山楂早期落叶病的为害有逐年加重的趋势,有的果园9月中旬落叶率就达70%以上,严重地影响了树势、产量和果品质量.我所从1982年～1985年进行了药剂防治山楂早期落叶病的试验.经过多年的田间观察和沈阳农业大学对病原的初步鉴定,丹东地区引起山楂早期落叶的病害主要有山楂斑点病、山楂褐斑病和山楂斑叶病.发病时期依病害种类不同而异,据岫岩县苏子 The early deciduous hawthorn damage has increased year by year trend, and some orchard in mid-September deciduous rate reached more than 70%, seriously affecting the tree vigor, yield and fruit quality.We have carried out from 1982 to 1985 drug control Hawthorn early deciduous disease test.After many years of field observation and Shenyang Agricultural University on the initial identification of pathogen, Dandong cause hawthorn early deciduous diseases are hawthorn spot, hawthorn brown spot and hawkish leaf spot disease.According to the disease Different types, according to Xiuyan County Suzi