1、 Causes of occurrence

1. It may be caused by water. Too much water will make the frontal root system of the spider unable to breathe, so that the plant will wither and the leaves will wilt, and too little water will also cause this situation. Therefore, its supplementary water should be poured after the water is dry

2. To give it plenty of light, long-term absence of sunlight will make the leaves of plants fall off as soon as they touch, or even grow in vain. Therefore, it should be kept in a sunny place for maintenance, and avoid violent light

3. The use of fertilizer should be appropriate, not too much or too little. It only needs to apply more fertilizer in its growing season, and less fertilizer in other seasons. And the concentration of fertilization should not be too large. It is appropriate to apply dilute fertilizer. The fertilization time is usually once every 10 days

4. In addition, there is another possibility that it is caused by the invasion of the disease, so we need to observe it in time. If we find the disease, we should spray medicine immediately for prevention and control, and trim the necrotic leaves in time