The study analysed the occurrence of white pocket rot in older pine stands. Analyses were conducted during cutting operations, which provided an opportunity to examine each felled tree in terms of the occurrence of heartwood rot. Based on observations it was found that the actual share of trees infested by Porodaedalea pini considerably exceeds the number of trees with external symptoms. Most frequently the range of rot caused by P. pini covered sections from the root swelling to a heightof 5 m.

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