19171 DISEASES OP PLANTS. 647 



Some observations on fungus diseases of oiltivated plants In Turkestan, 

 N. G. Zapkometov {Otchet Prakt. Mikol. Turkest. Ent. Sta., 1914; 0't>s. in Mat. 

 Mikol. i Fitopatol. Ross., 1 (1915), No. 4, pp. 125, 126). — Special attention was 

 given by the author to diseases which appeared to be very prevalent In orchards 

 and vineyards of Turkestan. Much damage was done to grapevines by the 

 spotted anthracnose, the disease caused by Cercospora vitiphylla, and Oidium. 

 Among other diseases noted, apple scab and leaf and twig curl of peaches, 

 apricots, and almonds are reported as abundant. 



A monograph of the TJredineae, P. and H. Sydow (Monographia JJredir 

 nearum seu Specierum Omnium ad Hunc Usque Diem Cognitarum Descriptio et 

 Adum^bratio Systematica. Leipsic: Bomtraeger Bros., vol. 3, Nos. 1 {1912), pp. 

 1-192, figs. 83; 2 {1914), PP- 193-416, figs. 76; S {1915), pp. 417-726, figs. 36).— 

 These three numbers deal descriptively and systematically with Pucciniacese, 

 Melampsoraceae, Zaghouaniacese, and Coleosporiaceae through the several species. 



The wintering of Coleosporium solidaginis, E. B. Mains {Phytopathology, 

 6 {1916), No. 4, pp. 371, 372).— According to the author, C. solidaginis has been 

 found wintering over in the rosette leaves of Solidago sp., both as mycelium 

 and uredospores. 



The mosaic disease of tomatoes and petunias, H. A. Aixabd {Phytopathology 

 6 {1916), No. 4, PP- 328-335, figs. 2).— While engaged in the study of the dis- 

 tribution of the virus causing mosaic disease in tobacco plants, the author also 

 carried on parallel experiments with tomatoes and petunias affected with the 

 same disease. 



In comparison with the disease obtained by inoculation with the virus of 

 mosaic-diseased tobacco, tomato or petunia plants inoculated with the virus 

 of other solanaceous plants affected with the mosaic disease show no appreci- 

 able difference in the incubation period, symptoms, etc. With the exception 

 of slight variations in the external symptoms produced in these host plants, 

 the author considers that the mosaic disease of tobacco affects the petunia 

 and tomato in quite the same manner as it affects the tobacco plant. 



A bacterial disease of western wheat grass (Agropyron smithii), P. J. 

 O'Gaba {Phytopathology, 6 {1916), No. 4, pp. 341-350, pis. 5).— A detailed ac- 

 count Is given of an investigation of a bacterial disease of wheat grass due 

 to Aplanohacter agropyri n. sp., a preliminary account of which has already 

 been noted (E. S. R., 34, p. 349). 



Notes on an artificial culture of Bhizoctonia crocorum, W. W. Diehi, 

 {Phytopathology, 6 {1916), No. 4, pp. 336-340, fig. i).— The author reports hav- 

 ing grown R. crocorum from alfalfa on synthetic media and having found 

 that the fungus made a very slow growth on the media used. The peculiar 

 cultural characteristics of the organism are considered to indicate that its 

 metabolism, in artificial cultures at least, is affected by an accompanying 

 species of Fusarium. 



Sclerotinia blight, a serious disease of snap beans caused by S. libertiana, 

 J. A. McClintock {Virginia Truck Sta. Bui. 20 {1916), pp. 419-428, figs. 4). — 

 A popular account is given of a disease of snap beans caused by S. libertiana, 

 which appeared in tfie vicinity of Norfolk, Va., in 1915. The disease developed 

 after a period of several days of hot, damp weather, and the fungus appeared 

 upon the stems, branches, leaves, and pods, causing considerable loss. In ad- 

 dition to the attack in the field, secondary losses were caused by the fungus 

 on diseased pods spreading to healthy pods in transit to market. 



Experiments in the control of the disease showed marked variation in re- 

 sistance to the blight, some varieties being almost wholly unaffected. For con- 

 trc* of the trouble the author recommends the burning over of the fields so 

 as to destroy as much rubbish as possible and the rotation of crops, avoiding 



