Prevention and treatment of gentian spot blight disease: The gentian spot blight mainly harms the leaves, and the lesions on the leaves are nearly round, brown, with a light central color and a dark brown edge with a diameter of 3-15 mm. The lesion spreads between the veins, converging in severe cases, and the leaves die. Control method: 1. Soil fertility and soil disinfection: The soil fertility is high, the seedlings grow well, the growth is large, the disease resistance is strong, and the economic output can also be improved. Therefore, generally 300ukg of organic fertilizer and 10kg of diammonium phosphate are applied before the transplanting. At the same time, using 400 times of carbendazim or 800 times of dixon to water the seedbed, the disease index can be controlled below 20%. 2, seedling disinfection: gentian grass seeds and seedlings are carried by bacteria, so seed and seedlings are soaked for 3 to 4 hours before sowing and transplanting with mancozeb 600 times solution. In addition, it is necessary to choose a disease-free strain to keep the seed. 3, reasonable close planting and planting shading crops: In order to reduce the exposure of the ground surface, thereby reducing the contact area between the plant and the soil, generally transplanting 1100,000 seedlings per acre. High-stalk crops such as corn were planted on both sides of the seedbed at a distance of 40 cm from the plant. The main function of the shade is to reduce the direct sunlight to make the leaves of the gentian leaves yellow and reduce the disease resistance of the plants. The cultivation of shady crops has increased the economic income per unit area. 4. Chemical control: Through a large number of drug screening tests and production applications, it is considered that 6O0-800 times of mancozeb is sprayed once every 7-10 days before the onset or early onset, and once every 5-7 days in the rainy season, 600- 8O0 times of mancozeb or anti-virus cockroach, the two are used interchangeably, and the control effect is better. It should be noted that do not step on the plant when spraying, the liquid should be sprayed from bottom to top, and it should be re-sprayed within 2 hours after spraying. Gentian grass is susceptible to viral disease in the spring when it encounters low temperature, which is characterized by leaf shrinkage and chlorosis. The virus-infected plants are first infected by spot blotch. Therefore, once the virus is found, it should be sprayed once every 5-7 days with 800 times of phytopathogenicity, and sprayed 3 times to improve the disease resistance of the plants and ensure stable production. high yield. 5. Destroy the sick body: The dead diseased leaves contain a large number of pathogen spores, which is the main source of infection. Therefore, in the autumn, it is necessary to thoroughly clean up the pastoral areas, do a good job of gardening, and concentrate the litter on the fields. Zhejiang Nanhua Electronic Technology Co., Ltd , https://www.nhloadcells.com