352 EXPERIMENT STATION RECORD. [Vol.35 



[Reports on ^ape downy mildew] (Rev. Vit., 43 {1915), Nos. 1096, pp. 17, 

 18; 1097, pp. 31-33; 1098, pp. 48, 49; 1099, pp. 64-69; 1100, pp. 73-88; 1101, 

 pp. 93-107; 1102, pp. 113-120; 1103, pp. 133-143; 1104, PP- 153-168; 1105, pp. 

 173-184; 1106, pp. 206-209; 1107, p. 229; 1108, pp. 233-242; 1109, pp. 253-260; 

 1110, pp. 278-285; 1111, pp. 296-301; 1112, pp. 316-322; 1113, pp. 336-338; 1114, 

 pp. 350-356; 1116, pp. 388-392; 1117, p. 410; 1119, pp. 4^(7-450; 1120, p. 465).— 

 This series of articles is made up of information and suggestions received dur- 

 ing the latter part of 1915 from correspondents at numerous points in France 

 and some in neighboring countries regarding the appearances, phenomena, and 

 effects of grape downy mildew, and regarding such related or unrelated factors 

 as insects, black rot, weather conditions, and susceptibility, with some discus- 

 sion of experiences and observations during previous years. 



Downy mildew in Aude, F. CAZENA^^: {Prog. Agr. et Vit. {Ed. V Est -Centre), 

 36 {1915), No. 34, pp. 188-190). — The author reports that 10 sprayings with Bur- 

 gundy mixture containing 2 per cent copper sulphate applied during the period 

 from May 12 to August 12 gave adequate protection against downy mildew. 



Downy mildew on direct-bearing grapevines, S. Obiedoff, J. Baquero, and 

 D. V. Pehlivanoglou {Prog. Agr. et Vit. {Ed. I'Est-Centre), 36 {1915), Nos. 

 SO, pp. 82-88; 31, p. 117, figs. 2). — This is a report on the phases and degrees of 

 recent attack by grape downy mildew on direct bearers which have been con- 

 sidered as nearly or quite immune to such attack. Only a very limited number, 

 however, are said to have proved resistant. 



Causes of success or failure of grape downy mildew, L. Ravaz {Prog. Agr. 

 et Vit. {Ed. VEst-Centre), 36 {1915), No. 32, pp. 125-130) .—The author dis- 

 cusses the employment of different concentrations and frequencies in the sprays 

 used against grape downy mildew, and the probability of the development of 

 a strain of this fungus more than ordinarily resistant to fungicides. 



Treatment for downy mildew in rainy years, G. Hekon {Prog. Agr. et Vit. 

 {Ed. VEst-Centre), 36 {1915), No. 34, pp. 185-188). — The author's observations 

 are said to indicate that in years of heavy rainfall a solution of 2 to 3 per cent 

 copper content is preferable to the usual strengths used in copper sprays. Of 

 these sprays Burgundy mixture is preferred, especially in the acid form, which 

 is said to maintain on leaves and fruits a certain amount of soluble copper. It 

 is thought prudent to apply after heavy rains a simple treatment consisting of 

 a 0.4 or 0.5 per cent solution of copper sulphate. It is suggested that cupric 

 powders may also be profitably employed. 



Copper fungicidal powders, H. Fonzes-Dtacon {Prog. Agr. et Vit. {Ed. VEst- 

 Centre), 36 {1915), No. 28, pp. 37-41).— It is claimed that acid powders contain 

 copper soluble in water, which is capable of exercising immediate fungicidal 

 action upon mildew spores, and also copper soluble in water containing carbon 

 dioxid, which is also capable of acting upon the spores, but more slowly. Too 

 high acidity may scorch both leaves and fruits. Neutral powders contain copper 

 more or less readily soluble in rain water charged with carbon dioxid, giving a 

 slower fungicidal effect. The alkaline powders do not seem to be effective in 

 this regard. 



The influence of temperature on decomposition in Bordeaux mixture, O. 

 Butler {Prog. Agr. et Vit. {Ed. VEst-Centre), 36 {1915), No. 27, pp. 15-18, 

 pi. 1). — A discussion is given of differences in the properties and effects of 

 Bordeaux mixture corresponding to variations in the composition, temperature 

 during preparation, and age of the mixture. 



Treatment of grapevines with hot water and hot sprays, L. Semichon 

 {Rev. Vit., 43 {1915), No. 1096, pp. 9-12).— This is mainly a reply by the author 

 to some criticisms of the claims regarding the real temperatures of hot water 



