This post present the results of the field research on the rivers Nitra and Handlovka, during the growing season 2015. Overall there has been identified 18 invasive species. Our results show dominant presence of the taxon Helianthus tuberosus (40.5 %) followed by the Fallopia × bohemica (11.0 %). The most frequency interval on this corridors was up to 5 m, and and from 5 to 10 m. Invasive species covered area of 2839 m2 and created 238 populations. The most common species, found near the invasive populations were Achillea millefolium, Calamagrostis epigejos, Rubus caesius and Urtica dioica.