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A small, free-floating plant with one root per frond. Thick mats of duckweed are found in ponds and slow-moving waters. The small flattened plants float on the water surface and tend to grow in dense colonies; forming floating carpets . Common duckweed is often interspersed with other varieties of duckweeds and Azolla.
Small fish at very high stocking rates (see filamentous algae above) may give control; larger fish at normal stocking rates usually are not effective.
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Found in clear waters, with most profuse growth in ditches and swamps that are free from currents. Dense populations can clog irrigation pumps and sprinklers.
Rounded or oval, and flat. Leaves are 1/10th to 1/8th in. wide.
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