First, day burn disease 1. Symptoms. The cause of the disease is strong light, and the symptoms only appear on the sunny side of the fruit. At the beginning of the disease, the diseased area faded, slightly wrinkled, and pale or yellowish. In the diseased part, the flesh loses water, becomes thin, nearly leathery, translucent, and tissue necrosis is hard and tight, and it is easy to rupture. 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. 2. Causes. The sunburn disease is mainly caused by sunlight burning the fruit epidermis cells and causing the disorder of water metabolism. 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 cause it. In areas with heavy virus disease, excessive planting, etc., the onset of burning is particularly serious. Calcin plays an important role in the water metabolism of sweet peppers. The loss of calcium in the soil is large, nitrogen is too much, and it causes calcium absorption failure and other physiological factors. It also has a certain relationship with the occurrence of sunburn. 3. Control methods (1) Proper close planting and intercropping. Large ridges are planted in double lines to allow the plants to shade each other and avoid direct sunlight. (2) Reasonable irrigation. After the result is flooded, the groundwater should be filled with small water and watered in the morning to avoid watering in the afternoon. In particular, sticky soils should be protected from anoxic drought caused by excessive watering. (3) Root fertilization. Spray 0.1% calcium nitrate solution after fruit set, applied once every 10 days, and used 2 to 3 times. (4) Use a shade net. Black shade nets can be used to reduce glare. Second, pedicle fruit The sweet peppers that are cultivated in open field and in greenhouses often have peduncles in the process of growth and development. Sweet and pungent pungent fruit and tomato pedicel are the same, are caused by calcium deficiency. High temperature, dryness, multiple fertilizers, and more potassium will inhibit the absorption of calcium, resulting in pedunculated fruit. Plant growth can absorb enough calcium, but the plant vegetative growth is too prosperous, calcium is distributed to the leaf buds, and only a small amount of calcium is distributed in the fruit. In this case, peduncle rot also occurs. Control methods: The soil should be suitable for the development of the root system, take a deep root, and absorb calcium well. Apply more organic fertilizer to make calcium easier to absorb. Third, stone fruit Greenhouse-grown bell peppers, short staminate flowers unisexually strong produce stone fruit. Fruits with few seeds have less distribution of assimilation nutrients and form stone fruit. Continued stone formation on the plant will weaken the plant growth. In the normal flowers of long flowered flowers, when the temperature is too low, the anthers cannot be opened and cannot be fertilized, resulting in stone fruit. Therefore, the night temperature must be kept above 15°C. To reduce the occurrence of stone fruit, good flower buds should be developed and fertilized well, and field management should be strengthened so that the plants can carry out vigorous assimilation. In winter and spring, greenhouse cultivation should pay attention to heat preservation. Four, fallen leaves, falling flowers and falling fruit 1. Symptoms. The deciduous, falling and falling fruit of bell pepper is also known as “three falls†and is an important issue in the production of protected land and open land. In the early period, some flower buds fell off, others were falling flowers, and some fruit stems and flower buds became rust-colored and then fell buds or fallen flowers. Some fruit stems fell off one by one after being yellowed, and some produced late leaves in the middle of production, causing serious losses in production. 2. Causes. Choice of species is not correct. During the back-season cultivation, the temperature during the growth period of sweet pepper was not met, and when the soil temperature was lower than 18°C, the physiological function of the root system decreased, and when the temperature was lower than 15°C, the roots could stop growing and fall and fall. However, anthers cannot be powdered, which can easily cause flowers to fall. In case of a long period of continuous dark weather during growth, insufficient light or relative humidity below 70%, excess nutrients or vegetative and reproductive growth disorders, plant length, low or excessive water content can all lead to falling, budding, or fruit drop. . Insufficient soil fertility, management can not keep up, after planting, the seedlings can not grow quickly and quickly, enter the high temperature season, branches and leaves can not be ridged, resulting in elevated ground temperature, easily lead to false flowers, or fall buds. Pest damage. Unfermented organic fertilizers, especially unfermented chicken manure, are used to cause burning of roots or roots, which may cause the normal supply of water nutrients, and may also cause "three falls." 3. Control methods (1) Choose local-adapted low-temperature, low-light or early-maturing varieties suitable for local conditions. (2) Scientifically determine the sowing time appropriate for the local area so as to meet the requirements for optimum temperature of sweet peppers of 20°C to 30°C and a suitable temperature of 25°C. It is necessary to consider whether the greenhouse temperature meets the requirements, and whether the ground temperature can reach above 18°C, and whether the growing season can cause high temperature damage. In particular, when the ground temperature is more prominent, it can prevent leggy or rot. (3) Attention should be paid to the prevention and treatment of scab, anthrax, viral diseases, tobacco budworms, and tea plants. (4) Using plastic film to cover the cultivation, enter the high temperature season to break the membrane, prevent the soil temperature is too high, conditional available shade net cover. (5) According to the growth of the plant, promote the growth of manure, attack the fruit fertilizer, and return the manure, adopt the formula fertilization technology to prevent the defertilization in the late growth stage, the liquid fertilizer or the plant growth regulator on the foliar surface, and supplement the nutrition. We are a professional Chinese manufacturer of Bio Pesticides;we supply various products of Bio Pesticides, and can providing product images and basic parameters with each Natural Insecticide, Biological Pesticide Plant Pesticide and so on. Such as Matrine Powder, Azadirachtin Powder, Rotenone Liquid, Osthole Powder, Veratrine Powder and so on. Look forward to your cooperation! Matrine Powder,Azadirachtin Powder,Rotenone Liquid,Osthole Powder,Veratrine Powder Xi'an Quanao Biotech Co., Ltd. , https://www.quanaobio.com