在决定更新区的清肥方法(即根除病树,根除所有胶树,还是都不须根除)的时候,必须考虑根病的情况。在老树已因根病而大量减少的地区,初看起来,上述的第三种方法似乎不值得考虑,然而,我们积累的资料表明,既不需要根除所有胶树,也不需要铲除病树。虽然清肥方法对根病发生率的影响已很清楚,但 The root-cause must be taken into account when deciding on the method of clearing fat in the renewal area (eradication of diseased trees, eradication of all gum trees, or elimination). At first glance, the third approach described above seems worthless in areas where the old trees have been substantially depleted by root causes. However, the information we have accumulated shows that neither the gum tree nor the eradication of diseased trees need to be eradicated . Although the effect of the method of clearing fertilizer on the incidence of root disease is clear,