Invasive European Frogbit Invasive aquatic plant Prohibited in

Invasive European Frog-bit • Invasive aquatic plant • Prohibited in Michigan • Found in Ottawa and Oceana counties in 2019 • Lower Grand River • Pentwater Lake Updated: 4/10/2017

European frog-bit distribution in MI as of August 2019 Occurrences 1996 Wayne County 2014 Seven counties 2016 Kent County 2018 Oakland County 2019 Ottawa & Oceana counties - Locations in the Lower Grand River and Pentwater Lake

Identification • Free-floating – prefers slow moving waters • Develops dense mats

Early development Identification Flower turion plantlet • 3 white petals Leaves • 0. 5 – 2. 25” across • Round to Heart-shape • Leathery Stem • Horizontal runners • produce new plants

Identification Leaves • 0. 5 – 2. 25” across • Round to heart-shape • Leathery Plant • Free-floating • Rosette form • Develops dense mats Updated: 4/10/2017

Identification Native look-a-likes Duckweed • Leaves 1/16 – 1/8” • Free-floating White water lily • Pointed leaf lobes • Many-petalled white flower Spadderdock • Heart-shaped leaf with round lobes • Large leaves up to 16” • Yellow flower

Concern • Forms thick mats that can: • Get caught in boat motors. • Affect fish and waterfowl movement. • Decrease oxygen levels in water as plants decompose. Updated: 4/10/2017

What you can do • CLEAN: Remove all vegetation and debris from boats, trailers and gear before leaving a launch site. • DRAIN: Remove all plugs and drain water from bilges, ballast tanks and live wells. • DRY: Allow boats, trailers and gear to dry thoroughly before using them in a different water body. Updated: 4/10/2017

Report Updated: 4/10/2017 • If you see European frog-bit, take one or more photos, make note of the location, date and time of the observation, and report to: • EGLE-WRDANC@michigan. gov, or call 517 -284 -5593 • - or - use the Midwest Invasive Species Information Network http: //www. misin. msu. edu/

Additional information • www. Michigan. gov/Invasivespecies