The urediniospores of Japanese specimens on ohia were similar in size and morphological characters to those of P. psidii reported by Ferreira (1989), Gallegos and Cummins1981), Lindquist (1982), and Rayachhetry et al. (2001)Table 3). Furthermore, the ITS sequence clustered with that of P. psidii in the phylogenetic tree (Fig. 2). Therefore, we identified the rust as P. psidii. This report is the first in Japan of both a rust disease on ohia and the causal fungus P. psidii.We propose the name ‘‘sabi-byo’’ of ohia in Japanese.
In the pathogenicity test, Eucalyptus amplifolia andE. rudis, which have not been reported as host plants, were infected with P. psidii (Fig. 3). In addition, we confirmed that this rust fungus infected E. camaldulensis, E. microcorys, E. tereticornis, E. viminalis, and Myrtus communis as previously reported (Alfenas et al. 2003; Coutinho et al.998; Rayachhetry et al. 2001) (Table 1). Because P. psidii has a wide host range in the family Myrtaceae, measures should be taken to prevent spread of this rust to eucalyptus,myrtle, and other plants cultivated in Japan.
Acknowledgments This study was supported in part by a grantin-aid of the research project for utilizing advanced technologies in agriculture, forestry and fisheries (No. 18037) administered by the Ministry of Agriculture, Forestry and Fisheries in Japan. We are
deeply grateful to T. Ozaki, Exotic Plants Inc., for providing plants for inoculations.
The urediniospores of Japanese specimens on ohia were similar in size and morphological characters to those of P. psidii reported by Ferreira (1989), Gallegos and Cummins1981), Lindquist (1982), and Rayachhetry et al. (2001)Table 3). Furthermore, the ITS sequence clustered with that of P. psidii in the phylogenetic tree (Fig. 2). Therefore, we identified the rust as P. psidii. This report is the first in Japan of both a rust disease on ohia and the causal fungus P. psidii.We propose the name ‘‘sabi-byo’’ of ohia in Japanese.
In the pathogenicity test, Eucalyptus amplifolia andE. rudis, which have not been reported as host plants, were infected with P. psidii (Fig. 3). In addition, we confirmed that this rust fungus infected E. camaldulensis, E. microcorys, E. tereticornis, E. viminalis, and Myrtus communis as previously reported (Alfenas et al. 2003; Coutinho et al.998; Rayachhetry et al. 2001) (Table 1). Because P. psidii has a wide host range in the family Myrtaceae, measures should be taken to prevent spread of this rust to eucalyptus,myrtle, and other plants cultivated in Japan.
Acknowledgments This study was supported in part by a grantin-aid of the research project for utilizing advanced technologies in agriculture, forestry and fisheries (No. 18037) administered by the Ministry of Agriculture, Forestry and Fisheries in Japan. We are
deeply grateful to T. Ozaki, Exotic Plants Inc., for providing plants for inoculations.
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