Definition of diquat
:a powerful herbicide and plant desiccant C12H12Br2N2 used especially to control aquatic weeds and to desiccate aerial plant parts (as of potatoes) before harvesting
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Duckweed and watermeal are just two types of weeds that most pond owners seek to control with chemicals such as diquat.
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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.
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Origin and Etymology of diquat
Learn More about diquat
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Britannica.com: Encyclopedia article about diquat
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