It tends to nest in conifers, such as the Scots pine and the Norway Spruce. DuPont acknowledged it was killing or damaging evergreen trees, including white pine and Norway spruce. Commonly made of Norway spruce, they are called "tavaillon". Today, however, the commercially managed areas are mainly monocultures of Norway spruce. More than half of the forests consist of Scots pine or Norway spruce. An important tree species is Norway Spruce. A row of fifty Norway spruce trees lines the main driveway leading to the farm. Norway Spruce is the most important tree species. As with Siberian spruce, it hybridises extensively with Norway spruce; pure specimens are rare. Though it specializes on Norway spruce, it is not found throughout the tree's range. Norway spruce and Sitka spruce are the most common varieties planted. There are many Norway Spruce forestations, often in monoculture because of their valuable timber. Conifers include some Weymouth pine from 1781, Norway spruce, Douglas fir and larch. The tallest measured Norway spruce is tall and grows near Ribnica na Pohorju, Slovenia. The Norway spruce is used in forestry for (softwood) timber, and paper production.