INSECTICIDES AND FUNGICIDES vii 



To make the Bordeaux mixture, dilute each as much as 

 convenient before pouring them together. Pour the two 

 diluted solutions at the same time into a third vessel. Strain 

 it through a cloth before using it as a spray. Paris green or 

 arsenate of lead may be mixed with this to prevent diseases 

 and to poison insects at the same time, as on potatoes, toma- 

 toes, and fruit trees. 



7. Lime=Sulfur (chiefly to kill San Jose scale and pre- 

 vent disease). 



Old Formula (without salt) 



Powdered flowers of sulfur 15 pounds 



Burned ILne 15 to 20 pounds 



Water 50 gallons 



Wet the sulfur and slake the lime. Add these to 10 gal- 

 lons of boiling water. Boil for 40 to 60 minutes or until well 

 dissolved. Then water is added to make 50 gallons. This is 

 for winter use on orchards, and is used while warm. 



Concentrated Lime-Sulfur 



Powdered sulfur 30 pounds 



Burned lime 15 pounds 



Water 15 gallons 



Add the wet sulfur and the lime, after starting it to slaking, 

 to 15 gallons of boiling water, and boil until dissolved. This 

 may be kept in a closed vessel until wanted. A layer of oil 

 on the top of the liquid will keep away the air sufficiently. 

 This is diluted with about 9 times its volume of water for 

 winter use on apple trees. The rule for dilution requires 

 that the specific gravity of the liquid be found. Divide the 

 decimal part of this number by three hundredths (.03) and 

 the quotient will tell the number of times to dilute the liquid. 

 For example, if the specific gravity equals 1 . 27, divide . 27 

 by .03, giving 9. Then dilute the liquid with 9 times its 

 volume of water for winter use. As a summer spray on 

 apples and potato vines it should be diluted with 3 times as 

 much water as for winter use. 



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