%0 Research article
%T Crown condition as an indicator of the incidence of root rot caused by Heterobasidion annosum in Scots pine stands
%A Kurkela, Timo
%D 2002
%J Silva Fennica
%V 36
%N 2
%R doi:10.14214/sf.537
%U https://silvafennica.fi/article/537
%X 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.