A: Falling leaves are caused by many reasons, such as pests and diseases, water and fertilizer, light, and temperature. Under normal circumstances, it is necessary to find the reason from the root. If the leaves are mostly burned after the rain, it is caused by improper fertilization. There are other reasons, such as: too strong light, excessive direct light in the summer will not only eclipse the leaves, but also lead to leaves. Insufficient water supply, walnuts avoid drought, need a lot of water, watering should master the principle of not wet, if found that the soil is dry, the plants will fall due to lack of water. In addition, it is also necessary to always spray water on the foliage and surrounding ground to increase the humidity of the air. When a pest or disease occurs, it should be treated as a medicine.
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