Picoxystrobin is mainly used for the treatment of grain and fruit diseases, such as the prevention and control of wheat leaf blight, leaf rust, ying blight, brown spot, powdery mildew, etc. Its use amount is 250g/hm2; and it is in use In the Chemicalbook barley and apple disease control, it has special effects on diseases that are not effective with azoxystrobin and other agents. After the grains are treated with picoxystrobin, high-yield, good-quality, large and plump grains can be obtained.