Rice blast: Commonly known as "burning", it is an important disease of rice, which discriminates the symptoms in the field; it harms all parts of rice and occurs throughout the rice growth period. Seedlings; after the onset of disease, they turn brownish and die, and do not form obvious lesions. When wet, they can grow blue-green mildew. Leaf spot: There are two main types, one is an acute type lesion, which is dark green, most of which are round or oval, and the dense blue-green layer on the plaque; the second is a chronic type lesion, which is spindle or spindle-shaped. Peripheral yellow halos, the internal brown, gray center, brown necrotic thread runs through the lesion and extended to both ends, which is an important feature of the disease. In the humid climate, alternating rain and rain, excessive nitrogen fertilizer application, the development of green rice fields prone to acute-type symptoms, and when the air dry disease expansion slow, general acute lesions develop into chronic-type lesions. Leaf sheath spot: often occurs in the part of the leaf sheath connected with the leaf blade, extending to the leaf and sheath, also known as "leaf pillow." Stem joint lesions: dark brown or black spots on the stem section, the lesion spread in the ring in the section, and finally the whole section becomes black, resulting in fractured stem segments, dry ears. Head and neck lesions: often occur in the first panicle below the panicle Department of light brown or black and green color on the panicle, affecting the sturdiness, the formation of white panicles, branches or twigs can also affect disease branches solid. Rice blast is caused by fungal parasitism. The blue-green mold is the conidia of the pathogen. The spread of the disease is transmitted by conidia in the air. The optimum temperature for disease development is 25°C～28°C, and the formation of spores and germination is facilitated by high humidity, and high humidity lasts more than a day and night, which is conducive to the occurrence of disease. Low soil temperature, continuous rain, lack of sunshine is conducive to disease, a large area of ​​planting high quality varieties, poor disease resistance can easily lead to a large area of ​​disease. Partial application, late application of nitrogen fertilizer, are easy to induce rice blast disease. Field control methods: timely check field symptoms based on local forecasts. Rational fertilization of water, at the end of the fertilization, top dressing early, clever supplement panicle fertilizer, apply more farmyard manure, increase nitrogen application of phosphorus and potassium fertilizers, prevent partial application of delayed application of nitrogen fertilizer, in order to enhance plant resistance to disease and reduce the incidence. Chemical control: During the onset of childbirth in Daejeon, the investigation will be conducted every 3 days. The main three leaves of the plant will be examined. If an acute type of lesion is found on the center of the disease or on the leaves, the application shall be controlled. The prevention of panicle blast should be based on the disease condition. Varieties and more fertile fields are used as objects to control the fight time during heading. Application types and dosages, 20% tricyclazole WP for each mu 100 g or 75% tricyclazole 50 g or 40% rice bran (Fuji No. 1), EC 60 to 70 ml watered 50 to 60 kg Constant spray, heavy field spray 2 times, interval 7 to 10 days. Denim abrasion enzymes, fade enzymes, Denim washing enzymes Sunson Industry Group Co., Ltd , https://www.sunsonchinaenzymes.com