There are many reasons for the falling and falling of the fruit of the pepper. There are both physiological and pathological aspects. Pepper is an environment that is dry and dry, such as high temperature (more than 35 degrees), which affects pollination and fertilization, and easily causes plants to grow long, so that plant assimilation function is weakened, respiratory consumption is increased, and ovary is withered, and filigree Dry shrinkage, resulting in falling flowers, or encountering a long rainy day, so that the light is insufficient, the temperature drops (less than 15 degrees), it will also affect the pollination and elongation of the pollen tube, leading to falling flowers. Soil drought, insufficient water, and large amount of air evaporation will also inhibit the demand for fertilizer and water, causing the fruit to fall. Excessive water and poor permeability make the roots hinder the development of breathing and growth, and even roots can cause falling flowers and fruits. Fertilizer application requires comprehensive nutrient, NPK combined application, excessive or insufficient nitrogen fertilizer or lack of phosphorus and potassium, so that the application of fertilizer is unbalanced, and the supply of various nutrients is not coordinated, which will cause the flower and fruit to fall due to insufficient nutrients or nutrient disorders. Fruit drop. Planting too dense, resulting in poor ventilation, insufficient light, photosynthesis weakened, male flowers are poorly developed, making the first and second layers of flowers easy to fall off. The control measures are as follows: First, the implementation of crop rotation, the selection of resistant varieties, planting healthy seedlings without disease and insects, not planting roots and broken seedlings, rational close planting, improve ventilation conditions, adjust the field microclimate, so that plants have a good growth environment. Second, strengthen the management of temperature and humidity, in the flowering results stage should increase the amount of ventilation, the shed temperature during the day to maintain 20-27 degrees, nighttime temperature is not less than 15 degrees can be day and night ventilation, only good ventilation, plants can grow vigorously, fruit set rate Only high. Third, strict control of fertilizer and water, reasonable fertilization, without watering and topdressing before fruit setting, thereby controlling vegetative growth and promoting reproductive growth, phosphorus and potassium fertilizer should be added when topdressing, reducing the amount of nitrogen fertilizer, entering the flowering period, fruit setting period, fruit rapidly expanding, A large amount of nitrogen, phosphorus and potassium fertilizer is required. Fourth, pepper generally requires air humidity of 55% -65%, soil moisture of about 15%, such as 18% high will affect root development and plant growth, such as 24-hour water accumulation in the field, but to keep the soil moist during the fruiting period. 5. The main diseases of peppers include viral diseases, anthracnose diseases, cotton rot diseases, etc. Viral diseases can also cause plants to shrink and not grow in branches, which seriously affects yield. The viral disease caused by aphids should be thoroughly and earlyly controlled to control aphids, and they can be eliminated in the spotting stage, and can be controlled by acetamiprid, dimethoate and dichlorvos; the aphids can be controlled by moth moth or stone sulphur. Viral diseases can be sprayed with virus A, phytopathology, and the like. Other diseases can be controlled by Plex, nail cream pot, Suikeling, chlorhexidine, carbendazim, carbendazim, methyl thiophanate and other agents. In addition to the above measures, it can also be treated with hormones, such as 2×10-6 2,4-D or (2.5-3)×10-6 anti-fallin, which can prevent the flower from falling. Preservation tubes are swabs with disposable virus sampling tubes to collect DNA tests for disposable nasal flocking sterile medical transport. swabs with disposable virus sampling tubes , to collect DNA tests for disposable nasal flocking sterile medical transport. Jiangsu iiLO Biotechnology Co., Ltd. , https://www.iilogene.com