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A submersed, rooted, perennial aquatic plant with a very fast growth rate. The stems grow quickly to the surface of the water and spread laterally. Hydrilla is one of the most invasive plants infesting waterways in the Carolinas. There are two biotypes: monoecious and dioecious. The dioecious biotype is more robust.
Most rooted and free-floating submersed weeds in ponds are readily controlled with triploid grass carp; control may be poorer on the watermilfoils, particularly Eurasian waterfoil.
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An introduced noxious plant that has become established in freshwater areas throughout much of the southeastern U.S.
Oblong, sessile, and whorled in groups of 4 to 8 around the stem. Leaf margins are serrated, and color can range from light green to dark green and even reddish depending upon the environment.
Small, delicate, and inconspicuous. They appear fleetingly just at the surface of the water in late summer and early fall.
Hydrilla is similar in appearance to Egeria, but hydrilla has serrations along the leaf margin, forms underground tubers, and feels coarse to the touch. Egeria has very small serrations along the leaf, requiring a hand lens to see them, and feels soft and smooth when drawn through the hand.
Whether you're a professional botanist or a casual nature enthusiast, the NC State University (NCSU) Aquatic Weeds app has detailed information on a wide variety of aquatic weeds to assist in identification.
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