Heartwood stump colonisation by Heterobasidion parviporum and H. annosum s.s. in Norway spruce (Picea abies) stands

摘要: Abstract Stump-to-tree spread is a key step in the root and butt-rot disease caused by Heterobasidion annosum sensu lato . In Norway spruce stands, parviporum more likely to neighbouring trees from stumps with large diameter than small stumps. However, H. stricto does not appear share this pattern of infection. Given that ratio heartwood sapwood varies depending on size stump, we investigated role stump infection s.s. To determine whether heartwood–sapwood susceptibility was different host species, both Scots pine were included study. Sapwood, border zone between artificially inoculated genotypes parviporum. Only one per stump. Infection assessed 2 10 months after inoculation at 5 30 cm below point inoculation. On stumps, mostly confined heartwood. The area infected smaller Both infections tended grow towards heartwood, whereas inoculations remain indicating favourable for colonisation pine, failed only found sapwood. Our results suggest possible association mediated content, suggesting screening resistance could be potentially interesting direction future research. Treating final felling would advisable owing exposed operation.