No. 2, March, 1921] PATHOLOGY 177 



itself, pure culture experiments, artificial infection, natural infection, and methods of pre- 

 vention. The researches of Hartig and Brefeld are reviewed critically in the light of 

 extensive recent field observations and experiments, and the author is of the opinion that 

 Dasyscypha calycina enters its host by way of dead branches or branch stubs, Fomes annosus 

 through dead roots, and Armillaria mellea through damaged or dead roots. The importance 

 of small wounds may have been greatly overestimated. Hard subsoil conditions in culti- 

 vated fields are particularly unfavorable to the first rotation of larch planted on such sites, 

 because the tap roots, being unable to penetrate the subsoil, soon die; and Fomes annosus 

 almost inevitably attacks these dead roots. First-rotation larch should be planted in mixed 

 stands — e.g., with hardwoods — so that the roots of the latter may break up the subsoil, 

 speed up aeration, and render conditions more favorable for the larch roots. Reasons for the 

 various control methods suggested are thoroughly discussed. The author closes with a 

 general summary of the important points brought out in the book. — Reginald H. Colley. 



1189. HousER, True. Root rot of tobacco. Monthly Bull. Ohio Agric. Exp. Sta. 5: 232. 

 1920. — A short discussion of symptoms of the disease, influence of soil and water, character of 

 soil in plant beds, and methods of control is given. — R. C. Thomas. 



1190. Kawakama, Koichiro, and Suehiro Yoshida. Bacterial gall on Milletia plant. 

 (Bacillus milletiae n. sp.). Bot. Mag. Tokyo 34:110-115. PL 2. 1920.— In Japan the 

 authors found that this organism causes rough, irregular, round galls from 5 mm. to 10 cm. 

 in diameter on the stems of Milletia floribunda. It is a motile organism about 2.1 -I- 0.6 

 microns, with 7 or 8 peripheral flagella; it produces no spores and is gram negative. — Leonas 

 L. Burlingame. 



1191. KiLLiAN, Karl. Ueber die Blattfleckenkrankheit der Tomate hervorgerufen durch 

 Septoria lycopersici. [Leaf spot of tomato (Septoria lycopersici).] Zeitschr. Pfianzenkrankh. 

 30:1-17. 7 jig. 1920. — The following constitutes the author's summary: Spring infection 

 with Septoria takes place exclusively through ejection of pycnospores from previous year's 

 infected leaf. Infection may be recognized in the moist chamber after five days by browning 

 and dropping oflf of the cotyledons. Eight days later spots appear at first on the lower leaf 

 surface; these when dry exhibit fruiting bodies. Similarly the young stems and older stems, 

 but not the fruits (!) are aflfected. The incubation period is directly related to weather 

 conditions. Artificial cultures indicate that Septoria is readily grown on various nutrient 

 materials. Vegetative development is favored by presence of sugar. Fruit bodies develop 

 only after vegetative development is arrested. The fungus penetrates the epide mis, later 

 the intercellular spaces, destroys the tissues of the lower-leaf surface, and finally the upper 

 surface becomes involved. Lastly its offensive action becomes weakened. In cases of 

 severe attack the diseased foliage should be burned in the fall and the surrounding soil dug 

 deeply. Compost which has come into contact with diseased plant remains should be 

 avoided. Rotation is recommended, using plants not subject to attack. — H. T. Gussow. 



1192. Lo Priore, G., and G. Scala. L'arrossamento delle foglie del Sommaco. [The 

 reddening of the leaves of sumac] Staz. Sper. Agrarie Ital. 52: 227-237. PI. 7-8. 1919. 



1193. LuTMAN, B. F. Tip burn of the potato and other plants. Potato Mag. 3^: 6-7, 20, 

 22-24; 32 : 12, 20-21. 1 fig. 1920.— Reprint of Vermont Agric. Exp. Sta. Bull. 214. 



1194. MoLLiARD, M. Tumeurs presentees par les racines du Chou-Rave et de la Bet- 

 terave. [Tumors occurring on the roots of kohl-rabi and beet.] Bull. Soc. Path. Veg. France 

 7 : 17-19. 1920. — Large tumor-like outgrowths were found on the roots of kohl-rabi and beets 

 in different parts of France. In some cases they arose from the main root and in others 

 from secondary roots. Those on kohl-rabi were at first thought to be caused by Plasmo- 

 diophora brassicae, but a histological study failed to show any evidence of this. The tumors 

 found on beets were very similar in structure and appearance to those on kohl-rabi. Myce- 

 lium of a Fusarium was found on the surface of the tumor on the beet, but is not believed 



