Phytophthora pseudosyringae

Publication Date
Mon, 06 Jul 2009, 00:00
Last Updated
Dec. 12, 2011, 9:01 a.m.
Report Number
United Kingdom
Pest Id
Phytophthora pseudosyringae - (PHYTPS)
Report Status
Vaccinium myrtillus, Fagus sylvatica, Carpinus betulus, Nothofagus procera
Pest Status
  • Present: at low prevalence
Geographical Distribution
Various natural habitat sites in England, Wales and Scotland.

In January 2009 bilberry plants in woodland in Staffordshire were observed with symptoms of stem dieback, with some plants already dead. It was suspected initially that the plants were infected with Phytophthora ramorum or Phytophthora kernoviae, however, testing has confirmed that the plants were infected with Phytophthora pseudosyringae. In May 2009, symptoms were also found on bilberry plants in a woodland in the south-west of England, which have also been confirmed as infected with P. pseudosyringae. These are the first known reports of P. pseudosyringae on V. myrtillus. In 2007 Forest Research reported findings of P. pseudosyringae on two mature trees of European beech (Fagus sylvatica) and one mature hornbeam (Carpinus betulus) in south Wales. Sampled in 2005, these trees exhibited stem symptoms including bleeding cankers and lesions on the root flares. The trees were originally suspected to be infected with P. ramorum. These were the first records of P. pseudosyringae in the UK and the first record on hornbeam. In 2009, Forest Research identified P. pseudosyringae as the cause of bleeding cankers on Nothofagus procera in Cornwall, another new tree host.

First finding of Phytophthora pseudosyringae on Vaccinium myrtillus (bilberry) in UK. Earlier findings on tree species. Pest Risk Analysis completed and recommended no statutory action. Voluntary non-statutory action is undertaken by landowners as appropriate.
Report files

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