The mango in the picture is in full bloom. It can be seen that: 1. A black spot or a group of black spots appears on the flower stem, which is mainly due to anthracnose. 2. A small white powder layer appears on the side flower stems, which is powdery mildew. 3. Black spots and dried flowers appear on the flower grains, which is suspected to be caused by a combination of downy mildew and anthracnose. The three problems mentioned above are caused by the continuous low temperature, rainy or drenching weather during the flowering period, so many diseases will occur together, and they will also coexist with bacteria. Because the mixed bacteria occur, the speed of transmission will spread throughout the entire plant. In orchards, if simple fungal diseases occur, the spread speed is generally relatively slow. With so many mixed diseases, it is recommended to use azoxystrobin and dimethomorph together with Jiasheng rice to prevent and control diseases. To protect flowers and fruits, you can use calcium boron and brassinolide, and choose according to the specific situation after 4-5 days. Chemical control. The peak flowering period is the period when the mango tree consumes the most nutrients, and is also the period when the body is the weakest and most sensitive. Therefore, if you take good care of the tree in advance and prevent tree diseases, you can cope with the problems caused by bad weather. Otherwise, if there is a serious problem during the flowering period, Diseases require more investment in prevention and control, and may not be completely controllable. Even if the diseases are controlled, the results will be scarred.