Video: Algae, blue green bacteria, cyanobacteria and yellow spot

"Algae disorders of turfgrass" is a general term that describes a wide range of symptoms from yellow spots to scum layers at the surface of the thatch and soil. The scum found around thinning areas of grass, frequently in the shade, has in the past been thought to be an "after-effect" of the turf thinning that results from shade stress. The alternative perspective about the algal scum found in stressed areas is that the algae themselves are the cause of…