Journal of Japanese Society of Turfgrass Science
Online ISSN : 1884-4022
Print ISSN : 0285-8800
ISSN-L : 0285-8800
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Volume 49, Issue 2
Displaying 1-7 of 7 articles from this issue
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Original Paper
  • Re-Identification of Clarireedia spp. Causing Dollar Spot Disease of Turfgrasses in Japan
    Takao Tsukiboshi, Toshihiro Hayakawa, Koya Sugawara
    2021 Volume 49 Issue 2 Pages 71-77
    Published: March 31, 2021
    Released on J-STAGE: March 31, 2022
    DOIhttps://doi.org/10.11275/turfgrass.49.2_71
    JOURNAL OPEN ACCESS
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    The pathogen causing dollar spot disease in turfgrasses, formerly identified as Sclerotinia homoeocarpa, was re-identified by morphological and phylogenetic analyses based on ribosomal DNA internal transcribed spacer (rDNA-ITS) sequences. Eighty-nine isolates of the pathogen were collected from 26 Prefectures in Japan, and 63 isolates from turfgrasses, including creeping bentgrass, Kentucky bluegrass, perennial ryegrass, Manila grass, Zoysia grass, and centipedegrass were identified as Clarireedia jacksonii, the most common global pathogen of cool-season grasses. Eighteen isolates from warm-season grasses (e.g., Zoysia grass and bermudagrass) were identified as Clarireedia monteithiana, the worldwide distributing pathogen of warm-season grasses. Eight isolates, mainly from bentgrass, clustered into a phylogenetic group that differed from the previously reported species; the group was tentatively named Clarireedia sp. TG1. Tests for pathogenicity and hyphal growth response to temperature revealed that C. jacksonii was more virulent to bentgrass than Zoysia grass, with optimal hyphal growth at 25ºC. C. monteithiana showed pathogenicity to both grasses, with optimal growth at 28ºC. Clarireedia sp. TG1 was also pathogenic to the grasses. Clarireedia spp. geographic distributions showed that C. jacksonii is found throughout Japan, mainly as a cool-season turf pathogen, and C. monteithiana occurs in western Japan as a warm-season turf pathogen.

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