Sunburn is a physiological disease that occurs frequently in bell peppers. First, the symptoms The cause of the disease is strong direct sunlight, symptoms only appear on the sunny side of the exposed fruit, the disease at the beginning of the disease faded, slightly wrinkled, pale or yellowish. In the diseased part, the flesh loses its water and becomes thin. It is nearly leathery, translucent, and tissue necrosis is hard, tight, and easily broken. In later stages, the disease is caused by bacteria or saprophytic infections and grows in black, gray, pink, or labyrinth layers. The diseased fruit is perishable. Second, transmission routes and conditions Sunburn disease is a physiological disease, mainly caused by sunlight burning fruit epidermal cells, resulting in imbalance of water metabolism. The root cause of sunburn is the poor shading of the leaves and poor plant type. The lack of water in the soil, the excessive heat and dry weather, the rain after the rain, the heavy soil, and the low level of stagnant water can all cause the disease. Plant imbalance due to water transpiration, caused by verrucous drought and other factors can induce sunburn. In areas where virus disease occurs more severely, sunburn disease is particularly serious due to epidemics that cause more dead plants and excessive planting. Calcin plays an important role in the water metabolism of pepper, and the loss of calcium in the soil is large, and nitrogen is too much, causing calcium absorption and other physiological factors. It also has a certain relationship with the occurrence of sunburn. Third, control methods 1. Reasonable dense planting and intercropping. Large ridges and double rows of dense plants allow the plants to shade each other and reduce the exposure of the fruits in the sun. Intercropping high-stem crops such as corn and sorghum, using high-stem crops to shade sweet peppers, reducing the incidence of sunburn, and improving the microclimate in the fields, increasing air humidity, and reducing the harm of dry hot winds. 2. Reasonable irrigation. After the result has reached its peak, it should be watered in the morning and grounded in small water to avoid watering in the afternoon. In particular, sticky soils should prevent anoxic drought caused by excessive watering. 3. Root fertilization. Spray 0.1% calcium nitrate after fruit set, spray once every 10 days, and use 2-3 times. 4. Shade net coverage. There can be black shade net coverage, weakening the strong light. Fire Smoke Extractor,Portable Smoke Exhaust Extractor,Mobile fire fume extractor joho(HK) Technology Co. , Ltd. , https://www.joho-safety.com