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Research article - Peer-reviewed, 2019

Presence of Phytophthora species in Swedish Christmas tree plantations

Pettersson, Martin; Frampton, John; Roennberg, Jonas; Brurberg, May Bente; Talgo, Venche


Phytophthora cryptogea, P. gonapodyides, P. lacustris, P. megasperma, P. plurivora, P. taxon paludosa and an unknown Phytophthora species were isolated from waterways and soil samples in Christmas tree fields in southern Sweden. In addition, P. megasperma was isolated from a diseased Norway spruce (Picea abies) plant from one of the fields in Svalov. Inoculation tests were sequentially carried out with one isolate from each of the three species P. cryptogea, P. megasperma, and P. plurivora, all known pathogens on conifers. The same three isolates were used to study a few morphological features to confirm the identification, and temperature-growth relationships were carried out to see how well the organisms fit into Swedish climatic conditions. Seedlings of Norway spruce and Nordmann fir (Abies nordmanniana) were inoculated in the roots and the stems. None of the isolates caused extensive root rot under the experimental conditions, but all three species could be re-isolated from both Norway spruce and Nordmann fir. Phytophthora root rot is currently of minor concern for Christmas tree growers in Sweden. However, the Phytophthora isolations from soil and water indicate the presence of this damaging agent, which may lead to future problems.


Phytophthora cryptogea; Phytophthora megasperma; Phytophthora plurivora; Abies; Picea; Root rot

Published in

European Journal of Plant Pathology
2019, volume: 153, number: 4, pages: 1221-1236
Publisher: SPRINGER

Authors' information

Pettersson, Martin
Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre
Frampton, John
North Carolina State University
Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre
Brurberg, May Bente
Norwegian University of Life Sciences
Talgo, Venche
Norwegian Inst Bioecon Res

UKÄ Subject classification

Forest Science

Publication Identifiers


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