814 Agricultural Experiment Station, Ithaca, N. Y. 



treatments: 1. Bordeaux mixture made May 18, it having been 

 allowed to stand since that time and receiving onlv an occasional 

 stirring; 2. Bordeaux mixture freshly prepared;^ 3. No treat- 

 ment; 4. Copper chloride mixture. f The materials were applied 

 with a knapsack pump and Yermorel nozzle. It was found that the 

 application could be made very satisfactorily in this manner with 

 the exception of section ], which received the old Bordeaux mix- 

 ture. The sediment settled so fast that it was mostly applied before 

 one-half of the required amount of liquid had been used, in spite of 

 repeated shaking of the tank by the operator. This necessitated a 

 second treatment immediately after the first, the work being started 

 at the opposite end of the section. 



On July 23 the above treatments were repeated with the excep- 

 tion that section 1 received but one application, the distribution 

 being still more uneven than the first time. There was some indi- 

 cation of early blight, yet not enough to distinguish whether the 

 treatments had been of value. 



August 28, however, showed a marked difference in the appear- 

 ance of the sections. The third, which was untreated, had fully 

 50 per cent of its leaves badly affected ; the first was as bad as 

 the check where little of the sediment had been applied, but where 

 the spraying had commenced, and consequently upon that part 

 which received most of the solid contents of the knapsack pump 

 the foliage was much better, scarcely 10 per cent of the leaves 

 showing serious injury. Section 2 also appeared very thrifty, since 

 the foliage averaged fully as well as the best parts of section 1. 

 Section 4, the one which was treated with the copper chloride mix- 

 ture, appeared to have fully 25 per cent of its leaves seriously 

 attacked. Section 2 was again sj)rayed with fresh Bordeaux mix- 

 ture, the other sections remaining untreated. 



Other observations were made September 12, At this time the 

 relative amounts of early blight appeared to be about the same as 

 two weeks previous. The part of section 1 which bad received 

 most of the sediment was in as thrifty condition as section 2, which 



*The Bordeaux mixture was made accordiiii^ to the "Normal" formula; 

 copper sulphate, 6 pounds; quicklime, 4 pounds; water, 45 gallons. This mix- 

 ture contains copper sulphate at the rate of 1.6 per cent of the weij;ht of water 

 used. 



t This mixture was made by dissolving 3 ounces copper chloride in 24 gallons 

 of water, and then to this solution was added Bounces of slacked quicklime. 



