Managing
Curlyleaf Pondweed
using Aquathol®
and Hydrothol® Aquatic Herbicides and Algicides
What about
swimming after an application?
There is no
swimming restriction on any of the Endothall
labels.
These products dissipate rapidly after use. They are poorly absorbed
through
the skin and small amounts of water that are ingested while swimming
are not
considered toxic or harmful. An adult would have to continuously swim
more than
500 hours (20 days) to absorb and ingest more than enough Endothall
to exceed the No Observable Effect Level (NOEL*). That's enough time to
swim 10
laps across
Can I eat the
fish from the treated lake?
Eating fish
following an Endothall treatment is not
prohibited. Endothall does not concentrate
in fish. A person would have
to eat over 600 lbs. of fish from water treated with Aquathol
or Hydrothol every day for a lifetime to
exceed the
NOEL.
What about
livestock that drink treated water?
Like fish, Endothall
is not concentrated in the meat and is excreted
rapidly. Beef cattle drinking from a pond treated with Aquathol
or Hydrothol would ingest a small quantity
of Endothall. A person would have to eat
almost 1300 lbs. of
meat from animals drinking only treated water to exceed the NOEL.
What if my
dog or cat drinks the treated water?
This is
considered incidental exposure. In addition Endothall
is not toxic to dogs or cats at rates used to treat aquatic weeds and
algae.
Is Endothall toxic
to waterfowl or other wildlife?
Endothall formulations for aquatic uses are not toxic to
waterfowl
and wildlife when applied at labeled rates. (The maximum rate of
application is
5 ppm for any of the Endothall
products: the 8-day LC50 for bobwhite quail and mallard ducklings is
>5,000 ppm and the 21-day LD50 for
mallard ducks is 344 ppm.)
How long does
Endothal last in the water following a
treatment?
The time that Endothall remains in the water
varies with the size and type of application made, but it
generally
dissipates and degrades within a few days. The half-life (time in which
1/2 of
the product is degraded) is about 3-7 days in most situations. Endothall is degraded by microbes into Carbon,
Hydrogen,
Oxygen and Organic Acids normally found in the environment.
What about
drinking treated water?
The U.S. EPA
has established a Maximum Contaminant Level (MCL) for drinking water of
0.1 ppm. An adult would have to drink more
than 350 gallons of
water ever day at the MCL of 0.1 ppm for a
lifetime
to exceed the NOEL.
Aquatic
plants play an important role in the ecology of our lakes and
reservoirs.
However, exotic invasive aquatic weeds such as Hydrilla,
Eurasian Watermilfoil, Curlyleaf Pondweed
and Water
Hyacinth, along with noxious algae, often pose a serious threat to the
health
and well-being of these water resources. Endothall,
the active ingredient in Aquathol and Hydrothol can enhance the aquatic environment
and protect
our waters by controlling these weeds and algae.
The above
statements are based on exposure or consumption of endothall
by an adult at the EPA established and proposed tolerances or levels
predicted
from animal studies. To protect yourself and the environment when using
pesticides, carefully read and follow label directions.
'The NOEL is
the highest dose at which no adverse effects were observed in
laboratory
animals. For regulatory purposes, the NOEL is selected from the
laboratory
mammalian species that shows the greatest senstivity
to the effects of the pesticide.
Aquatol is a registered trademark of United Phosphorus,
Inc.
© 2007
United
Phosphorus, Inc.
All rights
reserved.
1-800-438-6071
• www.upi-usa.com
UPDATED September 26, 2008
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