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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
Diquat (1-1.5 lb/a;
When actively growing.
Waterhyacinth and water-
Apply as a surface spray in 150 to 200 gal water, or as an
aerial spray in 7.5 gal water per acre. Do not contaminate
$34.00/lb)
lettuce.
irrigation or domestic water, or water used for livestock.
When actively growing. E m e r g e d a n d f l o a t i n g
Add 1 to 2 quarts of Ortho X-77 surfactant per 100
Glyphosate (1-3 lb/a;
broadleaf weeds and
gallons spray solution. Avoid washoff by boat backwash
$26.30/lb)
or rainfall within 6 hours of application. Consult local
grasses.
state fish and game agency and water control authority
before applying to public water.
EMERSED AND MARGINAL: ROOTED UNDERWEAR, TOPS ABOVE WATER (BROADLEAF WEEDS)
Biological control with alli-
Anytime, but best results if Alligatorweed, floating or
See text.
gatorweed fleabeetle and
released early in growing rooted emersed.
alligatorweed stemborer.
season.
Dichlobenil (4-8 lb/a; gran- At or just before emer- Lotus, spatterdock, white
Spread granules evenly over the water surface. Do not use
ules; $31.00/lb)
gence.
waterlily, and others.
treated water for irrigation, livestock, or domestic pur-
poses. Do not use fish for food or feed within 90 days
after treatment.
2,4-D, low-volatile ester When actively growing.
Arrowhead, lotus, pickerel-
Apply in oil or in oil-water emulsion (1:10 or 1:20) in
(2-4 lb/a; $2.60/lb)
weed, smartweed, spatter-
sufficient volume to give uniform coverage. Apply granu-
dock, spikerush, water-
lar formulation evenly over water surface with spreader.
primrose, white waterlily,
Do not exceed 0.1 p/m by weight tolerance for irrigation,
and other plants with waxy
domestic water, or stock watering.
leaves.
EMERSED AND MARGINAL: ROOTED UNDERWATER, TOPS ABOVE WATER (GRASS AND GRASSLIKE WEEDS)
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