９０年代以来，朝阳市大量栽植李树，随之李红点病（Ｐｏｌｙｓｔｉｇｍａｒｕｂｒｕｍ）发病日趋严重。１９９６年是李红点病发生严重的一年，晚红李因病落叶率达８０％—９０％；盖县大李落叶率为２０％—３０％。１９９６—１９９７年我们根据李园微生态平衡的原理，利... Since the 1990s, a large number of trees have been planted in Chaoyang City, and the incidence of Polystigmarubrum has become increasingly serious. 1996 is a serious year of red dot disease, late fall leaves of red plum disease rate of 80% -90%; cover County Dali deciduous rate of 20% -30%. 1996-1997, according to the principle of ecological balance of Li Park, Lee ...