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 HERBICIDES FOR USE IN PONDS, LAKES, AND RESERVOIRS -- Continued
Treatment
(Application rate;
cost per pound)
Time of Application
Weeds Controlled
Remarks
SUBMERSED: ROOTED OR ANCHORED WEEDS
Copper-ethyl-enediamine
Before weeds reach water Hydrilla
Inject below the surface as solution or as an invert
complex (6.5-13 lb/a)
surface.
emulsion. Trout and other fish may be killed at rates
recommended for control of hydrilla. Do not exceed
tolerance of 1 p/m by weight copper in potable water.
Dichlobenil (7-10 lb/a;
At or just before weeds Coontail, elodea, naiad,
Apply temporarily exposed bottoms. May be used for spot
$31.00)
emerge.
pondweeds, watermilfoil,
or partial treatments. Use lower rates for shoreline or
and others.
exposed bottoms. Do not use in irrigation water, or in
livestock or domestic water. Do not use fish for 90 days
after treatment.
Dichlobenil (10-15 lb/a;
At or just before weeds Coontail, elodea, naiad,
Broadcast evenly over water surface. Take the same
$31.00/lb)
emerge.
precautions as in dichlobenil above.
pondweeds, watermilfoil,
and others.
Diquat (2-4 lb/a, 0.25-2.5
Before weed growth be-
Bladderwort, coontail, elo-
Apply to surface or inject subsurface. Use higher rates for
p/m by weight;
comes dense or reaches
mixed weed species, and for elodea, coontail and
dea, naiad, watermilfoil,
$34.00/lb)
water surface.
widgeongrass. Do not use in muddy water. Do not use
hydrilla, and others.
treated water for human or animal consumption, swim-
ming, or irrigation within 10 days after treatment or until
an approved assay shows diquat in water to be below
tolerance concentration, 0.1 p/m.
Endothall (dimethylalkyla-
Before weed growth be-
Bladderwort, coontail, elo-
Use only for spot treatments or where some fish kill is not
mine salts) (0.5-2.5 p/m
comes dense or reaches
dea, naiads, pondweeds,
objectionable. Do not use treated water for livestock or
by weight; $10.40/lb)
water surface.
watermilfoil, wild celery,
domestic purposes within 14 days after treatment. Do not
and Zannichellia.
use fish for food or feed within 3 days after treatment.
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