52 
Colorado Experiment Station 
Stock Solution. 
Where spraying is to be clone on a large scale, “stock solu¬ 
tions” of copper sulfate and lime are made up in advance. 
1. Place 50 pounds of copper sulfate in a clean gunny sack and 
suspend it just beneath the surface in a barrel containing 50 gallons 
of water. This dissolves in 12 to 24 hours. One gallon of the solu¬ 
tion contains i pound of copper sulfate. 
2. Slake 50 pounds of good cjuality stone lime in a barrel and 
add water to make 50 gallons. When stirred, i gallon contains i 
pound of lime. 
Preparation of 4-5-50 Formula From Stock Solutions. 
1. Stir stock solution thoroughly. 
2. Put 4 gallons of stock solution of copper sulfate in one of 
the half barrels and add water to make 25 gallons. 
3. Put 5 gallons of stock solution of lime in the other half 
barrel, and add water to make 25 gallons. 
4. Mix, following directions as given in preparation of 4-5-50 
formula from fresh solutions, under 3, 4, 5, and 6. 
5. After removing enough of the stock solutions for one 
spraying, mark on the barrels by nailing strips of boards just at the 
top of the solutions. Before the next spraying, add water to bring 
the solution up to these marks. This replaces the water lost by 
evaporation and gives a solution of known strength. 
If other than a 4-5-50 formula is given, take respective gallons 
as indicated in formula. For example, to make a 3-2-50 formula, 
take 3 gallous of stock solution of copper sulfate and put into 22 
gallons of water, and 2 gallons of stock solution of lime and put into 
23 gallons of water. Mix the two as before indicated. 
Preparation of Bordeaux Mixture With Addition of Resin-Fish-Oil 
Soap. 
1. Dissolve 2 pounds of resin-fish-oil soap in 2 gallons of 
water. 
2. Add only enough water to the slaked lime, before mixing, 
to make 23 gallons. 
3. After the copper sulfate and lime solutions have been 
mixed, add the 2 gallons of soap solution. 
4. Mix, strain, and spray as before indicated. 
CoMMERCTAT, IjME-SuLEUR SpRAY. 
Buy the commercial product from some reliable dealer and use 
as directed. 
Sele-Boieed Lime-Sui.eur Spray 8-8-50 Formula. 
M aterials — 
stone lime. 82 lbs. 
Flowers of sulfur. 32 lbs. 
Water to make. 200 gals. 
