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Image:Giant salvinia thumbnail.jpg
Giant salvinia thumbnail from http://www.ars.usda.gov/is/graphics/photos/
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Image Number K9651-7
Giant salvinia is a fast-growing fern that can clog ponds and lakes. Forming mats up to 2 feet thick, the plant gobbles up oxygen and blocks sunlight needed by other water dwellers. A tiny weevil, Cyrtobagous salviniae, is under study as a biocontrol for this obnoxious invader. Photo by Scott Bauer.
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