When having issues with managing duckweed, there are multiple methods that may be used to efficiently reduce or remove this problematic species.
Chemical Treatments to Control Duckweed:
- Flumioxazin is an excellent, low cost contact herbicide, that costs between $75 and $145 per acre, but requires contact every plant, must be sprayed over the entire water surface, and requires one to two treatments a year.
- Diquat has a fair to good success ratio, it is a low cost contact herbicide, that costs between $125 and $250 per acre, but it requires contact with every plant, so it must be sprayed over the entire water surface. It requires one to four treatments a year.
Chemical Treatments to Eradicate Duckweed:
- Fluridone is a long lasting systemic herbicide that offers a good chance of eradicating the species and can simply be poured into the water, but is pricey at $625 to $1,250 per acre.
- Penoxsulam is somewhat long lasting systemic herbicide that offers perhaps the best chance to eradicate the species and can be poured in the water, but costs $555-2,572 per acre.
- Aeration is great for the fish and healthy bacteria and it will help deepen a pond by digesting any organic sludge that has built up
- Using fish to control duckweed is a common remedy. Tilapia manage duckweed and remove up to 20%, but it may not have any effect when stocked in ponds with existing bass populations
Additional information on Texas A&M AgriLife Extension Aquaculture, Fisheries and Pond Management
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