Szukana fraza: [Abstract = During the last years an alarming dieback has occurred in 20 to 40 years old first\-rotation pine stands \(Pinus sylvestris L.\) on mine sites, caused by the white rot fungus Heterobasidion annosum \(Fr.\) Bref. First thinning opens the infection path so that up to now 30 to 89 % of afforestations in different mining areas are affected.]

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