01628nas a2200181 4500008004100000022001400041245007500055210006900130260001200199300001400211490000700225520104200232100001601274700001601290700001601306700001201322856011201334 2003 eng d a1437-478100aFirst records of soilborne Phytophthora species in Swedish oak forests0 aFirst records of soilborne Phytophthora species in Swedish oak f c06/2003 a175 - 1790 v333 a

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.

1 aJönsson, U1 aLundberg, L1 aSonesson, K1 aJung, T uhttps://forestphytophthoras.org/references/first-records-soilborne-phytophthora-species-swedish-oak-forests