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本文是对靖县排牙山林场杉木嫁接种子园炭疽病自然发病情况的调查报告。用1977—1982年的调查结果,按各无性系的平均感染指数大小分类,将杉木45个无性系划分为抗病(X)。属于抗病的有5个无性系,占45个无性系的11.11%;中庸的22个,占48.89%;感病的18个,占40%。以10、Ⅲ和20号无性系最抗病,即使进行人工接种也不发病。尤其是20号无性系,是属于生长快(>X+S)的一类,但结实少(<(?))。20号家系的子代也表现较好,其速生抗病的优良性状较稳定,可作为建立高一级种子园和杂交组合的材料。
This article is a survey report on the natural incidence of anthracnose in the grafted seed orchard of Chinese fir in Yashan Mountain, Jing County. According to the survey results of 1977-1982, 45 clones of Chinese fir were classified according to the average infection index of clones. The clones were classified as resistant ( X + S), but less robust (<(?)). The offspring of family 20 also performed better, and the excellent traits of fast-growing and disease-resistant were relatively stable, which could be used as the material to establish the high-level seed orchard and hybrid combinations.