What will kill nostoc algae?

To kill nostoc algae, options include using herbicides designed to target algae or cyanobacteria, which are effective in breaking down the nostoc mats. Non-toxic alternatives like vinegar or hydrogen peroxide can also be used to kill nostoc. A diluted bleach solution is another powerful option, but it should be used with caution to avoid damaging surrounding plants or soil. Reducing excess moisture and improving drainage in the affected area is an important step in preventing future outbreaks of nostoc.