Leaf swelling

The disease occurs quite frequently. At the beginning, there will be some circular spots on the front of the leaves, and the color is basically light yellow. If not handled in time, the color will be more yellow. The more obvious part is the back of the leaf, which is fat and swollen, and also presents a light yellow color. If the treatment is not good, it may cause the petiole to become diseased, deformed and hypertrophic, and the last part of the disease will turn black, and then dry and fall off directly

When you first see white powdery substances, you should quickly remove the diseased parts, and then burn the diseased parts, so that this part of the bacteria will not infect other parts. Before germination, it is best to spray a little medicine, so as to reduce the incidence of disease

Leaf spot

This disease is quite common. Dark brown spots will appear on the leaves. In severe cases, it will also cause the whole leaf to wither and fall off. Because this disease is very likely to occur, it is best to choose a variety that is not easy to get sick. Moreover, prevention and control should be carried out before it occurs. Spray some mixed medicine liquid that can prevent disease first. This operation is best carried out from May to August. Once similar diseases are found, management should be strengthened, and the medicine should be sprayed 7-8 times continuously, once every 10 days. In order to prevent them from yellowing, a little ferrous sulfate can be added

Coin disease

When encountering this disease, there will be a relatively dense white or pink qualitative layer at the location of the disease, and mite galls may also appear on the leaves. This is mainly because the places eaten by aphids and other insects are infected with bacteria, so we should pay more attention to the prevention and control of aphids. Like other diseases mentioned above, if diseased leaves are found, they should be immediately removed and burned, and then applied with medicine