Fomes annosus sporocarps - their abundance on decayed logs left in the forest

Abstract

Fluorometrische Beurteilung der relativen SOrResistenz von Fichte (Picea abies [L.] Karst.) 57 Rc'stime Evaluation par fluorometrie de la resistance relative au SO; de l'epicea (Picca abies [L.] Karst.) liee aux metabolites a jaible poids moleculairc des extraits d'aiguilles La resistance relative de I'epicc'a eommun {Picca abies) au SO; est caracterisee par un contenu specifique de metabolites fluorescents dans les ti.ssus de I'aiguille. Ceci a ete demontrc par I'etude fluoromctrique de chromatogrammes en couchc mince d'extraits d'aiguilles contenant des metabolites fluorescents (par exemple des composes phenoliques). Chez pres de 90 "/> des clones testes, le individus relativement resistants (itaieni caracterisiis par des valeurs-tests (cf. chapitre 3-3) de I'ordre de 0,42 a 0,88. Les elones relativement peu resistants ont toujours niontre des valeurs inferieures.Ainsi, la methode telle qu'elle est decrite, apparait comme un outil valabic pour verifier les qualitcs de resistance de l'epicea au SO;.

Occurrence of Heterobasidion basidiocarps on cull pieces of Norway spruce left on cutting areas and in mature spruce stands

“…In the present study, incidence of Heterobasidion sporocarps on cull pieces containing Heterobasidion butt rot ranged from 4% to 30% on different sites. These figures are lower than reported by Schütt and Schuck (1979) from two sites in Germany. They investigated decayed Norway spruce logs left in the forest and found Heterobasidion sporocarps on 26% and 50% (depending on site) of the logs over a 4‐year period after cutting.…”

“…1) was found in Vehkalahti 3 years and in Bromarv K 4 years after logging. This value is considerably lower than that observed by Schütt and Schuck (1979) in Germany, where they found on one site maximally 88 cm 2 and on the other 123 cm 2 of sporocarp area per log metre within 4 years after logging. The large difference can only partly be explained by differences in measuring the fruit bodies; Schütt and Schuck (1979) measured the area of the total sporocarp, whereas in the present work, the area of the active pore layer was measured.…”

“…Such logging residues can provide substrate for fruiting and spore production by Heterobasidion . Schütt and Schuck (1979) showed that Heterobasidion sporocarps can appear as soon as 1 year after logging but the frequency is generally highest and size biggest 3–4 years after logging. However, it is not known whether the numbers of sporocarps occurring on logging residues could significantly increase local spore production.…”

Persistence of some pine pathogens in coarse woody debris and cones in a Pinus pinea forest

“…annosum s.s., a common and pathogenic root and butt rotcausing agent in pine stands, was re-isolated from a high proportion of buried wood blocks incubated in forest soil for at least 3 months thus confirming its capability to persist for a relative long time in buried wood material (Schü tt and Schuck, 1979;Capretti and Mugnai, 1989a). Since the trial was disturbed, it was impossible to assess whether the slight decrease of reisolation success after 3 months of incubation in mixed stands indicated some tendency or this was just an exception.…”

Effects of season and urea treatment on infection of stumps of Picea abies by Heterobasidion annosum in stands on former arable land

“…In such stands, the infection occurs predominantly via basidiospore deposition on freshly cut stump surfaces created by thinning (Rishbeth 1950, 1951, Kallio 1965, 1970, Schönhar 1971, 1975, Yde-Andersen 1978, Schutt & Schuck 1979. Studies made in England show that spore deposition rates can exceed 10 dm" 2 h~' in open stands and 100 dm" 2 h~' in dense stands close to sporophores (Rishbeth 1963).…”