SPRAYING KXPKKIMENTS AND APPLE DISEASES. 5 



Plot I 1 8 trees, bordeaux mixture, 3-3-50 formula. 



Plot 2 35 trees, lime-sulphur, 20 per cent stronger than 

 standard dilution. 



Plot 3 36 trees, lime-sulphur, standard dilution (1.5 gals. 

 29° Baume, home-cooked concentrate 

 diluted to 50 gals.) 



Plot 4 35 trees, lime-sluphur, standard dilution, first appli- 

 cation omitted. 



Plot 5 36 trees, "Soluble sulphur," 2 pounds to 50 gal- 

 lons of water. "^ 



Plot 6 36 trees, "Atomic sulphur," 7 pounds to 50 gallons 

 of water.* 



Plot 7 18 trees, unsprayed check. 



Plot 8 18 trees, i pound of dry arsenate of lead in 50 gal- 

 lons of water. 



Plot 9 18 trees, 2 pounds of dry arsenate of lead in 50 gal- 

 lons of water. 



Plot 10 18 trees, standard dilution lime-sulphur plus i 

 pound of arsenite of zinc to 50 gallons. 



The orchards bloomed profusely and at the time of the first 

 spraying there was promise of a full crop of fruit. IMention 

 has been made of the weather conditions which prevailed dur- 

 ing the first part of the season. Between May 8 and the close 

 of the month somewhat over 4 inches of rain fell, many of the 

 days were cloudy and cold with prevailing northwest winds. 

 Freezing temperatures were recorded on May 14, 15 and 21. 

 This resulted in very imperfect pollination and apparently many 



* The Soluble sulphur and Atomic sulphur are proprietary spray ma.- 

 terials and were supplied by the manufacturers, the Niagara Sprayer 

 Company Middleport, New York, and the Thomsen Chemical Company, 

 Baltimore, Maryland. The former in the literature sent out last spring 

 recommended that their soluble sulphur compound be used for spraying 

 trees in foliage at the rate of is to 2 pounds to each 50 gallons of water. 

 Mr. W. M. Scott, pathologist for the Thomsen Chemical Company in 

 correspondence stated that Atomic sulphur should be used at the rate of 

 7 pounds to 50 gallons of water but that a greater quantity would do no 

 harm. His letter and supply of material did not arrive till after the date 

 of the first application. Hence it was necessary to purchase a supply 

 from their State agency which recommended that Atomic sulphur be 

 used at the rate of 14 pounds to 50 gallons. This was done at the first 

 spraying but 7 pounds were used in the last two. 



