Phytophthora Ramorum Risk Zones GB

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.风险区域的边界将随形势发展持续接受复核与动态调整。风险区域可为采伐作业指导提供决策支撑，英格兰地区相关政策细则可参阅《作业指引23》（Operations Note 23）。大不列颠境内共划定三类风险区域，依据各区域内病原体传播风险等级划分，其中风险1区为“高”风险，风险3区为“低”风险。