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Heterobasidion root rot in Norway spruce

modelling incidence, control efficacy and economic consequences in Swedish forestry

Thor, Magnus (2005). Heterobasidion root rot in Norway spruce. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:5
ISBN 91-576-7004-8
[Doctoral thesis]

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In spite of its biological and economic impact on Swedish forestry, root rot caused by Heterobasidion annosum (Fr.) Bref. sensu lato has received no or little attention in forest planning. This thesis summarizes and discusses two experiments involving prophylactic treatment of stumps, and three investigations on the modelling and simulation of root rot in coniferous stands with special emphasis on Norway spruce (Picea abies [L.] Karst.). In 14 previously unthinned stands of Norway spruce, the efficacy of mechanized stump treatments with disodium octaborate tetrahydrate (DOT), Phlebiopsis gigantea (Fr.) Jül. and urea was compared with no treatment of stumps cut in the summer and winter, and with manual treatment. Stump treatment reduced the stump area colonized by H. annosum s. l. by 88-99% as compared with untreated stumps cut in the summer. In terms of colonized stump area, there were neither differences between compounds, nor between mechanized and manual treatments. Sensitivity of root rot antagonist P. gigantea spores to high temperature or pressure was tested in laboratory and field experiments using a mechanized application. The spores withstood 1,600-2,200 kPa for 24 h without losing viability. Spore germination of P. gigantea had an optimum at c. 30ºC. Mechanized application under normal summer conditions in Sweden did not obstruct spore germination of P. gigantea. Functions for predicting the probability of decay in individual trees were developed using logistic regression from data in the Swedish national forest inventory 1983-2001. The functions use data readily available in most stand records, and are recommended for strategic, tactical and operational planning. Models for simulation of disease development were developed based on known facts about the mode of infection and spread of H. annosum s. l. in Fennoscandian coniferous forests. The economic outcomes for a number of stands typical of Swedish forest management were modelled and predicted using the models for H. annosum s. l. dynamics and models for cross-cutting of trees. Stump treatment in thinning and previous final felling was profitable (interest rates 1, 3 and 5%) in pure stands of Norway spruce and in mixed conifer stands in southern Sweden.

Authors/Creators:Thor, Magnus
Title:Heterobasidion root rot in Norway spruce
Subtitle:modelling incidence, control efficacy and economic consequences in Swedish forestry
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2005
Number of Pages:50
ALLI. Thor, M & Stenlid, J. Heterobasidion annosum infection of Picea abies following manual or mechanized stump treatment. Scandinavian journal of forest research. (Accepted.) II. Thor, M., Bendz—Hellgren, M. & Stenlid, J. 1997. Sensitivity of root rot antagonist Phlebiopsis gigantea spores to high temperature or pressure. Scandinavian journal of forest research, 12, 356-361. III. Thor, M., Ståhl, G. & Stenlid, J. Modelling root rot incidence in Sweden using tree, site and stand variables. Scandinavian journal of forest research. (Accepted.) IV. Pukkala, T., Möykkynen, T., Thor, M., Rönnberg, J. & Stenlid, J. Modeling infection and spread of Heterobasidion annosum in even-aged Fennoscandian coniferous stands. Canadian journal of forest research (in press). V. Thor, M., Arlinger, J.D. & Stenlid, J. Heterobasidion annosum root rot in Picea abies – modelling economic outcomes of stump treatment in Scandinavian coniferous forests. (Manuscript.)
Place of Publication:Uppsala
ISBN for printed version:91-576-7004-8
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:heterobasidion annosum, picea abies, root rots, biological control, chemical control, forest management, planning, sweden
Keywords:biological control, chemical control, disease management, forest management, operational planning, strategic planning, tactical planning
Permanent URL:
ID Code:729
Department:(S) > Institutionen för skoglig mykologi och patologi
Deposited By: Magnus Thor
Deposited On:18 Jan 2005 00:00
Metadata Last Modified:02 Dec 2014 10:06

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