Fungous Diseases oe Colorado Crop Plants 
51 
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Preparation — 
4-5-50 Formula From Fresh Material. 
1. Dissolve 4 pounds copper sulfate in hot v^ater, place in half 
barrel and add water to make 25 gallons. 
2. Slake 5 pounds of stone lime in the second half barrel and 
add water to make 25 gallons. 
3. Mix solutions by having two operators, each provided with 
a bucket, dip up equal amounts of the copper sulfate and lime solu¬ 
tions, respectively, and pour them together at the same rate at a 
height of two or three feet above a mixing barrel (Plate XIX). 
Plate XIX. Showing method of mixing copper sulfate and lime solutions in preparation 
of Bordeaux spray mixture. 
4. Mix the whole thoroughly by stirring vigorously. 
5. Strain the mixture when putting into the spray tank. 
6. Apply to the plants with any good pressure spray pump. 
Use as soon as made. 
If other than a 4-5-50 formula is given, take respective pounds 
as indicated in formula. For example, to make a 3-2-50 formula, 
take 3 pounds of copper sulfate and dissolve in 22 gallons of water, 
and 2 pounds of lime and slake and add to 23 gallons of water. Mix 
the two as before indicated. 
