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Plant Identification -- Submerged Weeds -- Large-Leaf Pondweed |
LARGE-LEAF PONDWEED (Potamogeton amplifolius)
Treatment Tips: These two species are notorious for their resistance to chemical control. Often growing in patches or beds, the tough stems and leaves remain standing and intact even after death of the plant, especially in hard waters.
Description: Large, thick stem with wavy, re-curved, oblong, submersed leaves which taper to the stem. Floating leaves are ovate*. Solid, tightly packed spike of nutlets at tip of the plant. Plant is seldom branched.
Distribution: Common in hard water throughout the northern half of U.S. Plants often appear brown due to mineral deposits on leaves.
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Recommended Control Method: Tank mix 1 part Cutrine-Plus to 2parts Aquathol K. Apply at the rate of 2 gallons per acre-foot of water. Dilute to facilitate even distribution.
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Maintenance Control Method: Add Aquashade at the rate of 1 quart per acre-foot of water to prevent initial growth or to retard regrowth of plants after chemical treatment.
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Alternate Control Methods: Aquathol Granular: 54 to 108 pounds per acre-foot.
Aquathol K liquid: 1.3 to 2.6 gallons per acre-foot.
Reward: 2 gallons per surface acre (conditional control).
Fluridone : Various liquid or pelletized formulations (see label).
*Ovate: shaped like an egg with the broader end downward.
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Descriptions and pictures are from the book "How to Identify and Control Water Weeds and Algae", Edited by James C. Schmidt, 5th edition revised 1998, copyright 1976 Applied Biochemists. |
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