Dollar spot is a common foliar disease that occurs on most types of turfgrasses (bentgrass, bermudagrass, bluegrass, buffalograss, fescue, ryegrass, and zoysiagrass) throughout Oklahoma. However, this disease is often most severe on turfgrass in residential lawns maintained under a low nitrogen fertility program and on bentgrass golf greens. In Oklahoma, dollar spot is most prevalent in late spring and early fall when high humidity and cool nights favor the formation of dew that is present on turfgrasses for extended periods.