(I) Symptoms: The root rot of apples is mainly responsible for the roots of the plants, and they first develop from the roots, form red-brown round spots around the fibrous roots, and then spread to the large roots connected to the fibrous roots. The lesions expand and connect to each other and go deep into the xylem. Make the whole root black and die. There are four types of symptoms in the upper part of the fruit tree after the leaves are displayed in April-May:
1 wilting type: The whole or part of the branches of the diseased plant grows weak after sprouting, the leaf clusters are wilting, the leaves are curled upwards, the shape is small and the color is light, the new shoots are difficult to pick, and some even the buds cannot shrink, or After flowering, the fruit can't result in water loss, and even the cortex can shrink or die.
2 Leafy dry type: In early spring or when the temperature is high, the diseased leaf suddenly loses water and dryness. Most of the diseased leaves develop inward from the leaf margin, or extend inward along the main vein. There is a clear boundary between the dry and healthy tissues. Red-brown halo with severely dry leaves falling off.
3 Leaf margin coking type: The tip or edge of the diseased plant leaves are defocused, while the middle part remains normal, and the leaves do not fall off quickly. In many years of the rainy season, the disease develops slowly and is the main symptom of the disease.
Four branches of the blight type: a few of the main branches corresponding to the rot roots of the diseased plants are necrotic, the diseased parts become depressed, and spread along the branches. In the late stage of disease, the necrotic cortex is easily peeled off, which is a special symptom presented by partial large root rot.

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