White rust of <Emphasis Type="Italic">Ipomoea</Emphasis> caused by <Emphasis Type="Italic">Albugo ipomoeae-panduratae</Emphasis> and <Emphasis Type="Italic">A. ipomoeae-hardwickii</Emphasis> and their host specificity |
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| Authors: | Toyozo Sato Jun Okamoto Yosuke Degawa Shigeru Matsunari Kokichi Takahashi Keisuke Tomioka |
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| Institution: | (1) National Institute of Agrobiological Sciences, Tsukuba Ibaraki, 305-8602, Japan;(2) Oita Prefectural Agriculture, Forestry and Fisheries Research Center, Kita-usa, Usa Oita, 872-0103, Japan;(3) Kanagawa Prefectural Museum of Natural History, Odawara Kanagawa, 250-0031, Japan;(4) Technology Extension Division, Agriculture, Forestry and Fisheries Department, Oita Prefectural Government, Ohte-machi Oita, 870-8501, Japan;(5) Formerly Research Institute of Japan Plant Protection Association, Kessoku-cho, Ushiku Ibaraki, 300-1212, Japan |
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| Abstract: | In some areas of Japan, yellow spots with white pustules on leaves, stems, petioles, peduncles and calyces were found on Ipomoea nil, I. triloba, I. lacunosa and I. hederacea var. integriuscula. We demonstrated that the diseases on I. nil, I. triloba and I. lacunosa were caused by host-specific strains of Albugo ipomoeae-panduratae and defined three forma speciales of the fungus, respectively, for the three Ipomoea species: “f. sp. nile”, “f. sp. trilobae” and “f. sp. lacunosae”. Because the diseases were new to Japan, we coined the Japanese name “shirosabi-byo”, which means white rust. We also showed
that the disease on I. hederacea var. integriuscula was caused by A. ipomoeae-hardwickii. We named this new disease “white rust (shirosabi-byo in Japanese)”. |
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| Keywords: | White rust Ipomoea Albugo ipomoeae-panduratae Albugo ipomoeae-hardwickii New forma specialis |
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