A new grapevine leaf rust (GLR) was found to be caused by Phakopsora montana. This new fungus naturally infects Crimson Glory vine (Vitis coignetiae), forming uredinia and telia on the leaves. Under experimental conditions, the fungus was pathogenic to table grape cultivars Delaware and Kyoho (V. × labruscana), Amur River grape (V. amurensis), and V. ficifolia, on which it produced urediniospores. Inoculation experiments proved that the pathogen alternates hosts, forming spermogonia and aecia on Meliosma tenuis. The new pathogen resembles P. meliosmae-myrianthae (=P. euvitis), a common GLR fungus; however, its spermogonial/aecial stage is restricted to M. tenuis, contrary to P. meliosmae-myrianthae with its spermogonial/aecial stage restricted to M. myriantha. Aeciospores of the new pathogen are evenly thin-walled, whereas the aeciospore wall is conspicuously thickened apically in P. meliosmae-myrianthae. Phakopsora montana is known to occur only on V. coignetiae in nature; however, table grape cultivars Delaware and Kyoho were not resistant to P. montana under experimental conditions. These results indicate that P. montana has caused a certain proportion of the GLR disease recorded in Japan with a possible mixed infection with P. meliosmae-myrianthae.
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Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, JapanUniv Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan
Pota, Siriporn
Chatasiri, Sinchai
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Novartis Crop Protect Thailand Ltd, Bangkok 10310, ThailandUniv Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan
Chatasiri, Sinchai
Unartngam, Jintana
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Kasetsart Univ, Fac Agr Kamphaeng Saen, Nakhon Pathom 73140, ThailandUniv Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan
Unartngam, Jintana
Yamaoka, Yuichi
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Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, JapanUniv Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan
Yamaoka, Yuichi
Hosaka, Kentaro
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Natl Museum Nat & Sci, Dept Bot, Tsukuba, Ibaraki 3050005, JapanUniv Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan
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Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan
Biotechnol Ctr Ho Chi Minh City, Div Microbial Technol, Dist 12, Ho Chi Minh City 71507, VietnamIbaraki Univ, Fac Educ, Mito, Ibaraki 3108512, Japan