1、 Anthrax

Symptoms: This is one of the main diseases of Camellia. Dark green spots will appear at the beginning, and gradually expand into large spots in the later stage. In serious cases, the whole leaf will be damaged and fallen leaves will be caused

Medication: in the early stage of the disease, spray Bordeaux liquid for prevention. Spray potassium dihydrogen phosphate before spreading the leaves. In addition to spraying, the diseased leaves should be completely removed

2、 Red leaf spot

Symptoms: this disease is also very common. It is caused by fungal infection. It mostly occurs on young leaves. At first, it is light brown spots, and then it will gradually spread, and the color will turn brown, which will eventually lead to scorching and falling off of leaves

Medication: at the beginning of the disease, methyltobuzin or sterilized pill can be used. After spraying, it can play a role in prevention and treatment. In addition to spraying, proper water spraying is also required to reduce the occurrence of diseases

3、 Algal spot

Symptoms: the disease is caused by parasitic rust algae. Spots appear on both sides of the leaves, mainly on the leaf surface. At first, small gray green dots appeared on the leaf surface, and then expanded a lot, with almost circular or irregular spots. In the later stage, the color of the lesion changes from grayish green to dark brown

medication: it can be prevented by spraying with 0.2%-0.5% copper sulfate solution. p>