Although Nostoc is not technically a type of algae, herbicides labeled for moss and algae are often the most effective at killing Nostoc. It is best to apply the herbicide when the lawn is dry. Be careful to follow the directions carefully to avoid damaging the surrounding turfgrass.

Can you burn Nostoc?

Some nurseries have had success with using heat to kill Nostoc, using hand-held flame-throwers or tractor-mounted propane heaters. Repeated treatment may be necessary to prevent re-establishment of Nostoc colonies. Soil solarization can also be effective.

How do I get rid of green slime in my yard?

Products that contain potassium salts of fatty acids may be used to kill it in lawns. Three such products are Bayer Advanced Moss and Algae Killer, Safer Brand Moss and Algae Killer, and Garden Safe Moss and Algae Killer Concentrate (there may be others).