Diseases and control of Japanese cherry blossoms

Clubroot

The disease occurs at the root neck on the ground or close to the ground, or may also occur at the junction of the rootstock and scion, causing the plant to be short and grow poorly. Symptoms include the formation of tumors of various shapes at the roots of the plants when the disease occurs. Most of them are brown in color, with a rough surface and often cracks. The prevention and treatment methods are as follows:

Dig out the diseased Japanese evening cherry plants and rinse the soil off the roots. Then soak the roots in 1% copper sulfate solution for about 5-8 minutes, then take them out and rinse them. After that, remove and rinse it. If there is a tumor, it needs to be removed and 0.1% mercuric chloride solution is applied to the wound. Finally, it can be replanted.

anthrax

In the early stage of the disease, circular spots appear on young leaves, and when these spots heal, perforations will form. After June, the leaves become hard, and irregular, rough spots appear on the leaf surface, which are brown in color. In severe cases, a large amount of leaves will fall and buds will die. The prevention and treatment methods are as follows:

Generally, 50% carbendazim wettable granules at 500 times solution, or 70% mancozeb wettable granules at 1000 times solution can be sprayed alternately every 7-10 days for prevention and control. It is necessary to spray 3 or 4 times in a row. It must be noted that the leaves cannot be sprayed during the disease period.

Leaf hole disease

When the disease occurs, initially small gray-brown round spots appear on the leaves, which gradually expand into circular spots with a diameter of about 3 cm. The specific characteristics of the spots are that they have clear boundaries, the outside of the spots are purple-brown, and the inside of the spots are white-brown with ring patterns. After the spots fall off, irregular perforations are formed. The prevention and treatment methods are as follows:

After the disease occurs, spray 1000 times diluted 50% Carranon every 10 days for prevention and control, and spray 3-4 times in a row.