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Northern Watermilfoil (Myriophyllum exalbescens) can be found in every state. Northern Watermilfoil can occur in dense patches crowding out all other growth. If the basic corrective actions are taken you should anticipate excellent control. Identify the plant, measure the control area, choose the product and dose and apply timely. It is always a good idea to keep records to assist in future control adjustments.
Note: See also Eurasian Watermilfoil (EWM) an exotic submerged that looks similar. EWM can have as many as twenty leaflet pairings. Northern Watermilfoil leaflet pairings will not exceed ten.
Hydrothol 191 Granular is a favorite, it is easy to apply and very broad spectrum. An alternative is Reward liquid herbicide equally effective and broad spectrum. Most people prefer the granular Hydrothol because of its easy to apply granular formulation.
Northern Watermilfoil plant fragments can regenerate. If you are going to physically cut or rake this plant for control we suggest limiting the control size and try to recover fragments.
Early in the growth cycle is usually best. Water temperatures should exceed sixty degrees Fahrenheit.
One to two treatments per season are usually plenty.
Generally within two weeks things will be cleared up.