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Weed Killer Instructions
For optimum effectiveness apply
early in the day under calm, sunny conditions when water temperatures
are at least 60 degrees. This will ensure that the hydrilla
weed killer does not drift away or wash away quickly.
Treat when growth first begins to appear or create a nuisance, if
possible. The sooner the better as it is esier to kill
hydrilla verticillata when
young.
Apply the weed killer in a manner that will ensure even distribution of
the chemical
within the treatment area. Spray back and forth
Re-treat areas if re-growth begins to appear and seasonal
hydrilla weed control
is desired. Allow one to two weeks between consecutive
treatments. You can target small areas if necessary.
Allow seven to ten days to observe the effects of weed control
treatment (bleaching
and breaking apart of plant material). You will notice the dead
hydrilla on the shoreline. That is great news.
You can use your basic sprayer  purchased from any hardware store. They
are also sold at Wal-Marts and K-Marts
There are a number of considerations to take into effect when applying.
Waterfront Property
Small Pond
River or Moving water
Waterfront Property
Calculate the number of cubic feet of water to treat.
Multiply # of feet of shoreline X Distance from Shore to
treat X Average Depth. That will give you total cubic
feet to treat.
Example: A house has 100 feet of shoreline, with hydrilla from
shore to 25 feet out. The water depth is a gradual slope from
shore to 10 feet deep.
100
X
25
X
5
= 12,500
cubic
foot
(feet of shoreline) (Distance
from shore to treat)
(Average Depth)
(total cubic feet)
Early Season/Low Density - 1 gallon will treat 36,300 cubic feet.
Mid Season/Moderate Density - 1 gallon will treat 20,743 cubic
feet.
Late Season/High Density - 16,133 cubic feet.
Before applying, dilute the required amount with enough water to ensure
even distribution with the type of equipment being used. For most
effective results, apply under calm and sunny conditions when water
temperature is
at least 60 degrees. Break up floating algae mats before spraying
or
while application is being made. Use hand or power sprayer
adjusted
to rain sized droplets. Spray shoreline areas first to avoid
trapping
fish.
Under conditions of heavy infestation, treat only 1/3 to 1/2 of the
water body at a time to avoid fish suffocation caused by oxygen
depletion from decaying algae.
Small Pond
It is not easy to calculate cubic foot in a small lake. If you
know the number of acres. There are 43,650 square feet in an
acre. If not, you will have to figure out a system to graph the
lake.
Early Season/Low Density - 1 gallon will treat 36,300 cubic feet.
Mid Season/Moderate Density - 1 gallon will treat 20,743 cubic
feet.
Late Season/High Density - 16,133 cubic feet.
Before applying, dilute the required amount with enough water to ensure
even distribution with the type of equipment being used. For most
effective results, apply under calm and sunny conditions when water
temperature
is at least 60 degrees. Break up floating algae mats before
spraying
or while application is being made. Use hand or power sprayer
adjusted
to rain sized droplets. Spray shoreline areas first to avoid
trapping
fish.
Under conditions of heavy infestation, treat only 1/3 to 1/2 of the
water body at a time to avoid fish suffocation caused by oxygen
depletion from
decaying algae.
River
Drip System Application. For use in potable water and irrigation
conveyance systems. Hydrilla Killer should be applied as soon as
algae or hydrilla begins to interfere noticeably with normal delivery
of water. (clogging of lateral headgates, suction screens, weed
screens and siphon tubes). Delaying treatment could perpetuate
the problem causing massing and compacting of plants.
Heavy infestations and low flow conditions increasing water flow
rate
during application may be necessary.
Prior to treatment it is important to accurately determine water flow
rates. In the absence of weirs, orivaces, or similar devices
which give accurate water flow measurements, volume of flow may be
estimated by the following formula:
Average width (feet) x Average Depth (feet) x Velocity*
(feet/second) x .09 = cubic feet per second.
*Velocity is the time it takes a floating object to travel a given
distance. Dividing the distance traveled in feet by the time
(seconds) This measurement should be repeated at least three
times at the intended application
site and then averaged.
Lets say our stream is 20 feet wide average depth is 5 feet and an
object travels 20 feet in 45 seconds. Our velocity would be
20/45 = .44
Average width (feet) x Average Depth (feet) x Velocity*
(feet/second) x .09 = cubic feet per second.
20
X
5
.44
X .09 =
3.96 cubic feet per second.
After accurately determining the water flow rate in cubic feet per
second. (C.F.S.) find the corresponding drip rate.
CFS
Quarts per hour
1
1
2
2
3
3
4
4
5
5
Calculate the quantity needed to maintain the drip rate for a period of
3 hours by multiplying Quarts/Hour x 3 Introduction of the
chemical
should be made in the channel at weirs or other turbulence creating
structures
to promote the dispersion of chemicals. In our example we would
need
3 quarts.
Pour the required amount into a drum or tank equipped with a brass
needle valve and constructed to maintain a constant drip rate.
Use a stop watch
and appropriate measuring container to set the desired drip rate.
Readjust according if flow rate changes during the 3 hour
treatment period.
Weed Killer Safety Precautions
Statement of Practical Treatment First Aid
If in eyes: Call a physician. Hold eyelids open and flush
with a gentle stream of water for 15 minutes.
If on skin: Wash with plenty of soap and water. Get medical
attention.
If swallowed: Drink promptly a large quantity of milk, egg white,
gelatin solution, or, if these are not available, large quantities of
water. Avoid alcohol. Get medical attention. do not
induce vomiting or give anything by mouth to an unconscious person.
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