Commonly Used Aquatic Herbicides in Pennsylvania
Application and Permit for Use of an Algicide, Herbicide, or Fish Control Chemical in Waters of the Commonwealth
| Aquatic Herbicide | Active Ingredient | Controls | Dosage | Notes |
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FOR ALGAE
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| Algae Pro |
Copper, elemental 7% (triethanolamine complex) |
Algae (planktonic, filamentous) Chara |
0.75 gal/acre-ft 1.5 gal /acre-ft |
Treat one-third to one-half of the pond at a time |
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Aquashade/Lesco Hydroblock |
Acid blue 9 dye 23.6% |
filamentous algae, early suppressionof some submerged plants | 1 quart/acre-ft | Use early and with little or no overflow |
| Copper Sulfate | CuSO4 99% | Algae, flagellated protozoans | 0.68 to 1.36 lbs/acre-ft | Treat half of pond at a time; toxic to trout; more toxic in soft water |
| Cutrine-Plus |
Copper, elemental 9% (triethanolamine complex) |
Algae (planktonic, filamentous) Chara and nitella |
0.6 gal/acre-ft 1.2 gal/acre-ft |
Toxic to trout; calculate dose for upper 4 feet of water |
| Cutrine-Plus (granular) | Copper, elemental 3.7% (ethanolamine complex) |
Algae (planktonic, filamentous) Chara and nitella |
60 lbs/acre | For bottom-dwelling algae; toxic to trout |
| Hydrothol 191 | Monopotassium salt of endothall |
Algae (planktonic, filamentous) Chara and nitella |
0.6 to 2.2 pts/acre-ft | Toxic to trout |
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FOR SUBMERGED PLANTS
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| Aquathol-K | dipotassium salt of endothall 40.3% | Pondweed (potamegeton), milfoil, coontail, naiad | 0.6 to 1.9 gal/acre-ft | Three-day fish consumption restriction |
| Hydrothol 191 | monopotassium salt of endothall 53% | Naiad, elodea, coontail, pondweed, milfoil | 0.7 to 3.4 gal/acre-ft | Fish can be killed at dose greater than 0.4 gal/acre-ft; 7- to 14-day water-use restriction |
| Komeen | Copper, elemental 8% (ethylenediamine complex) | Watermilfoil, elodea, pondweed, coontail (not an algicide) | 1.7 to 3.3 gal/acre-ft | Toxic to trout |
| Reward | diquat dibromide 35.3% | Coontail, elodea, naiad, pondweed, milfoil | 1 to 2 gal/acre | 2- to 5-day irrigation restriction |
| Sonar A.S./Avast! | fluridone 41.7% | Bladderwort, coontail, fanwort, elodea, hydrilla, naiad, pondweed, watermilfoil |
<5 ft deep: 0.16 to 1.25 qt /acre |
Use with little or no overflow; split treatment maintains more constant concentration |
| Sonar SRP/Avast! SRP | fluridone 5% | Bladderwort, coontail, fanwort, elodea, hydrilla, naiad, pondweed, watermilfoil | 0.54 to 1.08 lbs/surface acre | Use with little or no overflow |
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FOR FLOATING PLANTS
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| Navigate/Aqua-Kleen | 2,4-D (20 to 27.6%) |
Water lily, spatterdock, watershield. Also milfoil, bladderwort |
150 to 200 lbs/acre 100 to 150 lbs/acre |
Granular 2,4-D formulations. |
| Reward | diquat dibromide 35.3% | Duckweed | 1 gallon/acre | Surfactant use recommended. |
| Rodeo/Eagre | glyphosate 53.8% | Water lily, spatterdock, watershield | 0.5 to 0.9 gal/acre | Can be applied during active growth until later summer |
| Sonar A.S./Avast! | fluridone 41.7% | Duckweed, watermeal, spatterdock, water lily |
<5 ft deep: 0.16 to 1.25 qt/acre |
Use with little or no overflow; split treatment maintains more constant concentration. |
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FOR EMERGENT PLANTS
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| Reward | diquat dibromide 35.3% | Cattail | 1 to 2 gal/acre | Surfactant use recommended. |
| Rodeo/Eagre | glyphosate 53.8% | Cattail, arrowhead, purple loosestrife, common reed | 0.75 gal/acre | Can be applied during active growth until later summer |