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近些年来我省东部地区落叶松人工幼林普遍发生褐锈病,有些林分受害很重。据我们1980-1981年在丹东、本溪、抚顺等地广大落叶松人工林区进行调查,发病率达80-100％。一般病叶率为30.7％,严重者达95.1％。被害的针叶变黄枯萎,8月底开始落叶,一般提早落叶一个半月左右,严重影响树木的生长。该病害不但能为害幼树,而且幼苗也极易受害。据了解吉林、黑龙江两省的落叶松林区也有不同程度的发生,有些地区危害也很严重。1980年以来我们对该病害进行了观察和药剂防治试验,现将结果分述如下:
In recent years, the brown larch disease generally occurs in Larix principis-rupprechtii in eastern part of our province, and some stands hardest. According to our 1980-1981 Dandong, Benxi, Fushun larch broad-leaved artificial forest area survey, the incidence of 80-100%. The common disease rate is 30.7%, 95.1% in severe cases. Victims of yellowing and withered leaves, the end of August began to deciduous, generally early leaves one and a half months or so, seriously affecting the growth of trees. The disease can not only saplings young, but also vulnerable to the seedlings. It is understood that the larch forest areas in Jilin and Heilongjiang provinces also have different degrees of occurrence, and the damage in some areas is also very serious. Since 1980, we have observed the disease and chemical control experiments, the results are as follows: