Grape root swelling and rot is a symptom of grape root rot: first, it occurs on fibrous roots, forming reddish-brown circular spots, which expand and connect with each other, and gradually penetrate into xylem, first becoming reddish-brown, brown, and finally becoming dark brown to death. Some symptoms above ground: wilting in growing season. Leaves wilting, leaves curling upward, leaves small color light, it is difficult to shoot new branches, buds shrink without cracking or fruit setting rate is extremely low, branches lose water, shrink or die, which mostly occurs in plants over 4 years old. Qinggan type. After root infection, the diseased plants developed rapidly. When the spring is dry and the temperature is high, the leaves of diseased plants suddenly lose water and wither, and most of them develop inward from the leaf margin or expand inward from the main vein. There is an obvious flush zone between the diseased part and the healthy part, and the leaves fall off in severe cases. This symptom mostly occurs in young parts. Leaf edge scorched type. There is no drought in spring and the disease develops slowly. At the time of onset, the tip and edge of leaves are scorched, but generally they do not shed leaves. (4) dead branches. Rotten roots and branches corresponding to rotten roots die, the cortex turns brown and sunken, the boundary between good skin and bad skin is clear, the necrotic cortex falls off in the later stage, and the xylem vessel turns brown. Pathogens and infections. Rhizoctonia solani is mainly caused by Fusarium oxysporum, Fusarium oxysporum and Fusarium oxysporum, all of which live in soil and rot in soil. Only when the tree is weak can it get sick and bacteria can spread through the water in the soil. Underground pests, soil with bacteria and gardening tools can spread diseases. Most pathogens invade from the wound, and the infection can be completed in 3 days when the conditions are suitable. After infection, the tree is strong and not sick, but lurking. When the tree is weak or infected to a certain extent, symptoms begin to appear, usually after 1 year and 2-3 years of infection. Prevention and control measures, reasonable garden construction. Spraying 100 times of sodium pentachlorophenol on the ground; Spraying plant ash on the ground changed the soil pH and destroyed the living environment of bacteria. Spread ferrous sulfate on the ground. Avoid low-lying and waterlogged wetlands and build gardens. If the groundwater level is above 1 m, high ridges should be used to plant or dig drainage ditches to prevent the water level from rising. Before planting, dig a planting ditch with a depth of 1 m according to the row spacing, and apply more than 5000 kilograms of organic fertilizer per mu. Build a garden with virus-free seedlings. Try to build a garden with grafted virus-free seedlings, and the grafted rootstocks should be Peking University and Jufeng. Improve the cultivation conditions, plant grass, water timely, drain timely, prevent soil erosion, load trees reasonably, and avoid bearing fruit in different years. Strengthen the prevention and control of pests and diseases on the ground. Chemical control. Before germination and at the beginning of symptoms, irrigate the roots with 200-500 times of copper sulfate or Pomei 1 degree stone sulfur mixture, 200 times of Nongkang 120 water solution, 200 times of shuangxiaoling or 300 times of duoxiaoling.