アラカシQuercus glauca T.葉の新病害「輪紋葉枯病」とその病原菌について

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  • アラカシ Quercus glauca THUNB. 葉の新病害「輪紋葉枯病」とその病原菌について
  • アラカシ Quercus glauca T.ヨウ ノ シン ビョウガイ リンモン ハガレビョウ ト ソノ ビョウゲンキン ニ ツイテ
  • On a new Pestalotia disease of the leaf of Quercus glauca THUNBERG and its causal fungus

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The authors founded a new disease of leaf on Quercus glauca THUNB., it caused by Pestalotia sp., and these speciemens were collected at Kasagicho prefectural Kyoto (Nov. 1956.), at Tokuzentani Sakyoku Kyoto (Dec. 1956.), at valley of Suwayama of Kobe (Mar. 1957.), at Takagamine Kitaku Kyoto (Nov. 1958.). This report was described with a morphological, physiological characters and the results of inoculation experiments of the causal fungus. The acervulus was formed in the ring spot on the epydermis of leaves, the conidia have brownish two cells at middle, rarely have three cells, and the flagella have length of almost two times to the conidia. On the potato agar medium the fungus formed hard conidial mass after culture for 20∿25 days only on cultures in short period since the fungus were isolate from the host, however, it did not form at all subcultures on the media used experiment thereafter, but it formed again on the culture of non-radiation side that perhaps received diffuse ray. The diffuse ray occurred when a half part of the cultures were radiated with ultora-violet ray. This result is only once experiment, so it is necessary reexperiment. The optimum temperature of growth to the fungus mycelium on potato agar medium seemed at about 24℃, and leathal temperature of the mycelium was at 50℃ for 10 minutes in water bath. On the pH of the medium the mycelium growth seemed vigorous at 4.8∿6.0. In the inoculation experiments mycelium of the causal fungus showed all positive only wounded leaves by needle on Quercus glauca THUNB., Q. dentata THUNB., Castanea pubinervis SCHNEID., Cryptomeria japonica D. DON., Theae sinensis L., Eriobotrya japonica L., but on the Diospyros Kaki THUNB., Ficus Carica L. showed all not phathogenicity. The authors named "Ring spot blight of Quercus glauca THUNB." and determined its species name as "Pestalotia kasagiensis YEH et KATSURA sp. nov."

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