Duckweed is a free-floating plant that can easily cover an entire
pond. It appears as a single leaf or a cluster of
three leaves with very fine roots that hang down
from the underside. Imagine miniature one, two or
three leaf clover about the size of a pencil eraser; sometimes smaller
Q. What are the best control options?
A. Herbicide Application:
We strongly recommend two herbicide types for Duckweed
1) White Cap
4) Weedtrine-D (For decorative/ornamental ponds)
Q. Which herbicide when?
Sonar: This is a great control agent; we use it daily in our infield
service division. Sonar is broad spectrum, it controls most submerged
plants as well as Duckweed. Sonar does require a long contact period
of at least two weeks. For that reason it should not be used in ponds
with significant out flow unless you can sequester the water. A bit
of water exchange or an average rain event won’t hurt but if
there is constant out flow do not use Sonar. Use the liquid formulation
of Sonar for Duckweed control. Sonar can take three to six plus weeks
to achieve control but, Sonar offers a high level of control and the
longest term of control sometimes lasting a full season.
Remember: We are always available to help solve your aquatic problems.
Reward: Quick control action is one of its best attributes. Reward
is absorbed quickly by Duckweed and control is typically achieved within
two weeks. Attempt to contact as much duckweed as possible when applying
using a hand held or backpack sprayer. At higher label rates Reward
is also very effective against most submerged weeds. Control is typically
achieved within two weeks.
Q. When is the best time to treat?
A. Never treat before the Duckweed is present. If the Duckweed is
viable it will respond to treatment.
Q. How do I actually apply the product(s)?
A. Apply Sonar or Reward with a hand held or Solo
Backpack sprayers. Mix
Reward or Sonar with enough water to help facilitate distribution around
the pond. It is not important with Sonar to contact all the Duckweed
just get it in the water, its long contact time will take care of even
distribution. Contacting as much Duckweed as possible enhances reward
A Great Tip: Back pack sprayers cost more but they hold more product,
get the job done faster, spray farther and are much easier to use than
carrying a hand held sprayer that are awkwardly carried and require
frequent stooping, filling and pumping. Once you use a back pack sprayer
there is no going back – You can use it for all your yard weed
control and fertilizer applications or use it to apply Flight Control
Note: Always triple rinse spray tanks after each
use! Make sure rinsate is applied to the treatment
Q. How often do I need to treat Duckweed?
A. Many factors determine regrowth when it comes to Duckweed. On average,
treating one to three times within a season is common
depending upon product choice and environmental factors.
With our professional products and twenty-five plus years of experience
you achieve the results you desire.
recommended products from our online store:
- White Cap