Measurement of Joint-toxicity of Mixed Biological Pesticides to Aceria pallida Keifer

Joint-toxicity of 1.8% avermectin EC plus 2.5% rotenone EC, 1% matrine AS, 0.5% veratridine EC or 10% imidacloprid SG for control of Aceria pallida Keifer were tested in the laboratory using impregnation method.The results showed that the combined application of 1.8% avermectin EC with 2.5% rotenone EC, 1% matrine AS and 0.5% veratridine EC were significantly synergisted which effective components 1∶1.4 of 1.8% avermectin EC and 1% matrine AS was best significantly synergisted,co-toxicity coefficient was maximal (479.9). While antagonism was experessed by joint-using 1.8% avermectin EC with 10% imidacloprid SG as effective components 1∶11.2, co-toxicity coefficient was 52.3.