%0 Research article
%T Logging operation damage to roots of clear-felled Picea abies and subsequent spore infection by Heterobasidion annosum
%A Rönnberg, Jonas
%D 2000
%J Silva Fennica
%V 34
%N 1
%R doi:10.14214/sf.642
%U https://silvafennica.fi/article/642
%X Two studies were carried out to examine the effects of clear-felling  operations on stump roots of Norway spruce (Picea abies (L.) Karst.). In  study I, the number of cases and the degree of damage to stump roots of  Norway spruce were investigated on three clear-felled sites in northern  and southern Sweden respectively. The cutting was done in winter or  spring. A mean of 37% of the stumps had signs of root damage caused by  clear-felling operations. Study II was carried out on two sites in  southern and two sites in northern Sweden. The trees were clear-felled  in June or July. The frequency of natural infection by Heterobasidion  annosum (Fr.) Bref. through damaged roots was compared to infection  through stump surfaces. The total area of damage on roots was 88% of the  stump surface area. On average, 54% of the stumps were infected through  the stump surface and 19% through locations of root damage. The root  infections, however, were generally small in size as compared to stump  surface infections. The study shows that damage to roots at  clear-felling may be extensive, but this probably is not of great  importance for the efficacy of stump treatment against H. annosum.