Timo Kurkela

Crown condition as an indicator of the incidence of root rot caused by Heterobasidion annosum in Scots pine stands

Kurkela T. (2002). Crown condition as an indicator of the incidence of root rot caused by Heterobasidion annosum in Scots pine stands. Silva Fennica vol. 36 no. 2 article id 537. https://doi.org/10.14214/sf.537

Abstract

Trees in three Scots pine stands seriously infected by Heterobasidion annosum were classified according to their crown condition into four classes, from healthy to dead trees. After cutting the stands, the classification was compared with the symptoms of annosum root rot on stump surfaces (pitched area) and with the extension of decay in the roots of excavated stumps. When dead trees were included, the average crown condition on the survey plots correlated with disease incidence. Without dead trees the correlation was not significant. Slightly infected trees could not be distinguished from healthy trees on the basis of crown condition. It was concluded that only the proportion of dead and dying trees in a stand is a reliable indication of the disease incidence for making decisions about the future management.

Keywords
Pinus sylvestris; Heterobasidion annosum; root rot; symptoms; disease incidence

Received 28 December 2000 Accepted 28 November 2001 Published 31 December 2002

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