Herbicide Recommendations for Water Weeds: Emergents

Excerpt from 2008 Chapter 19, Publication 75, Guide to Weed Control, Order this publication

Amitrol 240
Karmex
Reward
Integrated Weed Management for Water Weeds (Aquatic Plants)
Water Weeds (Aquatic Plants) Control Herbicide Rating Tables
- Habitats and Herbicide Susceptibility of Common Aquatic Plants
  (Table 19-1) (PDF 80kb)
- Classification of Weeds According to Response to Various Foliage Sprays
  (Table 18-2) (PDF 62kb)
Other Herbicide Recommendations for Water Weeds
- Algae and Vascular Submergents
Related Links

Precautions

Cattails in non crop areas (roadsides, fencerows, ditch banks, drainage ditches).
After catkins are fully formed and up to frost.
Do NOT disturb sprayed plant.
Do NOT apply where water will be used for irrigation, drinking or other domestic uses.
Do NOT apply where water is not wholly confined to user's property.
Apply at a spray volume of 1000 L/ha (400 L/ac) water.

Precautions

Apply higher rates for emergents such as Duckweed.
Apply early in season to surface of water using min. 450 L/ha of water and agitate. *Calculate ha m = surface area in sq. m X depth in m/10,000.
Treat ONLY a small portion of the pond at one time to avoid oxygen depletion and fish suffocation.
Do NOT use in domestic water supplies or water bodies producing fish for human consumption
Do NOT irrigate with treated water for one year.
Do NOT apply to ponds or irrigation ditches having desirable trees or plants on the perimeter or to areas where there roots may extend, or in locations where the herbicide may be washed or moved in contact with the roots.
Do NOT drain ponds into areas containing desirable plants.
Not effective in flowing water.

Precautions

Duckweed.
Apply by directed surface spray on foliage.
Rate depends on water depth
- less than 1.5 m - use 18.3 L/ha (7.4 L/ac)
- more than 1.5 m - use 25-29.2 L/ha (10.1-11.8 L/ac)
Use in 1700-2200 L/ha (680-880 L/ac) water.
See Reward note in previous section.