Asked Questions of Aquatic Weed Control
long before I see results?
A: Algae impact can
be seen same day and usually will succumb within five days.
Weeds on average will drop from the water column and decompose
on average from eight to fifteen days after treatment -
some sooner - some a bit longer. Nuisance type, time of
year, product used, all impact control horizons.
is the best time to treat?
A: Anytime during the
seasonal growth period is appropriate. If weed and algae growth
are a problem, you can successfully treat. Do not treat before
Q: Do we have to treat each year?
A: Typically, treatment is an annual event, often requiring
two applications for season long control. Some waterbodies
will yield different plant types growing at different times.
Systemic herbicides can achieve longer term control.
Q: Do I
need to wear personal protective equipment?
A: See the label for
exact requirements. Generally, long pants ,long sleeves, footwear,
gloves and eye wear are specified. The LABEL covers all usage
Q: Are the
products safe for people, fish, wildlife and pets?
A: All products on this site are EPA registered for use
in the aquatic environment. The products used are effective
on plants and algae at very low concentration levels allowing
for a large margin of safe use when used according to label
There are no label restrictions for swimming with these
* Weedtrine-D: 1 day swimming restriction
Only a couple of products have fishing restrictions, generally
Pets and Wildlife
See individual label for any restrictions.
There are no water use restrictions for domestic pets or
wildlife e.g. ducks, geese, birds or the family dog.
to the product "LABEL" for exact use information and directions
and for any new changes.
Q: Are regulatory
A: Many states require
a permit for herbicide/algaecide control of weeds and algae
in protected waters. Consult your State Fish and Game Agency.
Q: Do U.S. states have aquatic weed issues specific to each
A: Rarely are aquatic weeds confined by state or regional
borders. However, we find that certain issues are more common
in some states than others. Please visit our state weed control
pages for issues common in that state: