クワ胴枯病菌柄胞子の発芽条件

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  • Conditions of conidial germination in the fungus Diaporthe nomurai Hara.
  • クワ ドウガレビョウキン ヘイホウシ ノ ハツガ ジョウケン

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The percentage of conidial germination of Diaporthe nomurai HARA was low in distilled water. However, in potato dextrose medium or at an appropriate concentration of the mulberry tree extract, a high rate of germination was obtained. Conidia of the fungus could germinate in the temperature ranges of 15°C to 35°C. The percentage of conidial germination was only 19% and 53% or a relative humidity of 93% and 98%, respectively. The optimum temperature for the germination was approximately 27°C, and a relative humidity of nearly 100% was required.<br>The light conditions or darkness did not effect the germination.<br>In mulberry lenticels, the conidia of the fungus were able to germinate in the temperature range of 10°C to 35°C, the range of 20°C and 25°C being optimum. At a relative humidity of more than 93%, the percentage of conidial germination ranged from 53% to 71%, but it decreased markedly at a relative humidity between 32.5% and 86%.<br>The percentage of germination of the conidia did not increase under the optimum donditions after incubation of the conidia or a high temperature or low relative humidity for 5 days.

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