利用生长速率法测定了纳米硅、30% DT杀菌剂可湿性粉剂、20%病毒A可湿性粉剂和50%甲霜铜可湿性粉剂4种化学药剂对黄瓜枯萎病菌的抑菌活性，结果发现4种化学药剂对黄瓜枯萎病菌的菌丝生长均无直接抑制作用。利用4种化学药剂诱导黄瓜幼苗抗枯萎病效果的测定结果表明，30% DT杀菌剂可湿性粉剂的诱导抗性效果最好，最高为10.93%；50%甲霜铜可湿性粉剂处理不仅没有诱导抗性效果，反而促进了病害的发生；纳米硅与20%病毒A可湿性粉剂的诱导抗性效果处于二者之间，最高分别为4.08%和6.24%。

The growth rate method was used to determine the antibacterial activity of nano-silicon， 30% DT bactericide wettable powder， 20% virus A wettable powder and 50% metalaxyl-copper succinate wettable powder against Fusarium oxysporum f sp. cucumerinum. The results show that four chemical agents had no direct inhibition on mycelial growth of Fusarium oxysporum f sp. cucumerinum. The effect of 4 chemical agents on anti-blight of cucumber seedlings was determined. The experiment of induction indicated that 30% DT bactericide wettable powder exhibited the best induction effect， and the maximum was 10.93%. The treatment with 50% metalaxyl-copper succinate wettable powder not only did not exhibit effects of inducement， but promoted the occurrence of disease. The highest values of induction effects of nano-silicon and 20% virus A wettable powder were 4.08% and 6.24%， respectively.

S436.421.1

甘肃省农业科学院中青年基金项目(2015GAAS24)；甘肃省青年科技基金计划项目(17JR5RA183)。