The research was performed on parallel (damaged and non-damaged by insects) plots in a spruce ecosystem situated in the upper part of the Bielovodská dolina valley (High Tatra Mts). The studied geobiocoenoses belongs to the hemioligotrophic interorder and group of types of geobiocoens Sorbi aucupariae-Piceeta. The soils (cambisolic podsols with humus form typical moder), formed from the granodioritic moraine, have medium depth, poor or medium content of skeleton and quite favourable physical properties. The biometric analysis revealed, that the lenght and weight of the populations of observed herb taxa reached in the year 2001 following values control plot [span (average), average] - fertile shoots of Luzula sylvatica 28-42 (35.11) cm, 0.304 g; sterile shoots of Luzula sylvatica 7-17 (12.65) cm, 0.219 g, Calamagrostis villosa 17-32 (24.23) cm, 0.058 g, Veratrum album 18-30 (24.0) cm, 0.988 g, Homogyne alpina 3-9 (5.97) cm, 0.047 g; calamitous plot [span (average), average difference in comparison with control plot] - fertile shoots of Luzula sylvatica 37-52 (44.58) cm, + 27%, 0.429 g, + 41%; sterile shoots of Luzula sylvatica 8-24 (18.0) cm, + 42%, 0.359 g, + 64%, Catamagrostis villosa 22-48 (35.43) cm, + 46%, 0.103 g, + 78%, Veratrum album 21-23 (22) cm, -9%, 2.098 g, + 112%, Homogyne alpina 3-10 (5.83) cm, -2%, 0.047 g, + 0%. The evaluation of mean shoot lenght of herb species among the monitoring plots processed by the analysis of variance shows significant differences among Luzula sylvatica and Calamagrostis villosa.