Mycosphaerella chaenomelis sp. nov.: The teleomorph ofCercosporella sp., the causal fungus of frosty mildew inChaenomeles sinensis, and its role as the primary infection source |
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Authors: | Yasuo Suto |
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Institution: | (1) Shimane Prefecture Forest Research Center, Shinji-cho, Yatsuka-gun, 699-0401 Shimane, Japan;(2) Present address: 5-11-46, Agenogi, 690-0015 Matsue-shi, Shimane, Japan |
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Abstract: | A leaf spot disease called frosty mildew was observed onChaenomeles sinensis throughout Japan. Small brown spots with white tufts occurred followed by successive defoliation. On the fallen leaves, minute
black dots are formed. The causal fungus was regarded as a new species ofMycosphaerella, M. chaenomelis, andCercosporella chaenomelis in anamorph. Pathogenicity of the fungus was confirmed only inC. sinensis by inoculation experiments. Colonies of the fungus grew well on potato sucrose agar, and grew at 10–30°C with an optimum
temperature of 25°C. The fungus overwintered on the fallen diseased leaves in the form of pseudothecia, and ascospores served
as the primary infection source from April to June. |
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Keywords: | Cercosporella chaenomelis Chaenomeles sinensis leaf spots Mycosphaerella chaenomelis primary infection source |
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