Prevent the spread of aquatic invasive plants



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"News Release"



Sept. 25, 2025
Contact: Kevin Walters <[email protected]>, 616-250-8637 or Joanne Foreman <[email protected]> 517-284-5814

Hunters: Remember to 'Clean. Drain. Dry.' to protect waterfowl habitat

As waterfowl hunting season begins, the Michigan Invasive Species Program is asking hunters across the state to take extra precautions to prevent the spread of invasive species.

Problem species

Four duck hunters in a boat behind a stand of invasive phragmites. A dog is on a raft in the foreground.

Hydrilla [ [link removed] ], considered one of the world's most invasive aquatic plants, was found in private ponds in southwest Michigan in fall 2023. The Department of Environment, Great Lakes, and Energy is working with landowners to eradicate the infestation. In 2024, a hydrilla detection in Ontario, Canada [ [link removed] ] forced the closure of a portion of the Hillman Marsh Conservation Area popular with waterfowl hunters.

Glyceria maxima [ [link removed] ] (also known as rough mannagrass), an invasive plant similar to phragmites, has been found in the Dollarville Flooding in Newberry. The Department of Natural Resources is working with the Three Shores Cooperative Invasive Species Management Area to manage the infestation.

In addition to these new invasive plants, concern remains about the spread of European frog-bit [ [link removed] ] and invasive phragmites [ [link removed] ]. All four species tend to grow in slow-moving waters – just the kind of places that ducks and geese flock to.



Why be concerned?

A mass of invasive hydrilla, an aquatic plant, held just above the water's surface.

Invasive phragmites and Glyceria maxima are tall, reed-like grasses that outcompete native species along shorelines and in shallow waters and block access for humans and wildlife.

Both European frog-bit and hydrilla create thick mats of vegetation that can hamper the movement of diving ducks and reduce the availability of snails, mollusks and other food sources.

Plants can get caught in boat motors and gear, making it harder to navigate prime hunting areas.

Infestations can spread to new bodies of water when plant fragments, rhizomes (root structures) or small, seed-like turions attach to boats, trailers, gear and even dogs.



Take action!

To protect Michigan’s waterfowl habitat, hunters are asked to take the following precautions:

A hand holds a European frog-bit plant with round leaves and a white flower. A marsh is seen in the background.
* *CLEAN* equipment (including waders, decoys, straps, anchors, boats and trailers) thoroughly between trips to keep from transporting undesirable plant fragments, seeds or organisms from one site to another.
* *DRAIN* all water from boats, trailers and equipment.
* *DRY* boats, gear and equipment for five days (if possible) before transporting to another body of water.
* Inspect all gear and equipment before and after use, including anchors, decoys and lines, blinds, waders and clothing. Remove any plants, debris or soils.


Remember that Michigan boating laws [ [link removed] ] require boaters to pull plugs, drain water and remove plants and debris from boats and trailers before getting on the road.

Hunters are encouraged to use synthetic materials to camouflage boats and blinds or choose known native species like cedar to avoid accidental selection of invasive plants.

A helpful video, Invasive species: Phragmites and waterfowl hunters [ [link removed] ], and more information about invasive species can be found at Michigan.gov/Invasives [ [link removed] ].

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"Michigan's Invasive Species Program is cooperatively implemented by the Michigan departments of Agriculture and Rural Development; Environment, Great Lakes, and Energy; and Natural Resources."

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*Note to editors:* Accompanying photos are available below for download. Caption information follows. 


* Hunt [ [link removed] ]: Duck hunters position their blind behind a stand of invasive phragmites at Pointe Mouillee State Game Area.
* Hydrilla plants [ [link removed] ]: Invasive hydrilla is considered one of the world’s most invasive aquatic plants. "Photo courtesy of Leslie J. Mehrhoff, University of Connecticut, Bugwood.org."
* EFB [ [link removed] ]: Invasive European frog-bit, resembling small water lilies, is often found in slow-moving water among cattails.
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