<i>Aureobasidium microstictum</i> (Bubák) W.B. Cookeによるカンゾウ類葉枯病(新称)

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タイトル別名
  • Leaf blight of day lily caused by Aureobasidium microstictum (Bubak) W.B. Cooke.
  • Aureobasidium microstictum(Bubak)W.B.Cookeによるカンゾウ類葉枯病(新称)〔英文〕
  • Aureobasidium microstictum Bubak W . B

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Brown spots and yellow stripes were observed on leaves of Hemerocallis fulva var. kwanso at the herbal garden of Kyoto Prefectural Research Institute of Agriculture in Ayabe in the late June of 1985. In the beginning, small brown spots appeared on both sides of the leaves and then bright yellow stripes occurred and brownings expanded gradually from the leaf tips. These symptoms had been observed until mid-November. No pathogen was generally observed on diseased leaves, while acervuli composed of the tightly interwoven hyphae were formed on host plants in moist chamber. Conidiogenous cells were clavate to subcylindrical. Conidia were blastic, ellipsoidal to fusoid, hyaline, smooth, one-celled. Inoculation tests indicated that isolates were pathogenic on injured leaves of H. fulva var. kwanso, H. fulva var. disticha, and H. fulva var. fulva. An isolate from naturally infected H. fulva var. disticha showed the same pathogenicity as those from H. fulva var. kwanso. On PDA medium, single conidium isolates formed creamy and yeastlike colonies at first, then after formed white hyphae, and eventually turned dark brown to black in color. Growth on PSA medium occurred in the range from 8 to 30C and optimum growth at between 20 and 24C. Conidia formed on PDA medium were blastic, ellipsoidal to fusoid, hyaline, smooth, one-celled. Secondary conidia were formed and yeastlike growth appeared. On the basis of its morphological characteristics and pathogenicity on the plants of the genus Hemerocallis, the present fungus was identified as Aureobasidium microstictum (Bubák) W.B. Cooke, and a common name, leaf blight, was proposed.

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