Invasives
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Why We Should Care about Invasives
Economics In the United States, expenses associated with ecological damage and control of invasive species were estimated at $137 billion per year in 2001 and have been increasing ever since.1 More recent global studies have found that invasive…
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Invasive species rule – NR 40
Wisconsin’s invasive species rule, Wis. Admin. Code NR 40 [PDF exit DNR], makes it illegal to possess, transport, transfer or introduce certain invasive species in Wisconsin without a permit. Everyone is responsible for complying with these…
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Understanding invasive species
Wisconsin Statute Section 23.22 (1) (c) defines invasive species as "nonindigenous species whose introduction causes or is likely to cause economic or environmental harm or harm to human health." Humans move organisms around all the time.…
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Invasive Species Rule – NR 40 terminology
ProhibitedInvasive species that are not currently found in Wisconsin, with the exception of small pioneer stands of terrestrial plants and aquatic species that are isolated to a specific watershed in the state or the Great Lakes, but which, if…
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Report invasive species
We are working to keep invasive species out of Wisconsin. Early reports of new populations allow us to respond rapidly and control invasives before they spread into new areas. Select from the tabs below to report invasive species you have found.
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Partners
Please choose a category from the menu below for a listing of related organizations. Please note all links exit the DNR website. Links to publications and other educational resources can be found on our education and publications webpage.
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Purple loosestrife biocontrol — and you
Purple loosestrife (Lythrum salicaria) is a flowering plant that can reach 3’-7’ tall and is listed as a Restricted Invasive Species in Wisconsin because of its history of causing negative ecological impacts to wetlands and shorelines. Extensive…