150 EXPERIMENT STATION RECORD. 



604). — The author, in resumption of previous work on Scolecotrichum (E. S. R., 

 23, p. 46), mentions the fact that this disease, known in Sweden for about 20 

 years and associated with too strong a liming of the soil, is best controlled by 

 the application of ammonium sulphate, a remedy already in successful use by 

 cultivators in more southern lands. 



A Sclerotium disease of blue joint and other grasses, A. B. Stout (Wis- 

 consin 8ta. Research Bui. IS, vp. 207-261, 2j?s. 8). — A study is reported of a dis- 

 ease of blue joint and other grasses, which was begun by the author in the 

 summer of 1907. 



The disease is due to the fungus 8. rJdsodes, which attacks the leaves of 

 various grasses, causing them to become dried, rigid, and bent into character- 

 istic shapes. Upon the leaves felts of mycelium are produced from which 

 sclerotia are developed. The development of the fungus on the leaves is most 

 vigorous during April and May, when the death of the entire culm may result. 



The fungus has been found on 11 species of grasses about Madison, Wis., being 

 especially destructive to Calamagrostis canadensis, which serves as its principal 

 host. It 'is vigorously parasitic on the leaves, less so in the buds and stems, 

 and but slightly so on the roots, where it assvmaes some of the characteristics 

 usually associated with mycorrhiza. 



The fungus is said to be of considerable economic importance, having de- 

 stroyed or dwarfed as much as 45 per cent of the plants of C. canadensis in a 

 meadow near Madison, Wis., in the season of 1911. It seems to be quite gen- 

 erally distributed throughout Wisconsin, but has not been reported elsewhere in 

 America. 



Further data are desired on additional host plants, geographic range of the 

 fungus, economic importance, germination of the sclerotia, and infection of the 

 seedlings. 



A bibliography of the subject is included. 



Potato crop and seed, O. Appel {Illus. Landw. Ztg., 31 {1911), No. 15, pp. 

 134-136; ahs. in Centm. Bakt. [eic], 2. Abt., 31 {1911), No. 11-16, pp. 396, 

 397).— In continuance of previous work (E. S." R., 21, p. 243; 22, p. 347; 23, 

 p. 148) the author discusses the various potato diseases of Germany in connec- 

 tion with the problem of their prevention as related to seed tubers and their 

 treatment. The recommendations made include (1) sufficient drying on har- 

 vesting to check multiplication of bacteria and permit formation of wound 

 cork, and (2) the selection of good sized tubers from healthy and well bearing 

 plants. 



Blackleg of potato, W. Behrens and G. Mabpmann (Ztschr. Angew. 

 Mikros., 16 {1911), No. 4, pp. 91^99; ahs. in CentU. Bakt. [etc.], 2. Aht., 32 

 (1912), No. 6-12, pp. 326, 327; Bot. Centhl., 119 {1912), No. 8, p. 192).— The 

 authors report that an examination of plants injured by insects and affected 

 by this disease showed no bacteria directly, but it is claimed that culture 

 methods gave 7 characteristic species of which 2 appeared able to produce 

 the disease. These are described. It is suggested that inoculation on a larger 

 scale, and under more nearly natural conditions than those employed, might 

 lead to more positive results. 



Inheritance of leaf -roll disease, A. Schmid {Illus. Landw. Ztg., 31 {1911), 

 No. 17, p. 160; aljs. in Centhl. Bakt. [etc.], 2. Aht., 31 {1911), No. 11-15, pp. 

 331, 332). — The recent invasion of parts of Switzerland by this disease and 

 resulting decrease of crops led to an experimental study of the iwssible heredi- 

 tary effects of its attacks. Nineteen sound and 19 diseased tubers of like sort 

 and size from the same field were planted and the resulting vegetation and 

 crops compared. It was found that the plants from the diseased tubers were 

 backward and showed the characteristic leaf-roll form, while the crop was 



