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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Abstract
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 | ||||
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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: | 2005:4 | ||||
Number of Pages: | 39 | ||||
Papers/manuscripts: |
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Place of Publication: | Uppsala | ||||
ISBN for printed version: | 91-576-7003-X | ||||
ISSN: | 1652-6880 | ||||
Language: | English | ||||
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 | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-467 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-467 | ||||
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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