New York Agricultural Experiment Station. 391 



question is often asked, Will not the Fungiroid and Paris green 

 applied together with the powder-gun produce as good results as 

 the wet Bordeaux mixture applied with a spraying machine? 

 An answer to this question was one of the objects of the experi- 

 ment. 



James A. Blanchard, 4 and 6 Gold Street, New York, has 

 patented and placed upon the market a concentrated form of 

 Bordeaux mixture, which is known as the " Lion Brand " Bor- 

 deaux mixture. It is sold in tin cans containing one gallon of a 

 thick, slate colored liquid. This quantity is to be added to forty- 

 nine gallons of water and applied with a spraying machine in the 

 ordinary way. This mixture also was tested in the experiment. 



In some sections of the United States three applications of 

 Bordeaux mixture to potatoes are considered suflScient. In other 

 sections it seems necessary to make five applications. In our 

 experiment at Floral Park, in 1895, one plat was sprayed three 

 times and another five times, the first three applications on the 

 two plats being made on the same dates. The plat sprayed five 

 times yielded ten bushels per acre more than the plat sprayed 

 three times. It was thought that the three sprayings might have 

 given better results if they had been made at sufficiently long 

 intervals to cover the entire season of growth. It was planned 

 to test this in the experiment. 



The Bordeaux mixture used for spraying orchards and vine- 

 yards is made after the 1-to-ll formula, in which one pound of 

 copper sulphate is required to make eleven gallons of Bordeaux 

 mixture. But for spraying potatoes a more concentrated form of 

 Bordeaux mixture has generally been used; namely, Bordeaux 

 mixture made after the l-to-7 formula, in which one pound of cop- 

 per sulphate is required to make seven gallons. The weaker mix- 

 ture is, of course, the cheaper and consequently the more desir- 

 able to use provided it is equally efficient. To determine the 

 relative efficiency of these two strengths of Bordeaux mixture 

 was one of the objects of the experiment. 



In the experiment at Floral Park, in 1895, it was observed that 

 Colorado potato-beetles shunned plants which had been sprayed 



