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Azolla

Description

Azolla is a small free-floating fern approximately 1 to 3/8 inches wide. Leaves of the mosquito fern overlap, giving a quilted look to the surface and hiding the stem. A single root protrudes from each stem. Azolla can vary in color from green to red and are generally found in quiet ponds protected from wind action. Azolla can be aggressive invaders in quiet ponds and are often found mixed in with duckweed or watermeal.


Other Names: Fairy moss, mosquito fern, water fern, duckweed fern, or Carolina fern

Mechanical Control

Azolla can be controlled by raking or skimming it off the pond's surface.

Chemical Control

Broad spectrum contact herbicides, such as Ultra PondWeed Defense®, will quickly kill Azolla. Because it does not stay in the water body, multiple treatments may be needed throughout the season.

Chemical Application Best Practices

Anytime you use chemicals treat weeds or algae, please keep in mind the following:

  • Treat your pond in sections. Treat only half the pond's surface at a time, if the weather is hot, only treat 1/4-1/3 of your pond. Wait 10-14 days between treatments.
  • Once the weeds have browned, use a rake to remove as much dead material as possible. This prevents an accumulation of dead plant material and muck.
  • Treat your pond with the proactive approach to pond management. Use PondClear™, MuckAway™ and Pond Dye to keep your pond looking great.

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