1. Continuous cropping: Continuous cropping is the most serious problem affecting the normal growth of bean crops, which will not only lead to flower and pod dropping, but also lead to premature drying of plants, which may lead to low yield and poor quality, or even no harvest at all.
2. Unbalanced fertilization: Overnutrition leads to dense growth of branches and leaves, cluster of top stems and leaves, and imbalance between stem and leaf growth and flowering and pod setting, leading to flowering and pod dropping. Malnutrition causes leaves to turn yellow and thin, and flowers and pods fall off due to lack of nutrition.
3. Environmental factors: too high temperature, too high humidity, rainy days, too high planting density, no ventilation, etc. These problems will lead to the decline of pollen vitality, which can not be pollinated normally and fall off.
4. Pests and diseases: such as bean mites and aphids will lead to falling flowers and pods.
In order to promote the growth of green beans, it is necessary to carry out scientific management, ensure adequate water and fertilizer supply, and pay attention to the prevention and control of pests and diseases.