Golf Course Management

JUL 2018

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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07.18 GOLF COURSE MANAGEMENT 71 the USDA Agricultural Research Service, Rutgers University, North Carolina State University and the Ohio State University teamed up to put this issue to rest. Starting with a collection of more than 4,000 isolates of fungi causing symptoms of dollar spot on a variety of plant hosts from around the world, the group investigated several genetic regions and morphological characteristics in these fungi from a sample of representative isolates. e genetic information was sub - jected to phylogenetic analysis, a tool used to assess genetic and evolutionary relationships among organisms and to build family trees. Phylogenetic analysis showed that there was not one, but four distinct species of dollar spot fungi, and that these fungi did not be - long in any known fungal genus presently described (Figure 1). New names A new fungal genus, named Clarireedia, was established to represent the pathogens discovered through the pylogenetic analysis (4). e new genus name is a tribute to C. Reed Funk, Ph.D., the influential turfgrass scientist and breeder who pioneered the de - velopment of turfgrass cultivars resistant to dollar spot disease ("Clarus" is Latin for "famous", and "reedia" is in honor of Funk). Four species of dollar spot fungi are now de - scribed within the genus Clarireedia: C. jack- sonii, C. monteithiana, C. homoeocarpa and C. bennettii. Clarireedia jacksonii, named in honor of Noel Jackson, Ph.D., for his work on dollar spot in the 1970s, is globally distributed and, to date, has only been found on cool-season grass hosts (Figure 2). Clarireedia monteithi - ana, named for John Monteith, Ph.D., the scientist to first describe dollar spot in 1927, is also globally distributed and has only been found on warm-season grass hosts (Figure 3). Together, C. jacksonii and C. monteithi - ana likely account for the majority of dol- lar spot epidemics observed worldwide. e species name "homoeocarpa" was retained for historical context, as C. homoeocarpa and has been found only on red fescue (Festuca rubra) hosts in the United Kingdom, while C. bennettii (named for F.T. Bennett) has been found primarily on cool-season grass hosts in the Netherlands, United Kingdom and United States. e renaming and reclassification of the Figure 3. Clarireedia monteithiana. (Top) Numerous infection centers on bermudagrass turf. (Bottom) Close-up of lesions. Photos by Lane Tredway

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