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Hydrilla (waterthyme) is a genus of aquatic plant, usually treated as containing just one species, Hydrilla verticillata, though some botanists divide it into several species. It is native to the cool and warm waters of the Old World in Asia, Africa and Australia, with a sparse, scattered distribution; in Australia from Northern Territory ...
Hydrilla verticillata collection on Lake Seminole, Florida. This insect has been shown to be effective in the destruction of hydrilla. The photosynthetic ability of the leaf is reduced with even a small amount of larva damage, and the feeding injury becomes susceptible to opportunistic fungal infection. [3] The buoyancy of the plant is reduced.
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It is usually fairly easy to distinguish from its relatives, like the Brazilian Egeria densa and Hydrilla verticillata. These all have leaves in whorls around the stem; however, Elodea usually has three leaves per whorl, whereas Egeria and Hydrilla usually have four or more. Egeria densa is also a larger, bushier plant, with longer leaves. [15]