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Root rot in north-temperate forest stands

biology, management and communities of associated fungi

Lygis, Vaidotas (2005). Root rot in north-temperate forest stands. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:4
ISBN 91-576-7003-X
[Doctoral thesis]

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The aim of the present thesis was to study the biology and to evaluate possible means of silvicultural control of tree root pathogens Heterobasidion spp., Armillaria spp. and Rhizina undulata. First investigated option was the prevention of Heterobasidion spp. by establishing mixed coniferous-deciduous tree plantations, which would allow thinning delay and thus the absence of stumps that are main infection courts for the pathogen. Results showed that full prevention can be achieved, and that mixed stands also produced a better yield than pure plantations. During the second experiment it was demonstrated that the treatment of stumps with biological (Rotstop) and chemical (urea) control agents can also effectively prevent the Heterobasidion infections, and that the biological control is more environmentally friendly than the chemical. Furthermore, the prevention of loss in forest areas that already were heavily infested by Heterobasidion spp. was investigated. It was shown that in such areas the pathogen persists in root systems of killed trees for decades and readily attacks replanted deciduous trees, e.g. birch. Despite that, the results indicated clearly that the loss could be minimised by replanting the infested sites with more resistant tree species. The investigations of root rot in declining stands of ash led to a hypothesis that saprotrophic behaviour of weakly pathogenic Armillaria cepistipes has been shifted to aggressive pathogenic by some predisposing factor (-s) (possibly - water stress) after at least 20–30 years of latent presence in the area. Population studies of root pathogens in infested sites led to discovery of large territorial clones (up to 50–55 m in diameter) of H. annosum s.s. and A. cepistipes. In case of R. undulata, the evidence of strict both dispersive and territorial clonality was revealed for this species, showing a potential airborne dispersal of the fungus over at least 40 km. Finally, the results of this work showed striking differences between the fungal communities present in stems of healthy, declining and dead trees, indicating that fungal species in wood of living trees change along with changes in tree condition.

Authors/Creators:Lygis, Vaidotas
Title:Root rot in north-temperate forest stands
Subtitle:biology, management and communities of associated fungi
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :January 2005
Number of Pages:39
ALLI. Lygis, V., Vasiliauskas, R., Stenlid, J. & Vasiliauskas, A. 2004. Silvicultural and pathological evaluation of Scots pine afforestations mixed with deciduous trees to reduce the infections by Heterobasidion annosum s.s. Forest Ecology and Management 201, 275-285. II. Vasiliauskas, R., Lygis, V., Thor, M. & Stenlid, J. 2004. Impact of biological (Rotstop) and chemical (urea) treatments on fungal community structure in freshly cut Picea abies stumps. Biological Control 31, 405-413. III. Lygis, V., Vasiliauskas, R., & Stenlid, J. 2004. Planting Betula pendula on pine sites infested by Heterobasidion annosum: disease transfer, silvicultural evaluation, and community of wood-inhabiting fungi. Canadian Journal of Forest Research 34, 120-130. IV. Lygis, V., Vasiliauskas, R., Larsson, K.-H. & Stenlid, J. Fungal infections to stems of Fraxinus excelsior in declining stands, with particular reference to Armillaria cepistipes. Submitted manuscript. V. Lygis, V., Vasiliauskas, R. & Stenlid, J. Clonality in the postfire root rot ascomycete Rhizina undulata. Submitted manuscript.
Place of Publication:Uppsala
ISBN for printed version:91-576-7003-X
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H20 Plant diseases
Subjects:Not in use, please see Agris categories
Agrovoc terms:armillaria, disease control, heterobasidion annosum, root rots, forest stands, population structure, rhizina, fungal diseases
Keywords:Armillaria, disease control, fungal community, Heterobasidion annosum, population structure, Rhizina undulata, silviculture, wood-inhabiting fungi
Permanent URL:
ID Code:715
Department:(S) > Institutionen för skoglig mykologi och patologi
Deposited By: Vaidotas Lygis
Deposited On:12 Jan 2005 00:00
Metadata Last Modified:02 Dec 2014 10:06

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