Stamm- und Wurzelfäulen in Douglasien, Pseudotsuga menziesii (Mirb.) Franco.

The article studies stem and root rot of Douglas fir, Pseudotsuga menziesii Franco. It was found that in 20 year old Douglas fir most of the butt rot was caused by Fomes annosus. Stem decay was central as well as eccentric reaching the sap wood in either case. Comparison of the side roots of 20 year old Douglas fir were done with those of a 40 year old stand with butt rot. It was also found that in individual trees with decay there were less roots with Fomes annosus decay in the younger stand. Calocera viscosa was more abundant in the older stand. Also soil conditions which might have favoured root rot in the young stand are discussed.