1, too high or too low temperature will lead to flower organ defects, which will lead to flower drop and fruit drop. 2. Too high or too low night temperature, insufficient sunshine, too wet bed soil, and insufficient phosphate fertilizer will all affect the normal differentiation of flower buds, resulting in late flowering and fruiting. 3. Too much root damage and insufficient nitrogen fertilizer when planting in the field, and too low temperature will slow down the emergence of seedlings, leading to late flowering and fruit drop; Pruning in the late growth stage is not timely, too much nitrogen fertilizer, and plants are too lush, which makes the growth and development of plants unbalanced and will also cause flowers and fruits to fall. 4. In some areas, boron deficiency will also cause a large number of flowers and fruits to fall, so we should pay attention to adequate application in base fertilizer. In addition, attention should also be paid to spraying foliar fertilizer on leaves during flowering. 5, too much or too low water will cause falling flowers and fruits. If the soil moisture is too much, it will easily lead to overgrowth and flower falling; If water shortage causes soil drought, it is easy to cause delamination, resulting in a large number of flowers and fruits falling.