Stock Photo - 13 March 2019, Hessen, Lich: Jonas Haber, a student in his practical training, is investigating the effects of soot bark disease on the bark of one of the approximately 30,000 diseased maple trees, most of which have already been felled and are now piled up along the forest path. They are infested by a fungus that can cause the trees to die. Photo: Frank Rumpenhorst/dpa. - Lich/Hessen/Germany

Stock Photo: 13 March 2019, Hessen, Lich: Jonas Haber, a student in his practical training, is investigating the effects of soot bark disease on the bark of one of the.

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