Rose rust in the Botanic Garden, Faculty of Agriculture, Hokkaido University, Sapporo [Japan]
1996
Iwama, T. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture) | Harada, Y.
In the fall of 1993 and 1994, severe outbreaks of rust disease, caused by Phragmidium mucronatum (Fr.) Schlecht., were found on cultivated roses (Rosa hybrida) in the Botanic Garden, Faculty of Agriculture, Hokkaido University, Sapporo. Thirteen cultivars out of 19 grown there were effected by the disease. The rest species is widely distributed through the world. In Japan, however, it has been collected only once in Ito, Shizuoka Prefecture in 1933. By urediniospore inoculations, P. mucronatum parasitized R. rugosa f. alba and R. iwara (R. rugosa x R. multiflora) as well as cultivated roses. In the same place, P. rosae-rugosae Kasai was found to occur on R. rugosa. The latter rust species also parasitized, by urediniospore inoculations, R. rugosa f. alba and R. iwara but did not cultivated roses. R. iwara was regarded as a new host for both rust species
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