Result of extermination activities of invasive alien species, cutleaf coneflower Rudbeckia iaciniata around Lake Izunuma-Uchinuma in Miyagi Prefecture

Abstract

Extermination methods of the invasive and alien plant species, the cutleaf coneflower (Rudbeckia iaciniata), were studied in national wild land protection areas of Lake Izunuma-Uchinuma. We focused on two elimination methods (pull up and weeding), and combined both methods in the elimination activity from 2013 to 2015. As a result of the extermination project, the number of cutleaf coneflowers in the two communities decreased from 689 and 421 to 42 (6.1%) and 13 (3.1%), respectively. Also, the elimination effort decreased over the three years. These results suggest the possibility that the communities of cutleaf coneflower could be controlled by the elimination activity.