Leaf spot

Black spots on the leaves of Camellia may be caused by leaf spot disease, which is a common Camellia disease. In the initial stage of the disease, dark brown spots will appear on the leaves. With the passage of time, these spots will slowly expand, resulting in large grayish brown patches on the leaves, and some disease spots will be grayish white. There will be many small black spots on the dark brown patches, which will eventually cause the leaves to wither and wither

The reason why Camellia gets leaf spot disease is mostly because the air is too hot and humid, not ventilated, or too much watering. The bacterial spores infect the plants through various ways and spread wantonly, causing camellia to suffer from the harm of disease spots

Treatment: if you get this disease, you must remember not to get water on its leaves, otherwise it will accelerate the aggravation of the disease. Before overwintering, all infected leaves were removed and burned, and then sprayed with stone sulfur mixture. Pay attention to protect the leaves from sunburn and frost. In addition, you can regularly spray liquid medicine for prevention and nutrient supplement, which can reduce the probability of Camellia disease

Bituminous coal disease

If Camellia has bituminous coal disease, black spots will also appear on the leaf surface. These lesions are grayish brown at the beginning, and gradually turn black and expand in the later stage

The disease is generally a fungal infection induced by aphids and scale insects in a hot, humid and poorly ventilated environment. The higher the degree of humidity and heat in the environment, the faster and faster the disease spots spread. The black disease spots after infection will destroy photosynthesis, affect the healthy growth of plants, and do great harm to plants

Treatment: first, prevent from the source, pay attention to the air circulation and sufficient light in the plant growth environment, wipe the diseased leaves with clean water after the disease, and remove the mildew from the leaf surface. However, the inducement of the disease is pests. Therefore, to cure the disease, we need to start from the source, kill all aphids and scale insects that induce the disease, and spray insecticides frequently for prevention in peacetime to maintain the healthy growth of Camellia