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dibromide #872757

Asked June 12, 2024, 9:52 AM EDT

Weeds in my lake have been treated with diquat dibromide. Can I use the residue as mulch in my vegetable garden?

Isabella County Michigan

Expert Response

Hello,

Thank you for using Michigan State University Extension ask Extension with your aquatic herbicide question. Diquat Dibromide formulated for aquatic uses is an indiscriminate herbicide that burns back of plants to kill them.  Because it is designed to be used in aquatic environments it tends to linger in the soil and sediment longer not breaking down or washing away as quickly as other herbicide formulations.  For that reason, I think that it is likely to cause harm from residuals in your gardens. 

I do not recommend using herbicide treated seaweed as a garden much or in your compost. 

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