Pine weevil is the main threat to planted seedlings in southern and central Sweden. The foresters try to protect the seedlings with the aid of mechanical or chemical barriers, or simply by planting them in well-performed scarification.
There are indications that the resistance to pine weevil has a genetic variation. A TC4F-financed cooperation with SLU in Uppsala and Skogforsk is now examining this variation. An experiment with 10 000 spruce seedlings from 50 mother trees have been planted in Uppland, central Sweden. When any differences are identified in the field, researchers at UPSC will search for genetic markers for the resistance.