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根据1985年7～9月在联邦德国全国范围内进行的森林损失清查,52%的林地都被列为遭受损失或感染病害,此次调查主要是与区域性的“标准”状态相比较而言。就叶量损失的程度来说,感病的林分比正常的林分叶量少。划为健康和未受影响的森林(0类)至少具有正常叶量的90%,损害较小的林分(工类)的叶量损失为11～25%,中度损害(2类)为26～38%,损害严重的林分(3类)为39%。
According to the inventory of forest losses conducted in the Federal Republic of Germany from July to September 1985, 52% of the forest land was classified as suffering losses or diseases, and the survey was mainly conducted in comparison with the regional “standard” status In terms of. In terms of the extent of leaf loss, susceptible stands have fewer leaves than normal stands. Forests classified as healthy and unaffected (category 0) had at least 90% of normal leaf mass and 11-25% loss of leaf mass for less damaged stands (class), and moderate damage (class 2) 26-38%, and 39% of the severely damaged stands (3 categories).