1、 Cut off diseased leaves

White spots on Milan leaves are germs that produce spores to spread infection. Therefore, the diseased branches and leaves should be cut off at the first time, and it is best to burn them. Avoid the residue of bacteria, leading to secondary recurrence

2、 Ventilation and dehumidification

The main cause of algal spot is poor ventilation. Indoor breeding is the most likely to happen in Milan, so we should strengthen air circulation. The first is to change the growth environment and put it on the balcony or windowsill to avoid being too close to other plants. The second is to trim the over dense branches and leaves to ensure good internal ventilation. At the same time, humidity is also the key to pathogen parasitism. It is necessary to loosen the soil properly or put desiccant indoors to reduce the humidity

3、 Drug control

In the early stage of leukoplakia, Bordeaux liquid or stone sulfur mixture can be used for prevention and control. Drug spraying has certain limitations. Generally, it can only be sprayed to the white spots, but some transmitted micro bacteria can not be seen. If the condition is serious, it will only treat the symptoms but not the root cause, and it will recur again

4、 Water and fertilizer control

When watering at ordinary times, pay attention not to let the soil be too wet, which will cause the breeding of bacteria. At the same time, fertilization should also be balanced. Organic fertilizer can effectively improve the disease resistance of plants. Do not apply phosphate fertilizer, only pay attention to its flowering and ignore its health