1、 Leaf spot

Symptoms: the disease mainly occurs on the leaves. There will be near circular or oblong spots with reddish brown color, yellow at the edge and slightly concave down. Then the disease spots will fall off and lead to stem rot in severe cases

Prevention and treatment: don't pour too much water at ordinary times to reduce the humidity of the soil. You can spray Bordeaux liquid for 2-3 times in the early stage of the disease

2、 Soft rot

Symptoms: after infection, the leaves will turn gray yellow, the stem base will appear water soaked soft rot, and the roots will rot and die

Prevention and treatment: apply more phosphorus and potassium fertilizer during the vigorous growth period in spring and autumn, remove the diseased leaves in time after they are found, and spray chemicals at the beginning of the disease

3、 Sunburn

Symptoms: this disease is mainly caused by sunburn, which leads to wrinkle and wilting of the disease, and even water accumulation and decay in severe cases

Prevention and treatment: pay attention to shade, avoid strong light, and strengthen ventilation management

4、 Rot disease

Symptoms: the disease also acts on the leaves. At the beginning, there will be water stains, and then the disease spots will become dark gray and irregular, and dry and sunken in the later stage

Prevention and treatment: spray the soil with bactericide, and spray carbendazim or methyltobuzin at the beginning of the disease

5、 Anthrax

Symptoms: there will be disease spots at the leaf tip or leaf edge, there will be no obvious wheel patterns, and some small black spots will appear on the leaves

Prevention and treatment: cut off the diseased leaves in winter and spring, and spray anthrax Fumei wettable powder or chlorothalonil at the early stage of the disease