Brazilian Elodea Egeria densa Darren R. ThornhillFisheries Management Biologist MO Dept. of Conservation 3500 S Baltimore St. Kirksville, MO 63501
What does it look like?• Submerged, perennial plant• Stems (up to 2 m) branch at water level• Whorls of 4-8 spear-shaped leaves (1.2-3.8 cm)• Three white flowers (18-25 mm) at or just above water surface
Ecology• All known plants in the US are male – Spreads through fragmentation• Found in still and moving water• Found in depths ranging up to 7 meters – Also found in free-floating mats• Develops dense, monotypic stands
How did it get here?• Native of Brazil and coastal Argentina and Uruguay• First collected in Long Island, NY in 1893 – First sold in US in 1915 as good “oxegenator”• Commonly cultivated and sold for the aquarium trade – Anacharis
How do we get rid of it?• Prevention is paramount!• Biological control with grass carp• Mechanical control is not recommended• Chemical control is effective – Complexed copper and diquat (effective) – Complezed copper and Endothall (marginally effective) – Fluridone (effective)
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