European Journal of Plant Pathology (2019) 153, 1221-1236

Martin Pettersson, John Frampton, Jonas Rönnberg, May Bente Brurberg and Venche Talgø (2019)
Presence of Phytophthora species in Swedish Christmas tree plantations
European Journal of Plant Pathology 153 (4), 1221-1236
Abstract: 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 Svalöv. 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Jonas Rönnberg, May Bente Brurberg

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phytophthora plurivora	Spruce (Picea)	Sweden
	Phytophthora cryptogea	Spruce (Picea)	Sweden
	Phytophthora megasperma	Spruce (Picea)	Sweden
	Phytophthora gonapodyides	Spruce (Picea)	Sweden
	Phytophthora lacustris	Spruce (Picea)	Sweden