Chalara fraxinea (Ash dieback)

CuPC33 Lab Tests: Positive

Europe-wide; placed on the EPPO Alert List in 2007; causes small necrotic spots, resulting in wilting, dieback of branches and death of the top of the crown. First found in the UK in May 2012 in a consignment of 2000 ash saplings imported from Holland which were distributed nationwide prior to discovery, it has now been found in mature trees in a band from Kent/Sussex through East Anglia to Scotland. It is expected that over 95% of the UK’s ash trees will be infected.