The Duckweed is a rapidly spreading aquatic plant that deprives ponds of oxygen and leads to the death of fish and beneficial algae in still waters. They create stratification caused by a buildup of leaves and they're often found in nutrient-rich ponds. Successful duckweed control for ponds covered on the surface can take several years. Prevention is the most effective and safest way of controlling duckweed. Also, you can control duckweed by removing the buildup of leaves on the bottom of the pond.

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Source: Gardening Know How