Mosquito fern in large group close up on water

Control Azolla, Mosquito Fern

Many people ask how to get rid of mosquito fern. The following options can be considered for how to control mosquito fern.


Manual/Mechanical Control:

If you are considering how to remove mosquito fern, physically raking or seining this plant can be an effective method of control.


Herbicide Control:

There are multiple options for how to kill mosquito fern that offer great or some control.

  1. Spritflo (for ponds with no outflow) – liquid that is poured and spreads throughout the entire body of water, offers extended control.
  2. Semera or Flumigard + surfactant (for ponds or lakes) – granules that are dissolved and mixed or liquids that are mixed and diluted with water and sprayed over the plants (early morning is best), fast acting.
  3. Dibrox (for ponds or lakes) – liquid that is diluted with water and sprayed over the plants, fast acting. This will give some control.


When treating mosquito fern,

  • Spritflo can be used at the first signs of growth.
  • With other herbicides, treat when the plants are established and actively growing.
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