Septoria steviae に起因するステビアの斑点病

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書誌事項

タイトル別名
  • Ｓｅｐｔｏｒｉａ　ｓｔｅｖｉａｅに起因するステビアのはん点病
  • Leaf Spot Disease of Stevia Caused by <i>Septoria steviae</i>
  • Septoria steviae ニ キインスル ステビア ノ ハンテンビョウ

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説明

A new disease of Stevia rebaudiana Bertoni was found in Kagawa Prefecture in the early July of 1978 and named as the leaf spot disease of stevia. In the beginning, small brown spot occurred on the leaves and gradually developed to round to rectangle or irregularity expanded, large, brown to dark-brown spots. Eventually these leaves were defoliated. Many pycnidia of a species of the genus Septoria were formed on relatively old spots. Original isolate (S-O=IFO 31181) was obtained from a pin-size spot on the leaves. The growth of this isolate on PSA medium was very slow. Sectors of the black (S-B) and the white (S-W) colonies which grew considerably well on various agar media were formed in abundance during culture. Inoculation tests indicated that all of these three isolates (S-O, S-B and S-W) were pathogenic on stevia leaves, but not on leaves of Erigeron annuus and Chrysanthemum morifolium. The maximum mycelial growth of the S-B isolate on PSA and stevia leaf decoction agar was found at 25C and in a range of pH 5.5 to 7.0. Since the leaf spot symptoms caused by S. erigerontis and S. solidaginicola were found on the leaves of two Compositae plants, E. annuus and Solidago altissima, respectively, which were growing near stevia fields, the morphological and pathogenic characteristics of these fungi were compared with the stevia fungus. S. solidaginicola was different from the Stevia fungus in the size of the pycnospores on host plants. S. erigerontis was different from the stevia fungus in its cultural characteristics and did not show any pathogenicity on stevia leaves. On the basis of the pathogenicity on stevia and its morphological characteristics, the present fungus was considered as a new species causing the leaf spot disease of stevia and a new name for the fungus, Septoria steviae sp. nov., was proposed.

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