Wasserpest auf dem Baldeneysee in Essen. Selbst im Herbst sind die Reste der Massenausbreitung noch zu sehen. Die Wasserpflanze schränkt die Nutzung des Sees für den Wassersport stark ein. Bekämpfungsverfahren mit klassischen Mähbooten kosten rund 1 Million Euro pro Jahr und See. Deshalb hatten das Helmholtz-Zentrum für Umweltforschung (UFZ) in Leipzig und der Ruhrverband in Essen Anfang 2009 gemeinsam den Ideenwettbewerb "Erfindergeist contra Wasserpest" ausgeschrieben.
Foto: Tilo Arnhold/UFZ
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