DISEASES OF PLANTS. 435 



Is Bordeaux mixture detrimental to the yield of potatoes in 



dry seasons? J. Samek {Tirol, landic. Blatter, l.'i {18!J1), \o. ti, pp. 

 (js-7(i). — The author sprayed varieties of potatoes with Bordeaux 

 mixture to ascertain its effect upon the yield during a dry season. 

 Three applications were made on the following- dates: June L', June 20, 

 and July 20. But 2 varieties w^ere affected by the disease and the 

 plats on which these grew gave 2.53 and 2.37 per cent rotten tubers. 

 The total yield ot the varieties is practically the same for treated and 

 check plats. In 3 varieties the yield of the treated plats was greater 

 than their checks by 21.5, 2.8, and 2.7 per cent, respectively. In the 

 others the greater yield was in favor of the untreated plats, the percent- 

 ages of increase being 14.2, 11.0, and 1.0. 



Bordeaux mixture for the prevention of potato rot, W. M. Blair 

 {Canada Exptl. Farms Bpt. isfr^j, p. 2:22). — Experiments were conducted 

 by the author on the experimental farm at Nappan, l^ova Scotia, with 

 Bordeaux mixture as a preventive of the potato rot. Two applications 

 were given to 13 varieties, half of each plat being left untreated. With 

 some varieties there were more pounds of rotten potatoes on the treated 

 than on the untrciited parts of the plat, but most showed a slight advan- 

 tage in favor of the treated plats. In all but 4 varieties the total yield 

 of the treated plats was greater than that of the checks. 



Bordeaux mixture for potato rot, T. A. Siiakpe {Canada Exptl. 

 Farms Fpt. 1893, p. SH(i). — A plat of potatoes at the experimental farm 

 of British Columbia was given 4 applications of Bordeaux mixture for 

 the prevention of rot. The sprayed tops were vigorous and healthy until 

 ripe, there being no blight on them, while the plants on the check plat 

 were badly affected. When harvested the yield Was 248 bu. per acre 

 from the untreated plat, 75 jier cent of which were marketable, as com- 

 pared with 270 bu. from the treated plat, 85 per cent of which were 

 marketable. 



Spraying for rust, W. Sai'NDERS {Canada Exptl. Farms Rp. 1893, 

 p. 33). — Experimental plats of oats and wheat were sprayed with a 

 solution of copper carbonate. On some of the plats a second spraying 

 was given, but there was no perceptible difference between the sprayed 

 and unsprayed i)ortions, and tlie fungicide seemed to have no effect in 

 preventing attacks of rust. 



Smut in wheat, W, Saunders {Canada Exptl. Farms Rpt. 1893, p. 

 41). — A copy of a circular addressed to the farmers of Manitoba and 

 the Northwest Territory is given in which the bunt or stinking smut of 

 wheat is described, and directions given for applying a solution of 

 copper sulphate (1 lb. in 3 gal. of water to 10 bu. of seed wheat). 

 This is sprinkled over the wheat, the grain stirred thoroughly so that 

 every grain may be wet. The seed should be sown shortly after the 

 treatment as the fungicide lessens in some degree the germinating 

 power of the wheat, especially when it remains long in contact with it. 

 Tests have been conducted at some of the farms showing that it is the 



