花木類花弁の灰色かび病菌による汚染とその伝染源としての役割

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  • Infestation of petals of ornamental woody plants with Botrytis cinerea and its role as infection sources.
  • カボクルイ カベン ノ ハイイロカビビョウキン ニ ヨル オセン ト ソノ デ

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Infestation of fresh petals of various ornamental woody plants with Botrytis cinerea Pers. was examined throughout the year from June 1982 to May 1983 by culturing the pieces of fresh petals on PDA plates. In total 1049 pieces were used for the isolation tests. Botrytis cinerea and Alternaria spp. showed highest isolation rate, being 21% for each genus. The fungi belonging to the genera Epicoccum, Colletotrichum, Phomopsis, Macrophoma and Pestalotiopsis also infested fresh petals with moderate isolation rate from 4 to 16%.<br>Of 53 plant species used for isolation tests, fresh petals of 31 species belonging to 23 genera of 15 families had been infested with B. cinerea. Relatively high infestation percentage, from 10 to 40%, was recorded during spring through early summer and low one, around 5%, during late autumn through winter. Moreover, numerous conidial masses of B. cinerea were observed on the fallen petals of 28 plant species which belong 19 genera of 14 families, throughout the year. No seasonal variation was observed in conidial production on fallen petals. From these isolation tests and field observations it seems to be sure that these conidia play an important role as the infection source of the fungus throughout the year.<br>Besides petal infestation, the disease development of gray mold on leaves by adhering fallen petals infested with the fungus was recorded on Cornus florida, Hypericum chinense, Nerium indicum, Osmanthus aurantiacus and Stewartia pseudocamellia. Among them, four except C. florida were new hosts for B. cinerea.

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