The boundaries of the risk zones are kept under review as the situation develops. The risk zones are used to inform felling guidance, details of English policy can be found in Operations Note 23
Three risk zones have been defined in Great Britain, based on the risk of pathogen spread in each from ‘high’ in Risk Zone 1 to ‘low’ in Risk Zone 3. Attribution statement: Contains OS data © Crown copyright [and database right] [year].
