Fenoxanil is a parabenamide fungicide, and its resistant and sensitive strains are active. It is particularly effective against grape downy mildew, potato and tomato late blight. It is a new systemic fungicide with excellent treatment, osmotic effect and spore formation inhibition, and is systematically distributed in non-protoplasts. It can be used alone or mixed with protective fungicides. This product has a novel mechanism of action and belongs to the melanin biosynthesis inhibitor (MBI). It has an excellent effect of controlling rice blast in foliar and underwater applications, and has a significant effect. Mainly used to control rice blast, including leaf blast and scour, the best time for application should be 7-10 days before onset, or 5-30 days before heading. The dosage for irrigation is usually 2100-2800ga.i./hm2. For stem and leaf treatment, the dosage is 200-400ga.i./hm2. Mixed with protective fungicides, it can control grape downy mildew, potato and tomato late blight.