PREPAKATION OF COMBINED COlTEli AND SULPHUR SPRAYS. IGl 



Hy referring to PI. XXII and the descriptions of figures the 

 reader may obtain a good idea of the arrangement of this extensive 

 spray cooking plant, as well as of the boiler supplying steam. 



PREPAIIATION OF COMBINED COPPER AND SULPHUR SPRAYS AND NOTES ON 



OTHER SPRAYS TESTED. 



For many years the use of combmed copper and sulphur sprays has 

 been practiced ))y peach growers in Oregon, and as they have reported 

 good results th(^ writer prepared the following four fornudtc of this 

 character for the control of curl. 



BORDEAUX MIXTURE AND SULPHUR SPRAYS COMBINED. 



The formulai of the combined Bordeaux mixture and sulphur 

 sprays tested are given in the following list: 



List of sulphur sprays combined with Bordeaiuc mixture. 



3 pounds copper sulphate, 10 pounds sulphur, 20 pounds limo. 

 3 pounds copper sulphate, 10 pounds sulphur, 10 pounds lime. 

 3 pounds copper sulphate, 5 pounds sulphur, 10 pounds lime. 

 2 pounds copper sulphate, 5 pounds snli)hur, 10 pounds lime. 



In preparing these combined sprats, which were found somewhat 

 more effective in the control of peach leaf curl than the sulphur sprays 

 alone, the Bordeaux mixture was added to the fully prepared sulphur 

 spray. A portion of the lime given in the fornuda was reserved for 

 making the Bordeaux mixture, Avhile the remainder of the lime w^as 

 combined and Ijoiled with the sulphur in the manner already described. 

 When the sulphur spray had been placed in the spray tank, the Bor- 

 deaux mixture, which had been freshly prepared from the copper 

 sulphate and the remainder of the lime, was added, and after thorough 

 mixing was at once applied to the trees. The union of the yellow 

 sulphur spray with the blue Bordeaux mixture forms a spray of a 

 distinct green color. The application of this spray is similar to that 

 of the sulphur spray, requiring the same class (^f nozzles. 



MISCELLANEOUS SPRAYS. 



A large number of sprays not included in the preceding descrip- 

 tions have been prepared and tested for peach leaf curl, and some of 

 them have been discussed in other portions of this bulletin. Several 

 of them were tested for the purpose of learning the value of the 

 separate ingredients of the leading sprays, as salt, lime, etc. Among 

 these were lime, applied as a simple milk of lime; salt, applied in 

 solutions of different strengths; and lime and salt combined, applied as 

 a whitewash. Sulphur was tested in the form of sulphide of potassium, 

 applied in various strengths in liquid form, and the union of this sul- 

 phide of potassium with milk of lime was also tested. Iron sulphate, 

 19093— No. 20 11 



