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To kill nostoc on gravel, start by physically removing the mats with a rake or shovel. Once the bulk of the nostoc is removed, you can apply a targeted herbicide designed for algae or cyanobacteria. If you prefer a natural solution, vinegar or hydrogen peroxide can also be used to kill nostoc on gravel. A diluted bleach solution may also be effective but should be used carefully to avoid harming surrounding plants or soil. Ensuring proper drainage in the gravel area will also help prevent future growth of nostoc.
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BNO Team