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Many fruit growers do not attach importance to the pruning of fruit trees during growth, letting the tree grow. As a result, the angle between the main branch and the center stem is too small, and in winter, the angle is opened by using multiple sawing methods behind the standing main branch. It is very unscientific and even very harmful. Because the winter tree is in a dormant state, the life activity is extremely slow, and the slicing mouth is difficult to heal. As a result, the bark between the slashes is necrotic and induces rot disease, directly affecting fruit tree production. According to the relevant data, with the increase in the number of saw cuts, the bark necrosis rate and the infection rate of rot disease in the same main branch increased significantly with sawing, and the cut-off distance was 8 cm as the critical value, the smaller the spacing, the Skin necrosis rate and rot infection rate are higher. To this end, to remind the majority of farmers in the use of saw injury to open the main branch angle, should pay attention in the growing period of May and June, the saw injury is generally suitable for two, the depth should exceed half of the main branch, saw the distance between the mouth Keep 6 to 8 centimeters or more, and use a wooden stick to support the opening angle in time to fix it to facilitate close healing of the wound. In addition, after the open angle of the saw injury is fixed, in order to prevent the infection of the rot pathogen, it is also necessary to apply an agent such as Nongkang 120 or bactericidal agent to protect the wound.