"Roots are deep and leafy". Only when the roots are good can the plants grow well. Therefore, the first thing is to raise the roots. It is suggested that every half month to 1 month or so, root irrigation should be carried out once 1 time, and one of the drugs such as thiophanate methyl, hymexazol or bromothalonil should be used, and the rooting agent should be added to irrigate the roots, which can effectively reduce the dead trees. Pay attention to a large amount of water, and irrigate 4 Liang to half a catty of water in the adult stage. Pay attention to the continuous root irrigation of the plants around the diseased tree for 2 to 3 times, which can effectively control the development of the disease. Watering should be done with small water frequently, and fertilizer should be used in small quantities for many times, among which the amount of chemical fertilizer should be reduced. It is suggested that the application of humic acid fertilizer or root-promoting fertilizer can ensure the normal growth of root system to the maximum extent, pay attention to reducing the application amount of chemical fertilizer, avoid root damage or root burning, and at the same time, properly reduce the poor growth of root system caused by low ground temperature.