1986年11月26日在招远县辛庄镇老店村苹果园内,发现一株根部丛生大量须根的苹果树。该树20年生,地上部观察树势极度衰弱,树体矮小。挖去表土,在根基处有一瘤状物。在瘤状物的一侧生出许多细根;在细根上又有许多小的瘤状物,上又生出须状根;须状根上再度生出纤维状根。须根上也有小的瘤状物,但不很明显。挖出后从整体 November 26, 1986 in Zhaoyuan County Xinzhuang Zhen Laodian apple orchard, found a root mass of fibrous roots of apple trees. The tree is 20 years old and the tree top is extremely weak and the tree is short. Dug to the topsoil, at the base of a tumor. On the side of the nodules, there are many fine roots; on the fine roots there are many small nodules, on which the fibrous roots emerge; the fibrous roots regenerate on the fibrous roots. There are also small knobs on the fibrous roots, but not so obvious. After digging out from the whole