Study on the Synergistic Effect of Carbendazim and Ovraclostrobin against the Two Kinds of Colletotrichum capsici

[Objective] To study the toxicity effect of mixing substance of carbendazim and ovraclostrobin against the two kinds of C.capsici.[Method] The synergistic effect of carbendazim and ovraclostrobin against Colletotrichum nigrum Ell.et Halst and C.G.piperatum Ell.et EV were tested by growth rate method.[Result] The result showed that the EC50 of carbendazim and ovraclostrobin to C.nigrum Ell.et Halst were 1.751 0 μg/ml and 0.481 8 μg/ml respectively,while the EC50 of carbendazim and ovraclostrobin to C.G.piperatum Ell.et EV were 1.163 4 μg/ml and 0.496 5 μg/ml.The toxicity of carbendazim was much lower than ovraclostrobin.Some combinations of carbendazim and ovraclostrobin had synergistic toxicity effect against the two kinds of C.capsici.The synergistic ration(SR) was 1.18-2.57.[Conclusion] These primary research results might provide some useful data for development and application of the mixed fungicides which could control the C.capsici effectively.