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cies of moths in the Karelian region. The author considers Orgyia antiqua (L.) and Epirrita autum- nata (Bork.) to be potential pests. Gninenko (1999) ranks Ptilodon capucina (L.), Biston betularius (L.), Ochropacha duplaris (L.), Hypomecis punctinalis (Scop.), Leucodonta bicoloria (Den. et Schiff.) and Acronicta leporina (L.) among pests endangering birch. Flerov (1954) considers Operophtera bruma- ta (L.) Erannis defoliaria (Cl.) and Biston stratarius (Hufn.) to be an important component of the crown fauna of birch. In Scandinavia in regions beyond the Arctic Circle, E. autumnata (Bork.) undergoes periodical gradations on Betula tortuosa Ledeb. causing complete defoliations ( Eidmann 1964). Cihař (1978) rank loopers B. betularius (L.) and Geometra papilionaria (L.) among important pests of birch. Erannis defoliaria (Cl.), larvae of which are less numerous but exhibit higher food requirements than winter moth causes often complete defoliation in case of gradation. The fact is supported by damage ABSTRACT: The species spectrum of Geometridae, their seasonal and population dynamics and importance for the stability of birch stands in the air-polluted area of the Krusne hory Mts. was derived from a light trap (224 species of imagoes, particularly Cabera pusaria (L.), and Cyclophora albipunctata (Hufn.)) and the method of shaking off from birch crowns (52 species of larvae, particularly C. pusaria (L.), Operophtera fagata (Scharp.) , Alcis repandata (L.), Bis- ton betularius (L.), and C. albipunctata (Hufn.)). O. fagata (Scharp.) has an economic importance for birch stands and newly established beech stands. Thanks to the uneven time of hatching moths of an eudominant species C. pusaria (L.) the danger of defoliation of birch stands in summer is reduced in spite of the species gradation potential.

Geometridae (Insecta: Lepidoptera) in stands of substitute species with the dominant position of birch