| To better enchance the control efficiency of biological pesticides,reduce the pesticide residues and delay the resistance development,co-toxicity of abamectin mixed with spinosad,pyrethrins,matrine,and rotenone against Schizaphis graminum was conducted by leaf-dipping with aphids method. The results indicated that when the ratios of abamectin to spinosad were 1∶50,1∶75, 3∶100, 3∶350,9∶50,1∶200 and 7∶150,the synergistic effect was significant,and when the ratio was 1∶200,the co-toxicity coefficient(CTC) was 277.3,which was the highest. When the ratios of abamectin to matrine were 7∶270 and 1∶360,the CTC were 171.3 and 222.4,respectively,and the optimal ratio was 1∶360,which gave the best toxicity effect with its LC50 at 32.46 μg·mL-1.The CTC were 196.5,188.7 and 224.7 when the proportions of active ingredients of abamectin and pyrethrins were 4∶1,3∶7 and 7∶3,which was highest with the proportion of 7∶3,and its LC50 was 0.445 μg·mL-1. The CTC were 188.1,189.2,257.4,224.8,and 286.6 when proportions of active ingredients of abamectin and rotenone were 2∶35,9∶70,1∶280,1∶105 and 1∶630,which was highest with the proportion of 1∶630,and its LC50 was 22.017 μg·mL-1. Therefore,the combination of abamectin and different biological insecticides can provide some basis for the effective control of wheat aphid and the reduction of pesticide use. |
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