1917] DISEASES OF PLANTS. 749 



Septoria angularis, 8. antirrhinonim, S. argemones, S. nsterina, 8. JUcoria, 

 8. urticaria, and S. wistarice; and the new varieties Cercospora euphorbicecola 

 tragiw, and C. pulcherrimw minima. 



Uredinales of Porto Rico based on collections by H. H. Whetzel and K W. 

 Olive, J. C. Abtetctk (■ilpcologia, 9 (1917), No. 2, pp. 55-iO^).— Following the 

 collection of fungus material during the spring of 1916 by Whetzel and Olive 

 and its systematic study by the author, 122 species of the Uredinales are listed. 

 A number of these are regarded as new species or treated as new combinations, 

 some being of more or less importance in connection with ornamental or useful 

 plants. A list is given of species previously reported from Porto Rico. 



A short-cycled Uromyces of North America, G. R. Bisby {Abs. in Phyto- 

 pathology, 7 (1917), No. 1, p. 74). — It is claimed that there are only 11 species 

 of short-cycled Uromyces found in North America and that these are parasitic 

 upon six families of monocotyledons and dicotyledons. 



A systematic and physiolog'ical study of rusts, G. M. Reed, d R. Huesh, 

 and W. E. Beentzel {Missouri Sta. Bui. 147 {1917), p. 28). — A report is given 

 of tests under greenhouse conditions of 46 varieties of oats belonging to 9 

 species of Avena to determine their susceptibility to the crown rust of oats 

 {Puccinia coronifera). Only one variety showed any degree of resistance and 

 on this the rust developed to maturity. Additional tests were made with a 

 number of species of grasses, and although the different grasses are Iniown to 

 be hosts of the rust P. coronifera, no infection was obtained by using uredospores 

 from oats, this result indicating the existence of physiological races in this rust. 



Notes are briefly reported on rust infection on varieties of wheat. With few 

 exceptions, the varieties tested were all found badly infected with orange leaf 

 rust {P. triticina). 



A fundamental study of the physiolo^cal relation of the powdery mildews 

 to their hosts, G. M. Reed {Missouri Sta. Bui. 1J,7 {1917), p. 27).— The author 

 summarizes the results of previous investigations (E. S. R, 35, p. 651) in which 

 he described the relation of powdery mildew to varieties of Triticum and Avena. 

 In addition to the data previously reported, it is stated that a large number of 

 experiments have been conducted with varieties of barley in relation to barley 

 mildew, most of the varieties tested proving quite susceptible. 



Control of Phytophthora infestans in the floating g'ardens of Xochimilco, 

 A. Madaeiaga and R. Villaeeeal {Bol. Dir. Agr. [Mex.l, 2 (1916), No. 2, pp. 

 55-57). — This is a discussion of local conditions affecting the success of culti- 

 vated plants in the floating gardens, more particularly the tomato, as affected by 

 P. infestans, with suggestions for protection against that fungus. 



Economic hosts of Sclerotinia libertiana in tidewater Virginia, J. A. Mc- 

 Clintock {Abs. in Phytopathology, 7 {1917), No. 1, p. 60). — In the warm, 

 humid climate of tidewater Virginia, S. libertiana is said to be a serious para- 

 site of lettuce, snap beans, tomatoes, winter-grown parsley, cauliflower, and 

 eggplants. 



A new strain of Puccinia graminis, E. C. Stakman and F. J. Piemeisel 

 {Abs. in Phytopathology, 7 {1917), No. 1, p. 75). — The authors report a rust 

 which behaves differently from any of the common biologic forms of P. graminis. 

 This has recently been found on club wheat and a number of wild gi-asses, and 

 is said to occur only west of the Rocky Moimtains in Idaho and Washington, 

 where it seems to take the place of ordinary P. graminis tritici. 



Grain-smut investigation and control, G. M. Reed {Missouri Sta. Bui. 147 

 {1917), pp. 27, 28). — Inoculations with spores of Sphacelotheca sorghi were 

 made on 22 varieties of sorghum, including broom corn, kaoliang, and Kafir com, 

 four of which, feterita, Jerusalem corn, dwarf milo maize, and milo maize, 



