Topoclimatic limitations to the outbreaks of Epirrita (=Oporinia) autumnata (Bkh. ) (Lep: Geom) near the forest limit of the mountain birch in Fennoscandia.

Topoclimatic limitations to the outbreaks of Epirrita (=Oporinia) autumnata (Bkh. ) (Lep: Geom) near the forest limit of the mountain birch in Fennoscandia.