544 EXPERIMENT STATION RECORD. 



Identification of species of Fusarium occurring on the sweet potato, 

 Ipomoea batatas, H. W. Wollenwebeb (U. 8. Dept. Agr., Jour. Agr. Research, 

 2 (1914), No. 4, pp. 251-286, pJs. 5).— The author describes 13 species and 

 \arieties of Fusariuiu found occurring on the sweet potato, only a few of which 

 are actively parasitic. The species and varieties described are F. radicicola 

 n. sp., F. incarnatum, F. culmorum, F. caudatum n. sp., F. caudatum volutum 

 n. var., F. orthoceras, F. orthoceras triseptatum n. var., F. hatatatu n. sp., F. 

 oxysporum, F. hyperoxysporum n. sp., F. acuminatum, Hypomyces ipomoece, and 

 Gibberella sauMnetii. 



A bibliography of oiled literature is appended. 



A disease resembling gummosis, J. A. Honing (Meded. Deli-Proefstat. 

 Medan, 7 (1913), No. 10, pp. 465-468). — Cases are discussed in which symptoms 

 (in particular the stripes near the leaf bases) closely conforming to those con- 

 sidered as characteristic of gummosis in tobacco, due to Bacillus solanacearum, 

 are claimed to have been associated with an organism differing therefrom in 

 some important characters. The stripes also are said to show on close inspec- 

 tion a greater breadtli than those due to the bacteria which cause gummosis. 



Cicinnobolus parasitic on apple mildew (Oidium farinosum), O. Obeb- 

 STEiN (Ztschr. Pfianzcnkrank., 23 {1913), No. 7, pp. 394-396) .—The author, 

 noting that Cicinnobolus, previously reported by him as parasitic on Sphcerotheca 

 mors-uvw, has been found on oak mildew (0. quercimim) by Vuillemin (E. S. 

 R., 24, p. 352), also possibly on other fungi, states that he has recently been 

 able to confirm De Bary's listing of Cicinnobolus sp. as parasitic on 0. fari- 

 nosum. 



Contribution to the life history and physiology of Cylindrosporium on 

 stone fruits, B. B. Higgins {Amer. Jour. Bot., 1 {1914), ^o. 4, pp. 145-173, 

 pis. 4)- — This contribution, which in its present form contains a bibliography, 

 has already been noted from another source (E. S. R., 30, p. 750). 



Peach yellows investigations, H. S. Reed {Rpt. State Ent. and Plant Path. 

 Va., 9 {1912-13), p. 20). — A brief account is given of a cooperative experiment 

 begun between the State Crop Pest Commission and the department of plant 

 pathology of the Virginia Station for the purpose of making investigations on 

 the nature and control of peach yellows. In this experiment a number of trees 

 from the western part of the State, where the disease was very prevalent, have 

 been planted in the eastern part of the State, where the disease is unknown. 

 These will be kept under observation and an attempt made to discover the 

 nature of the trouble. 



Contributions on the pathology of grape stocks, J. Bernatsky (Jahresber. 

 Ver. Angew. Bot., 10 {1912), pp. 31-57). — Discussing disorders of grapevines 

 and crops as related to climate, maturity and degree of improvement in stocks, 

 weather and smoke, elevation and slope of land, qualities of soil and fertilizers 

 used, cryptogamic diseases, etc., the author mentions among injurious para- 

 sites noted, Botrytis and Dematophora glomerata. The latter fungus thrives 

 at temperatures above 7° C, inflicting much injury. It is found to be too deep 

 seated to be controlled by spraying, and to require employment of such physio- 

 logical factors as protection against strong sunlight, etc. 



Control of chlorosis by acidification of soils is said to be ordinarily too expen- 

 sive to be practical, thus requiring the selection of varieties less sensitive to 

 lime. 



Combating downy mildew of grape in 1913, L. Sauret {Prog. Agr. et Tit. 

 {Ed. VEst-Centre) , 35 {1914), No. 19, pp. 582-587).— In continuation of previous 

 work (E. S. R., 29, p. 50) the author gives an account of experiments con- 

 ducted in Narbonne in 1913 for the control of the downy mildew of grape. 



