%0 Research article
%T Sensitivity of Picea abies to butt rot in pure stands and in mixed stands with Pinus sylvestris in southern Sweden
%A Lindén, Magnus
%A Vollbrecht, Gudmund
%D 2002
%J Silva Fennica
%V 36
%N 4
%R doi:10.14214/sf.519
%U https://silvafennica.fi/article/519
%X Repeatedly sampled data from permanent experimental plots in southern  Sweden were used to model butt rot development in Norway spruce growing  in pure stands and in mixed stands with Scots pine. The data come from  29 sites with pure spruce, altogether 100 plots, and from 15 sites of  mixed spruce and pine, altogether 22 plots. A logistic model provided  the best fit to the data. The study material revealed that in mixed  stands the proportion of spruce trees with butt rot is lower than in  pure Norway spruce stands. The difference in the incidence of butt rot  cannot be explained by silviculture or windthrow since both factors are  accounted for in the study. The most significant effect on butt rot  development in Norway spruce by an admixture of Scots pine, was found  when the Scots pine admixture was 50%. In order to reduce the incidence  of butt rot in Norway spruce, the study material indicate that there is  little to be gained by increasing the Scots pine admixture to much more  than 50%.