48 
Colorado Experiment Station 
i6. Lime-Sulphur Wash 
This is the safest and most effective spray that can be used against 
the San Jose and other kindred scale insects. 
The old formula that is still quite generally used is: 
Lump Lime . 20 pounds 
Sulphur . 15 pounds 
Water. 50 gallons 
The lime is slaked with hot water in the kettle or cooking vessel, 
the sulphur is then stirred in and about one-half of the water added, 
then cooked from 50 to 60 minutes, or until the liquid becomes of a 
dark red color, when it is ready to dilute to 50 gallons, and use. Best 
results are obtained when it is applied while hot. 
17. Home-Made Concentrated Sulphur 
Fruit growers who have considerable lime sulphur spraying to do 
can make their own concentrated solution. This can be made and 
stored in tight barrels for future use, and if properly made and diluted 
according to the am.ount of sulphur it carries, it is just as effective 
as the commercial preparations. 
With the present prices of the commercial products the grower 
will find the home-made solution much cheaper, except for the orig¬ 
inal outlay for a cooking plant and storage barrels. 
In making this mixture the same methods are used as given above 
for making the dilute'solution, but the following formula is used:— 
Lump lime (pure). 40 pounds 
Sulphur . 80 pounds 
Water. 50 gallons 
Use only the best grade of pure lump lime. In boiling, never allow 
the water to get below 50 gallons, as this amount is required to rarr} 
the sulphur in solution. A mark showing the 50 gallon line should be 
made on the kettle or on the stirring paddle. If the mixture is to be 
stored for future use, strain into an air tight container and keep where 
it will be above the freezing point. 
Home-made concentrates are apt to vary more in strength or den¬ 
sity than the commercial brands. For this reason, each cooking 
should be tested and diluted according to the amount of sulphur in 
solution. This test is made by the Baume hydrometer, an instrument 
made for testing the density of liquids. 
The hydrometers are manufactured by the Bausch & Lomb Optical 
Company, Rochester, N. Y. 
The following table taken from Bulletin 330. New York Agricul¬ 
tural Experiment vStation will be found useful in making dilutions from 
the hydrometer readings. 
