The Field Trials of Five Synergistic Insecticides on Cnaphalocrocis medinalis

The field trials of five synergistic insecticides against Cnaphalocrocis medinalis were carried. The results showed that the effects of protective leaves and killing larva of abamectin and chlorpyrifos 17% EC at 204-328.5 g a.i./ha were the highest among five synergistic insecticides. The control effects of fipronil and chlorpyrifos 21% ME at 267.75-315 g a.i./ha and profenofos and fipronil 31.5% EC 189-236.25 g a.i./ha were higher than those of fipronil and profurite-aminium 55% WG at 495-577.5 g a.i./ha and abamectin and fipronil 3.6% ME at 18.9 g a.i./ha. All their effects applied at recommended dosage were similar to better than those of abamectin 1.8% EC at 8.1 g a.i./ha and fipronil 5% SC at 30 g a.i./ha.