Algae form a greenish to black scum on the soil or in thin turf. As this blackish scum dries, it appears as a crust that later cracks. Algacides or fungicides can help control algae problems when wet conditions are also corrected. Fungicides such as Daconil 2787 or Algaen-X are labeled for control of algae. Caution should be used.
Excessive rates are toxic to grass plants.
Prepared by Paula Flynn , Department of Plant Pathology Iowa State University , Ames, Iowa. This information subject to a usage policy .