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近几年来,我省各地落叶松人工林陆续发现枯梢病,而且蔓延速度快,危害严重.据统计,277万亩落叶松林,已有26万多亩发病.枯梢病主要危害幼苗和幼树,6月中旬开始发病,7月上旬至8月上旬为发病盛期,9月上旬基本停止发病.新梢受害后,由浅绿色变成褐紫色,稍细缢有树脂流出,病梢下垂呈
In recent years, Larch plantations around the province gradually discovered blight, and the spread of fast, serious harm.According to statistics, 2.77 million mu of larch forest, there have been more than 260,000 mu. Shoot blight the main damage to seedlings and young Tree, the disease began in mid-June, early July to early August for the peak incidence, early September basically stopped the incidence of new shoots affected, from light green to brown purple, slightly thin out of the resin outflow, drooping disease was