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Plant Identification -- Submerged Weeds -- Eurasian Watermilfoil |
EURASIAN WATERMILFOIL (Myriophyllum spicatum)
Treatment Tips: 2,4 D has been the product of choice in controllingthis plant due to its selective nature of not harmingmost native plants.
Description: Leaves in whorls of 4 with 14 to 20 pairs of leaf divisions. Stalkof tiny, reddish flowers may extend above or on the water surface. Plant mayreach lengths of 10 ft. (3 m)or more. Plant stems and leaves may becomecalcified in hard water areas.
NOTE: This species is an exotic plant, introduced to the U.S. by the aquarium industry, and it is rapidly becoming a major nuisance throughout North America. It is capable of rapid dispersion, principally by fragmentation of plant parts. Each fragment is capable of growing roots and developing into a new plant. Removal of fragments from boat trailers and along shorelines is advised to prevent its spread into new areas. Eurasian Watermilfoil is quite competitive with native species and may completely dominate a plant community within a few years after introduction. Due to the plant’s ability to form dense growth, water use activities may become severely impaired. These plants are of little value to wildlife or fisheries.
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Recommended Control Method: Navigate evenly at the rate of 100 pounds per surface acre. Use for early season application on low-growing plants.
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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: 81 to 108 pounds per acre-foot.
Aquathol K liquid: 1.9 to 2.6 gallons per acre-foot.
Cutrine-Plus/Aquathol K: tank mix at the ratio of 1:3. Apply at the rate of 2 gallons per acre-foot.
Cutrine-Plus/Reward: tank mix at the ratio of 1:1. Apply at the rate of 1-2 gallons per surface acre.
Reward: 1 to 2 gallons per surface acre.
Fluridone (various liquid or pelletized formulations): 0.027 to 0.05 qt. per acre-foot (see label).
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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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