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Eurasian Watermilfoil (Myriophyllum spicatum) is an exotic species most likely introduced in the United Sates by the aquarium industry. EWM grows densely and creates a canopy of vegetation that blocks out sunlight suppressing our native plants. EWM can grow to nuisance levels in lake areas previously devoid of such problematic growth compounding its impact.
Herbicide control of EWM is a slam-dunk – EWM is susceptible to a hand full of herbicides. Large-scale treatments must consider many factors, contact us directly when considering whole lake applications. Below are common scenarios that face the typical lakeshore or pond owner.
Which one when?
It is hard to recommend cutting or raking when it comes to EWM. The plant easily regrows by fragmentation facilitating its spread. Herbicides work great, reach places that cutters/rakes cannot and last much longer. If the lake already has EWM throughout then physical maintenance in conjunction with herbicide control is helpful.
Once water temperatures are around sixty degrees or warmer and the plants are viable. Unfortunately, EWM arrives sooner in the spring and stays longer than our native plants thus the control window is longer.
This varies with EWM depending upon adjacent influences and control products. On average, two applications per season. Your treatment site results will establish there own history and hence the future predictability. Keeping good records of your application will expedite any tailoring that need to be done. Remember, we are here help!
Generally within ten to sixteen days things will be cleared up.