dark green algae or fungus - Knowledgebase Question

cincinnati, Oh
Question by msweeney001
October 31, 2009
i have a dark green patchy, almost slimey type of algae or some type of fungus on the NW side of my yard.the area is about 25'x8' not much grass grows there. what can i put on it to get rid of it that is safe for pets.

Answer from NGA
October 31, 2009


The algae has found a shady, moist area in which to grow. The soil is acidic and compacted and the nutrition is poor - perfect conditions for algae growth. To control it you'll need to improve the compaction to help the soil drain quickly. Start by raking out the algae infested areas. You can rent a core aerator to pull plugs from the soil, then sprinkle about a half inch of compost or sand over the area. Water from the sprinkler or rainfall will help work the compost or sand into the holes make by the aerator. This matter will help improve soil drainage. Just leave the plugs on the lawn and they will dissolve over time. The compost will add nutrients, which will encourage deeply rooted turfgrass. It may be a little too late in the season to overseed now, but you can overseed in the springtime. Best wishes with your lawn.

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