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.
640 pixels wide: (k9651-7.jpg)
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