Eggplant brown leaf disease is an important disease of eggplant, only harm eggplant, if the prevention and treatment after the onset of disease can cause great losses, seedling disease caused by the lack of strains, the resulting disease caused by fruit rot. First, the symptoms. It can be affected from the seedling stage to the fruit ripening stage. After the seedlings become sick, they often produce brown to black fusiform or elliptical lesions near the base of the ground stem. The pits shrink slightly. When the lesions surround the stem circumference, the diseased part collapses, the seedlings die down and the big seedlings form a stubble. . In the adult stage, the leaves develop white spots, and then gradually expand into irregular spots. The edges are dark brown and the middle is light yellow. There are many small black spots on them. They are arranged in a roulette pattern or scattered. Stems infected with ulcer lesions, lesions edge dark brown, central gray, dense black spots above, after the disease Department depression, dry rot, cortical detachment, xylem exposure, easily broken by wind and dead. The fruit is susceptible to disease. It initially forms a brown spot on the surface. It has a round or oval shape. It is slightly sunken and then expands to the whole fruit. The diseased part consists of small dark spots that make up the obvious ring veins. The diseased fruit is finally soft rot and falls off. And become a stalemate. Second, the incidence of law. Brown leaf mustard is a fungal disease. The pathogen is attached to the surface of the seed with a conidiophore, or latent in the seed coat with the mycelia, or it is overwintering in the soil with the residue of the diseased plant. The seed colonization often causes the seedling to stumble. Withered, soil bacteria often cause stem base ulcers, and the resulting conidia further invade leaves, stems and fruits. Spread by wind and rain or insects, directly invade through wounds and epidermis. The optimum temperature for the development of pathogens is 28-30°C and the relative humidity is more than 80%. General high temperature and humidity, condensation and rain, is conducive to the occurrence and prevalence of diseases. Continuous cropping, excessive density, excessive nitrogen fertilizer or defertilization make the plants grow weaker, or low-lying and poor drainage, summer rain, etc., can cause morbidity or aggravate hazards. Third, control methods 1, the implementation of rotation. The pathogens in the soil can survive for 2-3 years. Rotation cultivation for more than 3 years can eliminate soil pathogen damage. 2, choose disease-free seeds and seed disinfection. Self-retaining seeds should be seeded from disease-free plants. The purchased seeds should be sterilized by soaking in warm water at 55°C for 15 minutes or soaking in warm water at 50°C for 30 minutes, or using 300 times formalin. Soak for 15 minutes, wash with clean water and dry to dry. 3. Disinfection of seed bed medicaments. Should choose to nurse in the new seedbed, bed soil can be replaced by soil and soil, and soil disinfection. Use 10% of 50% carbendazim WP or 4g of 40% pentachloronitrobenzene wettable powder per square meter, and evenly mix with 20 kg of dry fine soil. Species. 4, strengthen the cultivation and management. Careful management of seedbeds, nurturing and transplanting of strong seedlings to improve their resistance to diseases; implementation of ridge cultivation, adequate base fertilizer. Nitrogen, phosphorus and potassium are used in combination; in the rainy season, drainage is conducted in a timely manner to prevent the accumulation of water in the field; in the middle and later stages of fertility, small water ground irrigation is performed to reduce the humidity; the diseased leaves and fruit are removed in time to prevent re-infection. 5, the implementation of chemical control. Spray protection during seedling stage, spraying control at the initial stage of disease. Usually about 7 days spray 1, even spray 2-3 times. The agent used was 70% mancozeb WP or 50% Ketodac WP, 65% zeocin WP 500 times, or 75% chlorothalonil WP 600 times. In addition, spreading a layer of plant ash on the ground around the stem base after colonization can reduce the incidence of basal infection. Rongcheng Jingyi Oceanic Technology Company Limited , https://www.jingyifoods.cn