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Pest Information

American Pondweed

American Pondweed

  • Latin Name: Potamogeton Nodosus
  • Common Name: American Pondweed
  • Other Names: Long-leaf pondweed, long-leaved pondweed

Pest Details

Origin:

Native to North America, and found throughout the United States including Hawaii, as well as throughout much of Canada.

Biology:

A perennial aquatic plant that reproduces from seeds, and spreads with rhizomes and fragments of stems. Roots and rhizomes are in the soil while the majority of the foliage floats at the surface, connected by the long, narrow stem. Potentially a problem in most waterways, such as ponds, lakes, streams, reservoirs, and irrigation ditches, usually in shallow waters under 6 feet in depth. In general the pondweeds are considered desirable plants with respect to their use as wildlife food and habitat.

Identification:

The visible parts of the plant are the leaves which float flattened on the water surface. These are about 2 inches in length and lance-shaped with pointed ends. The stem attaches to the bottom of the leaf at the end and the sides of the leaf are flattened. The flowering structure is a cone-like head that grows at the end of a long, thickened stalk that rises erect above the leaves. This structure is brownish and around 2 inches long.

Characteristicts Important to Control:

In most situations control is not needed, as the plants provide valuable habitat and food value for wildlife. If control is needed a systemic, aquatic-labeled herbicide may be effective. Consideration must be given to eliminating the rhizomes for complete control.

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