Didymella fagi sp. nov. and its anamorphAscochyta fagi, causing the yellow leaf spot disease ofFagus crenata andQuercus mongolica var.grosseserrata in Japan |
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| Authors: | Chuan Zhao Wei Yukio Harada |
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| Affiliation: | (1) Laboratory of Phytopathology, Faculty of Agriculture and Life Science, Hirosaki University, 036-8561 Aomori, Japan;(2) Present address: Laboratory of Phytopathology, Faculty of Agriculture, Shizuoka University, 422-8017 Shizuoka, Japan |
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| Abstract: | AnAscochyta fungus was obtained during a survey of leaf spot diseases ofFagus crenata in the mountains of Aomori prefecture in 1995. The pathogenicity of the fungus toF. crenata was confirmed by inoculation. Its teleomorph was first found on artificially infected leaves after the leaves were placed in an incubator at 5°C with a 12-h photoperiod (approximately 500lx, daylight strip lamps) for 4 mo. The fungus was found to be the causal agent of yellow leaf spots ofF. crenata andQuercus mongolica var.grosseserrata in the field. Comparison with similar fungi so far described from Fagaceae indicated that the anamorph isAscochyta fagi and the teleomorph is an undescribed species ofDidymella. The nameDidymella fagi is introduced for the teleomorph. Correlation between the two morphs has been proved by cultural, morphological and pathological studies. |
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| Keywords: | anamorph-teleomorph connection Ascochyta fagi Didymella fagi morphology |
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