How is duckweed eliminated from ponds?


Quick Answer

Duckweed in ponds can be eliminated primarily by using three methods: applying herbicides or using biological or mechanical weed control mechanisms. Duckweed is one of the more difficult aquatic weeds to eradicate. However, using the proper control mechanism for the pond can be very effective in controlling weed populations.

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Full Answer

Herbicides typically come in the form of sprays, and can eliminate several types of plants, including duckweed. Herbicides contain different chemicals that are ideal for targeting specific types of plants. Some herbicides only eliminate certain plant species while others are effective in eradicating most varieties of plants. Herbicides also vary in their levels of toxicity, and while some are relatively benign and pose little harm to humans and pets as well as plants and animals living in ponds, others act as poisons and may harm surrounding organisms. Duckweeds are resistant to most broadleaf herbicides, but are responsive to other herbicides, such as fluridone and diquat. Biological controls for duckweed include adding organisms to the affected pond that rely on duckweed for food. These organisms include some fish, insects and microorganisms. These consumers may prevent excessive growth of duckweed populations, but are ideally used along with herbicides or mechanical controls such as skimmers, which are nets that vary in size and depth, and work by scooping up duckweed.

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