The present work describes the result of microscopic examinations of some 2,000 borings extracted from 20 to 23-year-old salt-treated poles (Scots pine) from the southern and central parts of Sweden. The purpose was to map out the occurrence of soft rot in Sweden and its influence on the mechanical strength of the poles as well as to contribute to the development of new and more satisfactory methods for inspection of salt-treated poles. The present work is part of a joint project on soft rot, triggered by alarming results from a series of strength tests carried out by Sydkraft AB (Schmidt and Jacobsson 1976). The following companies and institutions were involved in the project: Sydkraft AB, Svenska Reimpregnerings AB Cobra, the Royal College of Forestry, and the Technical University of Denmark.

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