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In the wild, duckweed is an important source of food for fish
and waterfowl. Duckweed provides a habitat for certain types of
frogs and fish. It also maintains the habitat by providing enough
shade to keep the growth of oxygen-robbing algae down.
Duckweed multiplies rapidly. It may spread from pond to pond on
the feathers of waterfowl. When duckweed completely covers a pond,
it will block light from reaching other plants that live within the
pond which in some cases leads to fish kills.
Duckweed may be a symptom of other pond problems such as high
nutrient levels. Duckweed thrives in nitrogen-rich
Common duckweed is a very small light green free-floating, seed
bearing plant. Duckweed has 1 to 3 leaves, or fronds, of 1/16 to
1/8 inch in length. A single root (or root-hair) protrudes from
Giant or big duckweed is still
relatively small (1/16 to 1/4 inch) with 1 to 4 leaves, or fronds,
light green in color. Three or more roots (or root-hairs) protrude
from each frond.
Duckweeds tend to grow in dense
colonies in quiet water, undisturbed by wave action. Often more
than one species of duckweed will be associated together in these
colonies. All duckweed species can be aggressive invaders of ponds
and are often found mixed in with other duckweeds, mosquito fern,
From a distance, duckweed is often
mistaken for algae; it may form a thick, green blanket on the water
surface. Duckweed is not interconnected, as is filamentous
A. Full pond
treatment is needed for effective control.
A. Once water
temperatures are around sixty degrees or warmer.
A. Many factors
determine regrowth when it comes to duckweed and without knowing
your site it is difficult to say. Generally speaking, multiple
treatments (2 or more) may be needed.
A. It really
depends on the product you choose. For most vegetation, control
will take approximately 2 weeks however, tissue damage may be
evident within 2 to 4 days with liquid formulations. Some
products are slower acting with results taking 30 days or more to
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