3G4 EXPERIMENT STATION RECORD. 



of the experiment being to test the relative values of corrosive subli- 

 mate and flowers of sulphur. Half of each plat was retained as a 

 check, and the seed planted on the other portions or the first 5 plats 

 was treated for 1 hour with a solution of 1£ oz. of corrosive sublimate 

 to 30 gal. of water. Three of the plats receiving sulphur were given 

 7 J lbs. and the other 2 received 9 lbs. of sulphur, the sulphur being 

 dusted in the furrows before the seed was dropped. The conclusion 

 drawn from the experiment, the results of which are tabulated, show 

 that corrosive sublimate was quite efficient in checking potato scab, 

 while the sulphur treatment did not possess any special value. 



In 1897 the use of corrosive sublimate was further investigated by 

 pot experiments with favorable results. In conclusion the author states 

 that soaking potatoes for an hour in a solution of 4£ oz - 0I * corrosive 

 sublimate in 30 gal. of water is an effective treatment. If stronger 

 solutions are used the period of soaking must be diminished. 



The fungicidal action of acetate of copper compared with that 

 of the Bordeaux mixture, A. and F. Rayizza (Bol. Not. Agr., 20 

 (1898), No. 5, pp. 200-211). — The authors conducted a series of experi- 

 ments in which the fungicidal effect of acetate of copper and Bordeaux 

 mixture- as preventives of grape Peronospora were compared. Tlie 

 form of acetate of copper used was that known as Stecher's mixture, 

 consisting of 51.3 per cent acetate of copper and 11.3 per cent sulphate 

 of lime. Experiments were made in 3 different localities with these 

 substances, the weather during the summer being hot and rainy and 

 especially favorable for the development of the grape mildew. Iu the 

 vineyard where the first series of experiments was conducted the soil 

 was cultivated between the rows, wheat and vetches being alternately 

 grown, and liberal applications of cow manure and mineral phosphates 

 were given. The Steelier mixture was guaranteed to contain 350 gm. of 

 basic acetate of copper per kilo of powder. Vines were sprayed May 

 16, June 13-15, 23-21. In the first application 300 vines were sprayed 

 with a package of the Stecher powder dissolved in 50 liters of water; 

 in the second and third treatments increased strengths of solution 

 were used. In addition to spraying with Bordeaux mixture the vines 

 after being sprayed were powdered with a 3 per cent sulphate of copper 

 powder. The foliage of those vines which received the acetate of cop- 

 per was noted before the end of the season to be of a darker green 

 color than the leaves of the other vines. The Peronospora appeared 

 during the first days of July upon the vines which received Bordeaux 

 mixture and upon those receiving the Steelier powder about August 

 1. At that period, the weather being very rainy, the invasion of the 

 fungus was very rapid, especially on those vines which had been treated 

 with the acetate of copper powder. From these experiments the con- 

 clusion is drawn that while the acetate of copper was somewhat more 

 efficient than Bordeaux mixture, as it washes off" the leaves much more 

 readily, more numerous applications will be required. It is also rec- 



