华盛顿州果园再植病的防治在华盛顿州中北部，常需在已栽过某种果树的地方再植该种果树。这些再植树发育缓慢，个体间差异大，新梢短，分枝角度小，叶小且浅绿色。这种现象叫果园再植病。感病树虽不至死亡，但保留１０—１５年仍发育迟缓。虽然树体发育状况可通过灌溉、施... The prevention and control of replanting of orchards in the state of Washington in the northern and central Washington State often requires replanting of the fruit trees where the fruit trees have been planted. These replantation trees develop slowly with large differences among individuals, short shoots, small branch angles, small leaves and light green. This phenomenon is called orchard replantation. Sick tree is not dead, but retained 10-15 years still stunting. Although the state of tree development through irrigation, Shi ...