Abstract
The role of living stumps in restraining the spread of rots is speculative. However, the pipeline fuiIctiCIn of root-grafts in spreading diseases from one tree to another lhas been reported in oak wilt where the movemnent of spores takes place through grafts (Kuntz and Riker 19'-.6) ; and even fungal hyphae can spread through grafts by breaking down the cell walls of uninfected joinie(d trees (Hafiz Khan. 1910). Also living stumps are usually more resistant to rots than their dead contemporaries. Some are probably completely impermeable by virtue of -a perfect callus cover. If such stumps had not lived, would the rot in their progressively deterioratinig roots have spread to those of the host? Can the inci-dence of root rots in grafted stands be retarded by encouragingZ the formation of living stumps after thinning? These questions can be answered only by furtlher inivestigation.
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