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First records of soilborne Phytophthora species in Swedish oak forests

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Thirty-two oak stands in southern Sweden, 27 with predominantly declining trees and five with a higher proportion of healthy trees were investigated regarding the presence of soilborne Phytophthora species. Phytophthora quercina, an oak-specific fine root pathogen, was isolated from rhizosphere soil samples in 10 of the 27 declining stands. Additionally, P. cactorum and P. cambivora were recovered from one stand each. No Phytophthora species were isolated from the healthy oak stands. The soil conditions at the sites from which Phytophthora spp. were recovered ranged from mesic sediments to moraines, with clayey to silty textures and with soil pH (BaCl2) between 3.5 and 5.0. The results show that P. quercina is geographically widespread in oak stands in southern Sweden and indicate that this pathogen may be one of the factors involved in oak decline in Northern Europe as has already been shown for western, Central and parts of southern Europe.
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Document Type: Research Article

Affiliations: 1: Department of Plant Ecology, Ecology Building, Lund University, SE-223 62 Lund, Sweden. ;, Email: [email protected] 2: Department of Forest Ecology and Forest Protection, Bavarian State Institute of Forestry (LWF), Am Hochanger 11, D-85354 Freising, Germany

Publication date: 01 June 2003

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