1. Purple speck, or “Shihan”, is caused by a fungus which is new to science. The name, Cercosporina Kikuchii, is suggested for this organism. 2. The fungus also attacks leaves, stems and pods to a certain extent. 3. When the fungus is grown on the glucose media, it turns the solutions purple. This mycelial extraction in water also exhibits a similar color, which is insoluble in ether, petrol ether, chloroform, benzine, terpentin oil and carbon bisulphide. This pigment becomes red with acid, and exhibits pale greenish discoloration, when the solution is added with alkali and left for a few minutes. 4. Myceliai extraction in alcohol exhibits bright red color, which becomes rich green with. alkali and red with acid. This pigment is soluble in ether, chloroform, acetone and terpentin oil, but insoluble in benzine, carbon bisulphide, petrol ether and water. 5. It seems that the early varieties are more susceptible than the late ones. It is also noticed that the varieties of big beans are more or less susceptible as compared with those of the smaller beans. The authors wish to express their heartiest thanks to Dr. S. Hori for many valuable suggestions
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.