Host range of the smut species Ustilago nuda and Ustilago tritici in the tribe Triticeae

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Abstract
Thirty-seven species of the genera Aegilops, Agropyron, Elymus, Eremopyrum, Haynaldia, Hordeum, Secale, and Taeniatherum in the tribe Triticeae and six species of the genus Lolium in the tribe Festuceae were tested for their reaction to loose smut of barley, Ustilago nuda, and loose smut of wheat, U. tritici. One new host for U. nuda was found: Hordeum violaceum. Fifteen new hosts for U. tritici were found: Aegilops caudata, Ae. ovata, Ae. triuncialis, Agropyron caninum. A. fibrosum, A. scabrifolium, Elymus canadensis, E. dahuricus, E. virginicus. Haynaldia villosa, Hordeum brachyantherum, H. jubatum, H. marinum, Secale silvestre, and Taeniathernm crinitum. Six new hosts for both U. nuda and U. tritici were found and they are the first known common hosts for these fungi: Agropyron scabriglume. A. striatum, A. tsukushiense var. transiens, Hordeum bogdanii, H. brevisubulatum, and H. compressum. On all these hosts, the sori of U. nuda were covered by a thin membrane or peridium whereas the sori of U. tritici were naked. Spores formed on all hosts germinated in the manner typical for the species used for inoculation. The wild barley common in Canada. Hordeum jubatum, differentiated between races of loose smut of wheat, U. tritici. Six species of Lolium were resistant to U. nuda and U. tritici.
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