The Prevention of Peach Leaf-Cukl. 35Y 



slowlj, dilute to 25 gals., and strain throngli a metallic sieve into 

 the copper sulfate solution while the latter is being stirred. 



To prepare 50 gals, of the weak Bordeaux for the late spraying, 

 proceed in the same manner, using 2 gals, of the stock solution of 

 copper sulfate, 2 lbs. of quick-lime, and 48 gals, of water. 



Those conducting spraying operations on a larger scale will find 

 it convenient to prepare lif ty gallons or more of the stock solution 

 of copper sulfate, keeping it covered to prevent evaporation, and to 

 slake a considerable quantit}^ of lime at once and keep it in the 

 form of a paste in a barrel partially sunk in the ground or in a 

 trough made specially for the purpose. If the surface of the paste 

 is kept covered with a little water, the lime may be preserved for an 

 indelinite lengtli of time in this form and tlie amount required for 

 a given quantity of Bordeaux determined by testing the mixture 

 with a solution of potassium ferrocyanid in about ten parts of water. 

 A drop of this solution on being added to a solution of copper sul- 

 fate produces immediately a dark reddish brown color. When suf- 

 ficient lime has been added in the pre})aration of the Bordeanx 

 mixture, this chano^e in color does not occur on the addition of 

 potassium ferrocyanid. It is well to add a little more lime, even 

 after the test indicates a sufficient (piantity, since a large excess of 

 lime is rather a benefit than otherwise, while a sliglit excess of cop- 

 per sulfate may prove injurious to the foliage. A first-class spray- 

 ing outfit and a convenient water supply are very important where 

 much spraying is attem^^ted. 



W. A. MUERILL. 



The writer's thanks are due Messrs. King and Robinson, of Trnmausburg, Mr. 

 H. S. Wright, of Ithaca, Mr. Henry Lutts, of Youngstowu, and Mr. W. T. Mann, 

 of Barker, who have offered their orchards for the above experiments and most 

 heartily cooperated with him to make them successful. 



