Poa trivialis, rough bluegrass, is light green and spreads via its above-ground stolons. The leaves of rough bluegrass may have a reddish hue. Though difficult to identify early in the growing season, Poa trivialis usually begins to stand out by late summer when it begins to look brown. Its brown appearance may mimic a fungal infection but with proper Poa trivialis identification, you may want to treat infested areas and employ cultural practices like proper watering and mowing to control Poa trivialis.