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Titanium dioxide (TiO 2 ) is a nano-optical semiconductor material having a non-toxic, inexpensive, non-corrosive, etc.. In the light conditions, TiO 2 can cause redox reaction, reactive oxygen generates superoxide anion (O 2 - ) and hydroxides . These oxides may be decomposed around the organics, and can kill fungi, bacteria, viruses and other microorganisms, the inorganic antibacterial agent is an ideal. Using this feature, TiO 2 can be used to purify air and water pollution, shows broad application prospects in the field of agriculture. Currently, nano-TiO 2 Photocatalytic kill plant pathogens also rare reported. In this study, improvement and innovation TiO 2 Preparation, explore the TiO 2 prepared reaction conditions, qualitative determination the nanoscale TiO prepared 2 2 cucumber Downy Mildew photocatalytic conditions were preliminary study, the following results were obtained: 1) liquid phase method was successfully prepared nano-TiO TiO 2 and compared to predecessors preparation method, test > The preparation process is simple, the reaction conditions are easier to control, and has many advantages, an improved innovative approach. 2) Testing the influence of several factors on the TiO 2 preparation effects, the results showed that the water quality, the pH value, the reaction time, the heat treatment temperature are TiO 2 preparation effects a greater impact, the test should be noted that the role of these factors. 3) the filter paper method Ciban law, slides, gauze law qualitative determination of TiO 2 activity, different test methods to prove the prepared TiO 2 having a higher activity. In the determination of the activity of the process, light is a limiting factor, i.e. must be in conditions of light, the photocatalyst will play a role. 4) indoor and outdoor efficacy trials results show that nanoscale Tio 2 kill plant pathogens. Field of cucumber downy mildew control effect of 45.37% to 56.87%. Treated cucumber Guayang leaves significantly better than the control and other treatments. In this study, nano-TiO 2 photocatalysis cucumber downy mildew field test results, for in-depth application of nano-optical semiconductor materials in the field of plant protection technical basis.
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