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三、落叶松枯梢病落叶松枯梢病是我国北方落叶松人工林中新发现的一种危险性真菌病害,为害严重,蔓延迅速。 1.分布与为害该病在1938年发现于日本北海道,1960—1969年仅北海道地区因该病的为害伐除烧毁的落叶松人工林达9700公顷。我国于1973年首先在吉林省汪清和延吉县发现此病,当时仅有零星单株或小团块状分布。现在辽宁、吉林、黑龙江省均有太面积发生。山东省局部地区也已发现该病。据1978年考察,我省受害面积为17万公顷,每年损失生长量达7万立方米以上。
Third, the larch shrubs Shoots Larix shrubs is a newly discovered in China’s northern larch plantation of a dangerous fungal disease, serious damage, rapid spread. 1. Distribution and Harm The disease was discovered in Hokkaido, Japan in 1938. In 1960-1969 alone, only 9,700 hectares of larch plantation were destroyed and destroyed in Hokkaido. China first discovered the disease in Wangqing and Yanji counties of Jilin Province in 1973, when only sporadic individual or small lumpy distribution. Now Liaoning, Jilin, Heilongjiang Province, have too much area. The disease has also been found in some areas of Shandong Province. According to the inspection in 1978, the affected area in our province was 170,000 hectares, with an annual loss of more than 70,000 cubic meters of growth.