breann hohman, watershed & stewardship coordinator · found in calm water ... leaves are...
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Breann Hohman, Watershed & Stewardship Coordinator
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What is European frogbit? Hydrocharis morsus-ranae
Perennial
Free floating – forms dense mats
Found in calm water Favors calcium rich
Meso to eutrophic conditions
Diecous (although usually one sex)
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Identification
Single white flower with 3 round petals and a yellow center
Free floating
Leaves are kidney-shaped to heart-shaped with a purple-red underside
Leaves form a rosette
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Look alikes
Water-shield
Water lily
American frogbit
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Reproduction Flowers/berry
July-August
Average 24-46 seeds
Stolons
Turions
Each forms 10 clones
Can spread a square meter/season
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History 1930’s
Ottawa, Ontario CA
1974 New York, USA
1996 Michigan, USA
Today Lower Great Lakes
New England Sates
Washington State
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How it spreads Water
Waves and currents
Avian
Waterfowl and wading shorebirds
People
Boats
Water gardening
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Control Methods Mechanical Removal
Hand-pulling
Shading Must be greater than 70%
Herbicides Endothall, diquat, triclopyr, Roundup? Imazapyr?
Biological Grass carp?
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Old Woman Creek
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2017 Removal Attempt 12 volunteers (3 staff)
4 hours
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What we learned
Start early in the year
Carefully map & prioritize
Buckets are almost useless
Set up a relay system
Plan more than one event
Know when to stop
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Old Woman Creek & beyond
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Planning a successful event Pick out a compost site BEFORE the event Volunteers needed
Pullers Transporters Loaders
Equipment needed Kayaks, canoes, & jon boats Truck & trailer Waders & buckets Pitch forks & rakes
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Prevention, Early Detection & Rapid Response!!
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Questions?