Duckweed can be brought to your pond by bird migration.  Seeds can be transplanted by the birds feet.  Duckweed can be very detremental to the health of your pond or lake simply by sheilding the much needed sun rays.  Sun helps produce oxygen for our pond through photosynthesis. Duckweed can be treated. Some of the more effective treatments can be expensive.  The most effectiive treatment is using Fluridone in a liquid form for the treatment of Duckweed. Fluridone need to get into the water column.  It is not designed to spray on the duckweed.  The sun breaks down the chemical too quickly and will not be effective. 

Duckweed, while small in size, can pose significant challenges for pond management. This aquatic plant grows rapidly, often covering the entire surface of a pond. This dense coverage can block sunlight from reaching other aquatic plants, disrupting photosynthesis and leading to their demise. The lack of sunlight can also reduce oxygen levels in the water, which is detrimental to fish and other aquatic life. Furthermore, duckweed’s rapid growth makes it difficult to control and remove, often requiring regular and labor-intensive maintenance. If left unchecked, a duckweed infestation can transform a clear, healthy pond into a murky, imbalanced ecosystem. Therefore, while duckweed may seem harmless, its impact on a pond can be substantial and problematic.