<i>Pseudomonas cepacia</i>によるシンビジウム褐色斑点細菌病(Bacterial brown spot disease of <i>Cymbidium</i>:新称)

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タイトル別名
  • Bacterial brown spot disease of Cymbidium spp. caused by Pseudomonas cepacia.
  • Pseudomonas cepaciaによるシンビジウム褐色斑点細菌病(Bacterial brown spot disease of Cymbidium:新称)〔英文〕
  • Pseudomonas cepacia ニ ヨル シンビジウム カッショク ハ

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A new disease showing brown spot with water-soaked halo on the leaves of Cymbidium spp. occurred in Itoshima, Fukuoka, Japan during the summer in 1984. A nonfluorescent Pseudomonas sp. was consistently isolated from the infected leaves. The strains of the causal agent of the present disease were identical in being positive for the following properties: oxidase test, PHB accumulation, growth at 41 C, utilization of m-hydroxybutylate, 2, 3-butylen glycol and amylamine, and they were identical in being negative for the followings: arginine dihydrolase, nitrate reduction, denitrification, utilization of D-tartrate, itaconate and mesaconate. On the basis of their overall similarity (ca. 95%) of biochemical and nutritional tests, they were identitified as P. cepacia. These strains showed pathogenicity by inoculation to onion bulbs as well as to some orchid plants such as Cymbidium spp., Dendrobium sp. and Paphiopedilum spp. This is the first report of orchid disease caused by P. cepacia, therefore, “Bacterial brown spot disease of Cymbidium” was proposed as the name of the disease.

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