It is suggested that different agents such as myclobutanil, dimethoxystrobin, azoxystrobin, pyraclostrobin, fenarimol, triflumizole, flusilazole, difenoconazole, triadimefon, propiconazole and so on should be used alternately in the early stage of rust, and the effect is very good. It is suggested to spray myclobutanil, dimethoxystrobin, azoxystrobin, green princess, pyraclostrobin, oxazolidone, fenarimol, triflumizole, ethirimol, dimethoxystrobin, triadimefon or propiconazole in the early stage of powdery mildew prevention and control.