Control of dry rot of apple seeds

Apple dry rot, also known as carcass rot, is one of the most important diseases of apple trees.

1. Symptom

When young trees are injured, dark brown to dark brown disease spots are formed near the grafting site at the initial stage, which expands upward along the trunk and will die in severe cases, and there are many raised small black grain spots on the disease spot. When the tree is injured, the wet irregular dark brown disease spots are scattered on the branches, and the diseased part spills over thick brown mucus. When the disease spot develops seriously in the longitudinal direction of the branch, it will cause the disease of the whole branch, and the water loss of the disease spot will form obvious sunken dark brown dry spot in the later stage. The junction of the disease and health is often cracked, the skin of the disease is raised and peeled off, and many small, dense, raised black spots appear on the surface of the disease spot. When the disease is serious, the bark tissue dies, and finally it can rot to the xylem, and the whole branch dies.

The disease of the fruit first appeared on the sunny fruit in the upper part of the crown, and then expanded into round or amorphous light brown spots, and gradually expanded into concentric striated spots. Under suitable conditions, the disease spot expands rapidly and the whole fruit can rot in a few days. In the later stage, black particles can be produced on the surface of the lesion.

two。 Prevention and cure method

① should strengthen cultivation management, deeply turn over the soil, increase the application of organic fertilizer, timely drainage and irrigation, enhance the disease resistance of trees, and reduce tree wounds as much as possible.

② cleared the diseased branches from the trees and burned them centrally.

After scraping the diseased skin with ③, it can be smeared with 40% Fumi arsenic 50 times diluent.

④ in late autumn and early winter or early spring bud, the whole tree sprayed 40% Fumei arsenic 100x diluent to clear the garden to eradicate germs. Usually combined with the prevention and control of other diseases spray Bordeaux solution, chlorothalonil and so on.

For ⑤ to prevent fruit from being infected, you can refer to the prevention and control methods of apple ring disease.