大豆粒の紫斑はCercosporina Kikuchii sp. n. の寄生に起因す。該菌は唯に大豆粒に紫斑を生ぜしむるのみならず、子葉、尋常葉、莢、稀には莖等にも紫褐色の斑點を出現せしむ。罹病種子を播下すれば、やがて種皮の表面に鼠毛様の黴状物密生す。之を檢鏡すれば橄欖色の檐子梗に無色長鞭状の分生胞子の着生せるを認む。本菌は莢の成長略完成せるも、未だ莢色の緑色を呈せる頃、莢壁を貫通して種實に達するものにして、紫斑部は主として種臍部の附近に多し。莢に挿傷を與ふる時は發病歩合殊に多し。本菌は特種の基體に培養せらるゝ時は夫等の基體に紫色を生ず。但し培養基の種類に依り紫色を生ぜずして褐變せしむることあり。是等の菌糸塊をアルコールに浸漬する時は、酒精液は鮮明なる赤色となる。該液は苛性加里に依り濃緑色となる。更に上述の紫、赤、兩色素の種々藥劑に對する溶解力をも研めたり。尚此外PHに關する關係、本病と耐病性品種との關係等につきても聊報告せり。
1. In 1922, an epidemic cercosporellose of the cultivated lily (Lilium Maximo-wjczii) occurred in some districts of Hokkaido. The disease is chiefly confined to the foliage of the lily plant. 2. The morphological characteristics of the causal fungus coincide pretty well with those of Cercosporella inconspicua (Wint.) von Höhnel. But, it seems to me that correct judgement should be passed by further investigations. 3. The symptoms of the disease may be divided into three distinct stages. In the primary stage, the affected areas show a powdery milew-like appearance; in the secondary stage the lesions are characterized by brownish colour, and in the tertiary stage or the final stage, a blackened and burned appearancc is characteristic. 4. According to the writer's experiments, the causal fungus hybernates in the dead tissues of the leaves.
In July, 1913, a stinking smut was first discovered on the barley (Hordeum sativum, Jessen var. vulgare) in Nagano prefecture and a few years later in Yamagata (1917?) and Gumma (1918) respectively. In May, 1923, not only the barley but also the naked barley (Hordeum sativum var. hexastichon=Hadaka-mugi) was reported as the host in Iwate prefecture. The regions above mentioned are all comparatively the northern and colder portion of Japan and at present the smut is not known in other prefectures (southern). From this fact it seems that the disease has some relation to the climate. By our investigations, it was concluded that this stinking smut, though it has first recognized in 1913, has no doubt occured since many years ago and was confused with the stinking smut of wheat (Tilletia Tritici and T. levis) by its similar odour and the covered smut of barley (Ushilago Hordei) by the resembrance of the affected ears. By comparing with Tilletia Bornmülleri, T. Hordei, T. levis, T. Secalis, T texana, T. Trabuti, T. Tritici and T. Pancicii, we found our stinking smut fungus correspond to Tilletia Pancicii Bub. et Ran. which was originally described by Bubàk in 1909 (Zeitschr. f. d. landwirt. Versuchs. in Oesterreich Jg. 12, S. 545-549, 1909). The result of macro-and microscopical studies is as follows: Sori within the ovary, blakish brown in color, concealed by the glumes, compact and not dusty, when rubbed smell an offensive fishy odour. Spores mostly globose, 18.4-23.3μ. (mostly 21.3μ.) in diam. or subglobose to ellipsoid, 19.4-26.2μ long, 18.4-22.3μ broad. Epispore blakish brown, reticulated with raised ridges 1.9-3.9μ high, 1.9-5.9μ in diameter. On Hordeum sativum, Jessen var. vulgare and hexastichon.
In 1918 Prof. M. Shirai published “On the Development of Plantpathology in Japan: A Brief Historical Sketch” in “Annals of the Phytopathological Society of Japan.” Vol. I, No. 1. He wrote chiefly on the historical facts in Tokyo and omitted those in Sapporo, the other centre of plant pathology in Japan, and he said Prof. K. Miyabe is well fitted for the purpose. In the present article I tried to write a brief history of plant pathology in Sapporo on the material supplied by Prof. K. Miyabe, and added some other facts relating to plant pathology in Japan, which I know.