298 Bulletin 276. 



only in the clear solution above the sediment after thorough settling 

 or filtering. It is very probable that any of these commercial solutions 

 testing 32° Baume will entirely control Peach Leaf Curl at dilutions 

 of 1-9 to 1-15 or even weaker. For data in regard to the chemical 

 composition and relative value of different brands the grower is referred 

 to the recent bulletin on " A Chemical Study of the Lime-Sulfur Wash " 

 by L. L. Van Slyke, C. C. Hedges and A. W. Bosworth of the New York 

 State (Geneva) Exp. Sta., Geneva, N. Y. 



IV. Bordeaux mixture. — To prepare the mixture dissolve 4 lbs. of 

 copper sulfate in about 30 gallons of water by suspending the crystals 

 in a gunny sack just beneath the surface of the water, as the dissolved 

 vitriol settles quickly to the bottom. Prepare the lime (4 lbs.) by 

 slaking it with hot water, adding the water slowly so that the lime 

 crumbles into a fine powder. When completely slaked, i.e., entirely 

 powdered, add 5 or 6 gallons of cold water to make a rather thin milky 

 solution. When the vitriol is all dissolved, stir it thoroughly and pour 

 into it the lime milk which has been thoroughly stirred. Add enough 

 water to make 50 gallons. One solution, preferably the copper sulfate 

 as indicated above, should always be much diluted. Never pour together 

 two strong solutions and then dilute afterwards. Never pour together the 

 two solutions until ready to use. It is well to strain the mixture as it 

 goes into the sprayer to take out anything that might clog the nozzle. 

 Do not use tin or iron vessels in making the bordeaux. They will be 

 eaten by the copper sulfate. 



When large quantities of ' bordeaux are to be made, prepare con- 

 centrated stock solutions by dissolving the copper sulfate at the rate 

 of two pounds to the gallon and slake the lime one pound to the gallon 

 of water. Dilute 2 gallons of the vitriol solution in 30 or 40 gallons 

 water and add 4 gallons of the lime solution. Add water to make 50 

 gallons. 



V. Copper sulfate solution. — Dissolve 2 lbs. copper sulfate in 50 gallons 

 of water by suspending the crystals in a gunny sack just beneath the 

 surface of the water. 



