Abstract
Abstract A description is provided for Puccinia horiana . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Chrysanthemum indicum, C. japonense, C. makinoi, C. makinoi var. wakasaense, C. morifolium var. sinense, C. shiwagiku, C. shiwagiku var. kinokuniense and by inoculation on C. arcticum subsp. maekawanum, C. boreale, C. nipponicum, C. pacificum and C. yoshinaganthum (Hiratsuka, 1957). DISEASE: White rust disease of chrysanthemum. First noticed as yellow spots on the upper surface, the centres of the spots later turn brown. On the underside of the leaves, raised buff, pinkish, waxy pustules develop which later turn whitish and become quite prominent. Severe infection leads to complete loss of crop. GEOGRAPHICAL DISTRIBUTION: Africa (South Africa); Asia (China, Japan); Australasia (New Zealand); Europe (Austria, Belgium, Denmark, France, Great Britain, Finland, Germany, Netherlands, Norway, Sweden). (CMI Map 403, Ed. 2, 1966) TRANSMISSION: Sporidia disseminated by water splash account for the spread in individual plants. Importation of infected plants accounts for its rapid spread in new territories.
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