Brachysporium 屬菌による植物の疾病 (IV) : 禾本科並に莎草科植物の葉枯病(新稱)に就て (I) : 第1號菌群の研究
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The prosent paper deals with five new leaf blight diseaes of certain plants of the Gramineae and Cyperaceae and Brachysporium sp., belonging to the group I, parasitic on the Gramineae and Cyperaceae. 24 strains of Brachysporium in question, found in Japan, can be divided into six groups by their morphological, Physiological and also pathological charactoristics. The group I is including seven strains of Brachysporium in zuestion, which are found on Oryza sativa L. (rice plant), Capsicum onnuum L. (pepper), Echinochloa crusgalli BEAUV. subsp. submutica HONDA var. typica HONDA, Coix Lachryma-Jobi L. var. frumentacea MAKINO [C. agretis (non LOUR.) MIQ.], Cynodon Dactylon PERS. Alopecurus agrestis L. and Cyperus Iria L. respectively Detailed morphological physiological and pathological studies indicate that these seven strains n question are identical with each other. Accordingly brachysporum Tomato (ELL. et BERTH.) HIROE et WATANABE, which is the scientific name of the species on Capsicum Annuum L., belonging to the group I of Brachysporium is proposed to each strains of this group. All strains grow vigorously on various culture madia with a dark grey cottony appearance, and forming many black stalked bodies which are sclerotial bodies of the fungus, on such agar media as apricot decotion, synthetic media with peptone, and with asparagine. A moderate sporulation is secured on various agar media, among them, especially on apricot decoction agar much sporulation is secured. The optimum temperature for the mycelial growth is almost the same in all strains, being 32℃ on SAITO's onion soy agar. All strains of this group grow scarcely at a temperature above 40℃. The inoculation experiments showed that these strains are parasitic on many species of the Gramineae and one species of the Cyperaceae, as above mentioned, and also on wheat. The length of conidia of these strains measures more than twice the width.
- 1935-11-15
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