1、 Symptoms

At the beginning of the disease, the leaves will have relatively small black dots at the beginning, and then expand slowly with the passage of time. The location of the lesion is black at the edge, dark gray in the middle, accompanied by black spots next to it, until it engulfs the whole leaf and plant

2、 How to treat and prevent

1. If it is found that in the early stage, the diseased part can be trimmed off. It is better to use sharp scissors that have been treated and disinfected, so as to reduce the damage to plants, and then it is better to keep the temperature at about 10 degrees. The cut bad leaves should be burned immediately to avoid infecting other branches and stems

2. The drugs used are mainly bactericidal. Carbendazim or Bordeaux liquid can be used together with water. The whole plant should be sprayed, and no place should be omitted. After spraying, you'd better take it to a windy place to dry

3. Many diseases are caused by too much water, so when maintaining at ordinary times, we should pay special attention to the water supply and reduce the amount of watering. Replace the old soil, sterilize the root again, and then plant it. Pay attention to add more pipe protection and put it in a windy place for maintenance