Brachysporium 屬菌による植物の疾病(VI) : 禾本科並に莎草科植物の葉枯病(新稱)に就て(3) : 第4號菌群の研究
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The present paper deals with pathological studies on three new leaf blight diseases of certain plants of the Gramineae, caused by Brachysporoim sp., belonging to the group IV. The group IV includes five strains of Brachysporium in question, which are found on Oryza sativa L. (rice plant), Capsicum annuum L. (chilli), Cynodon Dactylon PERS., Eleusine indica GAERTN., and Coix Lachryma-Fovi L. var. frumentacea MAKINO (C. agrestis (non LOUR.) MIQ.) respectively. Detailed morphological, physiological and pathological studies indicate that these five strains in question are identical with each other. Accordingly Brachysporium senegalense SPEGAZZ_NI, which is the scientific name of the species on certain species of the group IV of Brachysporium is proposed to each strains of this group. All strains grow vigorously on various culture media with a dark grey cottony appearance, having grey or white center, and forming many black stalked bodies which are sclerotial bodies of the fungus, on synthetic media with asparagine. A moderate sporulation is secured on various agar media, such as SAITO's onion soy agar, apricot agar, corn meal agar, potato jujce agar, and synthetic media with peptone or asparagine. The optimum temperature for mycelial growth of the fungus is almost the same in all strains, being 28℃ on SAITO's onion soy agar and apricot decoction agar. All strains of this group grow scarcely at a temperature above 40℃. The inoculation experiments showed that these five strains are parasitic on the species of the Gramjneae above mentioned and also on wheat. The conidia of these strains are short fusiform and 3 to 4 septate, which is the most important characteristics of these strains.
- 1936-03-30
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