DISEASES OF PLANTS. 743 



the author calls attention to the occurrence in tubercles on the roots of Poa 

 annua and other grasses of a slime fungus allied to Sorosphcera junci, for which 

 the name S. graminis n. sp. is proposed. A detailed account of its life history 

 and cytology will be published later. 



The rusts of white and red clover, F. D. Kern (Phytopathology, 1 (1911), 

 No. 1, pp. 3-6). — The author claims that the white clover rust is autoecious and 

 is the species originally described as Puccinia trifoUi. It therefore should be 

 known as Uromyces trifolii, while U. fallens (based on Ureclo fallens) is pro- 

 posed as the proper designaton for the common red clover rust, the iecidial stage 

 of which is as yet unknown. 



Blackleg or Phoma wilt of cabbage, T. F. Manns (Phytopathology, 1 

 (1911), No. 1, pp. 28-31, pis. 2). — Previously reported from another source 

 (E. S. R., 24, p. 348). 



Lime and artificial fertilizers as a remedy for club r'oot disease, F. K. 

 Ravn (Tidsskr. Landbr. Planteavl, 11 (1910), No. 1, pp. 163-177). — Lime was 

 found to have a decidedly favorable influence on the root crop in the 8 series 

 of experiments conducted, increasing the yields and decreasing the percentage 

 of diseased plants. The artificial fertilizers, on the other hand, were found 

 to increase the percentage of diseased roots, doubtless due to the application of 

 large quantities of superi)hosphates. 



Report of investigations concerning rice, J. S. Collier (Stuttgart, Ark., 

 1910, pp. 28, figs. 11). — In this publication, which is issued by the Arkansas 

 Rice Growers' Association, the author reports the results of a summer's ob- 

 servation on rice growing, special attention being given to rice blight and its 

 probable causes, and to rice maggot. 



The probable relationships of the following factors to blight were investi- 

 gated : Soil acidity, soil constituents, temperature, content and temperature 

 of irrigation water, shade, depth of water, wind, rain, sunshine, and the rice 

 maggot. As a result of these investigations the author concludes that the blight 

 found in the Grand Prairie region is not caused by a fungus, but is due to the 

 soil and water. It was found that new soil was more subject to blight than 

 old, and that the use of fertilizers was of no value in combating the disease, 

 while chemical analyses of rain water indicated that it would cause blight 

 much more readily than well water, especially on new soil, and that rice on 

 acid soils blighted more severely than on nonacid soils. No relationship was 

 found to exist between the rice maggot and blight. Fall plowing, thorough 

 spring preparation of the seed bed, and shallow seed planting, followed by an 

 early rolling of the soil and drying the soil for from 3 to 5 days when the rice 

 was about 30 in. high, tended to decrease the amount of blight. 



Obsevations on rice maggot have been previously noted (E. S. R., 24, p. 661). 

 The pamphlet closes with a summary of 361 answers received to questions sent 

 out to rice growers in regard to the preparation of rice lands, seeding, irriga- 

 tion of crops, prevalence of maggots and blight, crop rotation, and similar 

 points. 



Floret sterility of wheats in the Southwest, E. C. Johnson (Phytopath- 

 ology, 1 (1911), No. 1, pp. 18-27). — Previously reported from another source 

 (E. S. R., 23, p. 451). 



Observations on the w^intering-over of plant parasites, L. Hecke (Nattirw. 

 Ztsehr. Forst u. Landw., 9 (1911), No. 1, pp. 4Jf-53). — ^A special study was 

 made of the wintering-over of the uredospore stage of the yellow rust of wheat 

 (Puccinia glumarum), in which the results of fall infection with uredospores 

 are given. 



Series of pot plants were inoculated during October, November, and De- 

 cember; part <)f each series was then placed in a greenhouse, and another set 



