648 EXPERIMENT STATION RECORD. 



trix, T. tritici, Aphelenchiis fragarics, and A. olesistus in relation to various 

 economic plants. 



New nematode genera found inhabiting fresh water and nonbrackish soils, 

 N. A. CoBE {Jour. Wash. Acad. 8ci., 3 {19 IS), No. 16, pp. 432-4U, fi9- i).— De- 

 scriptions are given of 26 proposed new genera with a type species for each 

 genus. About 73 per cent of these are found in arable soils in various parts 

 of the world and nearly 50 per cent of them on the Arlington Farm af the 

 United States Department of Agriculture. About 90 per cent are newly dis- 

 covered forms, the rest resulting from further investigation of forms already 

 described. 



The chemical action of copper as used against cryptogamic diseases, E. 

 Pisovscni {Rev. 06n. Sci., 24 {1913), No. 21, pp. 787, 788).— This is a theoretical 

 discussion of copper compounds as used against cryptogamic diseas^es and of 

 the chemical processes involved, including the influence thereon of carbonic 

 acid, ammonia, etc., in the air. 



Cereal diseases and injuries in 1912, E. Riehm {CentU. Bakt. [etc.], 2. Abt., 

 39 {1913), No. 4-7, pp. 81-107). — This is a very condensed review of contribu- 

 tions appearing in 1912, dealing with animal and other injuries, also parasitic 

 and nonparasatic diseases of cultivated cereals and some uncultivated plants. 



An extensive bibliography is appended. 



Fungi causing foot rot of cereals in France, A. Prunet {Compt. Rend. 

 Acad. Sci. [Paris], 157 {1913), No. 22, pp. 1079-1081).— The author states that 

 foot rot or stalk disease of cereals, which is spreading in Prance, is caused 

 ordinarily by one or more of three different fungi, Ophio'bolus graminis, 

 0. herpotrichus, and Lcptosphc&ri herpoirichoides, superficially much alike. 



A disease of forage plants, P. Berth ault {Bui. Soc. Agr. France, 1913, 

 Dec. 1, pp. 288, 284, M- 1)- — This is a brief discussion of Pscudopeziza medica- 

 ginis, which is said to have shown recently a tendency to cause serious damage 

 to crops of alfalfa, clover, and sainfoin in parts of France. 



Influence of artificial infection with dry rot on the sugar content of beets, 

 L. Garbowski {AJ)s. in Bl. Zuckcrruhenl)au, 20 {1913), No. 11, pp. 165, 166).— 

 Contact of sound beets with portions of diseased ones is said to have resulted 

 in very small differences in the sap as regards sugar content. The amount is 

 thought to have been due largely to infiltration and to wounding of the roots 

 employed. 



Report on clover canker, E. Haack {Illus. Landw. Ztg., 33 {1913), No. 23, 

 p. 218, figs. 2). — The author reports, from his district on the west side of the 

 Rhine, severe damage from clover canker in 1913, preceded by dry summers in 

 1911 and 1912 with heavy precipitation in the fall of the latter year. A few 

 varieties named were not seriously affected. 



Cucumber rot, O. F. Burger {Florida Sta. Bui. 121 {1914), PP- 95-109, figs. 

 6). — This is a detailed account of the author's investigations on the bacterial 

 disease of cucumber, a preliminai-y report of which has been noted (E. S. R., 

 30, p. 149). 



In addition to describing the disease and its cause, the author gives an 

 account of spraying experiments in which Bordeaux mixture was used for the 

 control of the disease, and it was found that on thoroughly sprayed vines 17 

 per cent of the cucumbers were affected with the disease as compared with 

 35 per cent on the sprayed vines. In other experiments it appeared that 

 irrigation and the application of nitrate of soda to cucumbers rendered them 

 more susceptible to the trouble. 



Diseases of flax, W. Daijlimore {Roy. Bot. Gard. Kew, Bui. Misc. Inform., 

 No. 9 {1913), p. 335). — The author mentions as rather troublesome at times in 



