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Wilde suspects one local source might be an herbicide, diquat dibromide, that is used to kill hydrilla.

Duckweed and watermeal are just two types of weeds that most pond owners seek to control with chemicals such as diquat.

Furthermore, diquat doesn’t work on watermeal.

After the use of the chemical diquat, the duckweed turns brown and sinks to the bottom, which can nourish unkilled weeds, effectively making matters worse.