Chestnut Survey GB 10K Grid 2013

Stands surveyed to determine whether Chestnut blight (Cryphonectria parasitica) and/or Chestnut gall wasp (Dryocosmus kuriphilus) are present in 17 forest stands of Sweet chestnut (Castanea sativa) located across seven forest districts in England a Wales. There are no comercial stands of chestnut in Scotland
The EU Plant Health Directive was amended in 2005 to recognise a new protected zone within the Community in respect of Cryphonectria parasitica, the cause of Sweet Chestnut blight (Commission Directive 2005/18/EC of 2nd March 2005). At the same time it was decided to set up a monitoring programme for Dryocosmus kuriphilus, the oriental chestnut gall wasp (Commission Decision 2006/464/EC); which is considered as a likely plant health risk.
These changes to the EU Plant Health Directive will impact on movements of wood and bark of Castanea sativa (Sweet Chestnut) within the EU Member states, unless they have been granted Protected Zone (PZ) status. This is in response to a gradual spread of C. parasitica in continental Europe and pressure on the EU to change the status of this disease. The Directive recognises the UK (including the Channel Islands but not the Isle of Man) as one of the Protected Zones. As a result, plant passporting controls throughout the EU will, from 15th May, be confined to plants for planting; with plant passport controls applying to wood (unless stripped of bark) and isolated bark moving into and within the protected zones. In order to maintain our PZ status, and controls on movements of wood and bark of C. sativa, we are obliged to carry out annual surveys to demonstrate continued freedom from this disease.
No surveyed trees showed symptoms of Chestnut blight or Chestnut gall wasp.

Count - Number of sites surveyed in grid square

Year - Year in which sites were surveyed. Attribution statement: Contains OS data © Crown copyright [and database right] [year].

为确定栗疫病（Cryphonectria parasitica）及/或栗瘤蚜（Dryocosmus kuriphilus）是否存在于英格兰及威尔士七个森林区域内的17处甜栗（Castanea sativa）森林立地，进行了实地考察。苏格兰地区不存在商业栗树种植。2005年，欧盟植物卫生指令进行了修订，以承认共同体内部针对栗疫病病原体Cryphonectria parasitica的新保护区（欧盟委员会指令2005/18/EC，2005年3月2日）。同时，决定设立针对东方栗瘤蚜（Dryocosmus kuriphilus）的监测计划，该虫被视为潜在的植物健康风险（欧盟委员会决定2006/464/EC）。这些对欧盟植物卫生指令的修订将影响Castanea sativa（甜栗）的木材和树皮在欧盟成员国间的流通，除非它们已被授予保护区（PZ）地位。这是对C. parasitica在大陆欧洲逐渐扩散以及对欧盟改变此病地位的施压的回应。该指令将英国（包括海峡群岛，但不包括马恩岛）认定为保护区之一。因此，从2005年5月15日起，欧盟内的植物护照控制将仅限于种植植物；植物护照控制将适用于木材（除非去除了树皮）和孤立树皮进入及在保护区内移动。为了维持我们的保护区地位，并对Castanea sativa的木材和树皮流通进行控制，我们有义务进行年度调查，以证明持续的无病状态。所调查的树木均未表现出栗疫病或栗瘤蚜的症状。

调查次数 - 在网格方格内调查的地点数量

年份 - 调查地点的年份。归属声明：包含OS数据©英国皇室版权[和数据库权利][年份]。