As part of the general surveillance for quarantine pests a mature Sweet Chestnut tree was identified with characteristic bark cracking. Subsequent analysis by the Forestry Commission confirmed the presence of Cryphonectria parasitica.
Pest Status (ISPM 8 - 2021)
Present: not widely distributed and under official control
Limited distribution – first found in a public park in St Sampsons, Guernsey, UK
First finding of Cryphonectria parasitica (Sweet Chestnut Blight) on the Island of Guernsey
Cryphonectria parasitica is listed as a quarantine pest not known to occur in Guernsey. No clear pathway could be found for the infection of this mature tree. There are no commercial plantings of Sweet Chestnut in Guernsey, however Sweet Chestnut is a valued tree within the island landscape.