergistic mixture possessed a quick action, good residual performance and relatively low cost guarantee for the good control effect in the field.}

Key words: Isoprocarb, profenophos, abamectin, synergistic mixture, Spodoptera exigua； field control efficacy