Studies on Inhibitory Effects of Nano-Cu_2O on Phytophthora capcisi and Fusarium oxysporum of Pepper

Using the special characteristics of nanometer materials to develop nanoscale germicides is a new area of germicide research and development.To investigate the inhibitory effects of nano-cuprous oxide(Cu2O)on Phytophthora capcisi and Fusarium oxysporum of pepper(Capsicum annuum L.),5 concentrations of nano-Cu2O,i.e.250,500,750,1 000,1 250 mg·kg-1 were prepared and drug-containing medium were used for conducting the toxicity test.The results indicated that under the same concentration,the inhibitory effects of nano-Cu2O on Phytophthora capcisi were better than those on Fusarium oxysporum.The inhibitory effect was positively correlated to concentration,and correlation coefficient was over 0.97.The EC50 was 135.4 mg·kg-1 and 706.2 mg·kg-1 for Phytophthora capcisi and Fusarium oxysporum,respectively.Nano-cuprous oxide had significant effects on pepper Phytophthora capcisi.