Forestry research - Europe 2 forest - peat soils 2 forest insects - control 2 Bark - physiological aspects 1 Entomology- Forest 1 Entomology-Forest 1 Forest insects-Control 1 Forest insects-control 1 Forest trees - Beetles 1 Forest trees-Problem-Wood insects 1 Sylvan entomology 1 bark - physiological aspects 1 forest insect control 1 insects 1 timber entomology 1