Concerns about the pathogen Thousand Cankers Disease
News - 07 February 2019
During a recent conference the Chief Plant Health Officer, Nicola Spence, voiced concern about the pathogen Thousand Cankers Disease which is not yet in the UK, but urged members of the horticulture and landscape community to be vigilant for.
Thousand Cankers Disease is spread by the North American bark beetle. As the name suggests, the beetle is not native to the UK, but was found in Italy in 2013 likely as a result of trade. Unfortunately, all species of Walnut are susceptible to the pathogen, which results in reduced nut production and mortality. Presently there are no known treatments. Affected trees show symptoms including wilting, branch die-back, crown thinning and cankers. Damage by the feeding habits of the bark beetle result in large numbers of cankers – hence the name.
More information and pictures of symptoms may be reviewed on the Plant Health Portal website:https://planthealthportal.defra.gov.uk/assets/factsheets/Thousand-cankers-disease-pest-alert-July-2016.pdf