Question to the Department for Environment, Food and Rural Affairs:

To ask Her Majesty's Government which countries in mainland Europe, if any, have tree diseases not present in the UK.

While there is no comprehensive database which records all tree diseases within individual countries, the UK Plant Health Risk Register has 347 entries of pests and diseases which are present in Europe, but not in the UK, of which 126 are known to affect either coniferous or broadleaved trees or both.