Capitol News

As waterfowl hunting season begins in Michigan, the state's Invasive Species Program is urging hunters to take steps to prevent the spread of invasive plants that threaten wetland habitats. The call for action comes after recent discoveries of aggressive aquatic species in both Michigan and neighboring Ontario.

Hydrilla, an aquatic plant known for its rapid growth and difficulty to control, was detected in private ponds in southwest Michigan during fall 2023. According to the Department of Environment, Great Lakes, and Energy, efforts are underway with local landowners to eradicate this infestation. A separate hydrilla detection in Ontario led authorities there to close part of the Hillman Marsh Conservation Area, a site frequented by waterfowl hunters.

Another invasive plant, Glyceria maxima or rough mannagrass, has been found at Dollarville Flooding near Newberry. The Department of Natural Resources is collaborating with the Three Shores Cooperative Invasive Species Management Area to address this issue.

Concerns also remain about European frog-bit and invasive phragmites—both species that thrive in slow-moving waters preferred by ducks and geese. These plants can outcompete native vegetation along shorelines and shallow waters, restricting access for people and wildlife alike. Dense mats formed by hydrilla and European frog-bit can hinder diving ducks’ movement and reduce food sources such as snails and mollusks. Additionally, these plants may become entangled in boat motors or gear.

Infestations often spread when fragments or seeds attach themselves to boats, trailers, hunting equipment or even dogs moving between different bodies of water.

To combat this risk, hunters are being asked to follow several precautions:

"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."

Michigan law requires boaters to remove plugs from vessels as well as drain water and clear away any attached plants or debris before traveling on public roads.

Hunters are also encouraged to use synthetic materials for camouflaging their boats or blinds—or select native species like cedar—to avoid unintentionally spreading invasive plants.

More information about managing invasive species is available at Michigan.gov/Invasives. The state’s Invasive Species Program is a joint effort among the departments of Agriculture and Rural Development; Environment, Great Lakes & Energy; and Natural Resources.