Plant medicament for preventing and treating rice blast

The invention relates to a plant medicament for preventing and treating rice blast, which comprises the following components: 3000g of radix angelicae powder, 5000g of folium mori powder, 3000g of cassia powder, 5000g of common anemarrhena rhizome powder, 5000g of Indian buead powder, 3000g of liquoric root powder, 5000g of dandelion, 2000g of amur corktree bark, 5000g of garlic, 5000g of kitazine. The radix angelicae powder, the folium mori powder, the cassia powder, the common anemarrhena rhizome powder, the Indian buead powder, the liquoric root powder, the dandelion, the amur corktree bark and the garlic are weighed according to the proportion, respectively milled with a hammer and mixed. The raw material and 300kg of water are placed in a large iron pot, which are boiled with high heat for 50minutes and then with gentle heat for 30minutes. Extract is obtained through filtering. The kitazine is added to the extract and then is stirred completely for 30minutes. The manufacture process is finished.