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苹果斑点落叶病,是苹果产区的一种危害严重的新病害。我市自1980年前后发生,近几年有加重趋势,其中苇套农场小果树队是重灾区之一。1986年全队1万余株印度、白龙和红元帅苹果树百分之百发病,且比较严重。7月下旬感病果树叶片开始脱落,8月中旬红元帅叶片大部落光,9月10日部分果树第二次开花,病果达40％左右,产量下降,收入减少40％以上。更严重的是,由于提早落叶,树体营养积累少,消耗大,部分果树遭受冻害,去年春死树200多株。为了解决这一问题,我们查阅有关资料,从研
Apple spot deciduous disease, apple-producing areas is a serious new disease. Since 1980, the city has occurred, in recent years have increased the trend, of which reed farm small fruit trees team is one of the hardest hit. In 1986 the team of more than 10,000 strains of India, White Dragon and Red Marshal apple trees one hundred percent incidence, and more serious. In late July, the leaves of infected fruit trees began to fall off. In mid-August, the leaves of the Red Marshes were mostly in the light of the light. On September 10, some fruit trees flowed for the second time, yielding about 40% of sick fruits and decreasing the output by 40% or more. More seriously, due to early deciduous trees, less accumulation of tree nutrients, expensive, some fruit trees suffered frost damage last spring, more than 200 strains of dead trees. In order to solve this problem, we consult the relevant information from the research