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Herbicides That Are Safe for Ponds

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Herbicides That Are Safe for Ponds

Herbicides That Are Safe for Ponds. Ponds are often infested with high levels of algae or other weed-like invasive plants that require herbicides for adequate control. Use only recommended herbicides, as this minimizes health risk to fish and desirable pond vegetation. According to the Ohio State University Extension website, not only is it...

Ponds are often infested with high levels of algae or other weed-like invasive plants that require herbicides for adequate control. Use only recommended herbicides, as this minimizes health risk to fish and desirable pond vegetation. According to the Ohio State University Extension website, not only is it important to use only recommended chemicals but also follow directly properly as this reduces need for repeat applications.
Fluridone
Fluridone is cited by the Virginia Cooperative Extension as among the most common herbicides used in ponds. The chemical is expensive but is also among the safest herbicides. Fluridone will not rid a pond of algae but is highly effective controlling submerged aquatic plants. Products containing fluridone are persistent and slow acting, remaining in the water from two to 12 months. It often takes from 30 to 90 days before results are noticeable. It is not recommended to use water treated with fluridone for crop irrigation until 30 days following application. The water remains safe for fishing, swimming or livestock and human consumption.
Glyphosate
The Virginia Cooperative Extension lists glyphosate as among the most commonly used aquatic herbicides for lakes and ponds. Glyphosate-containing products are highly effective for emergent and shore weeds, including reeds, cattails, rushes and floating water plant such as water lily and lotus. Apply glyphosate herbicides directly to the targeted plants. The chemical binds to suspended particles in the water and is rapidly inactivated. Water from ponds treated with glyphosate is safe for irrigation, fish, livestock and swimming. Before buying product, make sure it is specially indicated for use in water, as some glyphosate products are not safe in water.
Diquat
Diquat is listed by the Virginian Cooperative Extension as a highly popular, wide-spectrum herbicide safe for use in ponds. Diquat is sold under different trade names, and the products are effective for controlling submerged weeds and algae. The herbicide is not very effective for emergent weeds. The Environmental Protection Agency requires a two-week waiting period before water treated with the herbicide can be considered safe for irrigation, livestock consumption or drinking. A one-day waiting period is required for swimming and there are no restrictions for fishing. Diquat does not remain in treated water for longer than 10 days.