Gremmeniella abietina in Finnish Pinus sylvestris stands in 1986-1992: a study based on the national forest inventory

damage drainage drenaje enfermedades fungosas finland finlande finlandia forest inventories forest land forest stands fungal diseases godronia inventaire forestier inventarios forestales maladie fongique peuplement forestier pinus sylvestris rodales silvicultural systems sistemas silviculturales stand characteristics terrain forestier tierras forestales