ORCHARD AND GARDEN. 61 



Formulae for Insecticides. 



L— BORDEAUX MIXTURE— 



Copper Sulphate (Bluestone) 4 lbs. 



Unslaked Lime 4 lbs. 



Water 40 gals. 



Dissolve the copper sulphate in a wooden or brass vessel with hot water, 

 pour into a barrel and add cold water to make 20 gals.; slake the lime 

 preferably with hot water; add cold water to make 20 gals.; stir both 

 barrels well, and pour lime into the copper sulohate barrel. (Never 

 mix concentrated milk of lime and copper sulphate solutions.) 



A stock solution of each may be made and kept indefinitely if not mixed. 

 Dissolve 40 lbs. copper sulphate in 40 gals, of water by suspending 

 just below the surface of the water in a coarse sack. Each gallon of 

 the liquid will now contain 1 lb. copper sulphate. Slake any desired 

 quantity of lime and put into a box or barrel in shaded place, or sunk 

 in the ground. Keep covered with small amount of water to exclude 

 the air. Calculate how much is required for 4 lbs. lime if well stirred. 



To test Bordeaux mixture, let a drop of ferro-cyanide of potassium 

 solution fall into a little of the mixture in a saucer, when ready. If this 

 causes it to turn reddish brown, add more lime until no change takes 

 place. 



II.— LIME-SULPHUR WASH. 



1. — HOME-BOILED (for use on dormant wood only.) 



Fresh stone lime 20 lbs. 



Sulphur (flour or flowers) 15 lbs. 



Water 40 gals. 



Slake 20 lbs. of lime in about 15 gals, boiling water in a kettle or other 

 boiling outfit. While slaking add the 15 lbs. sulphur made into paste 

 by the addition of a little water. Boil vigorously, with stirring, for 1 

 hour. Dilute to 40 gals, with cold or hot water. Strain and apply 

 at once. 



HOMEMADE CONCENTRATED LIME-SULPHUR.— This may be 

 used as a substitute for commercial lime-sulphur, but is only about 

 two-thirds as strong as a rule. 



Sulphur (a fine grade) 100 lbs. 



Fresh stone lime, high in percentage of calcium. . 50 lbs. 



Water 40 or 50 gals. 



Put about 10 gals, of water in the boiling outfit, start fire, add sulphur, 

 stir to make paste and break lumps, then add remaining water, and 

 when near boiling put in lime. Stir frequently while slaking and till 

 all the sulphur and lime are dissolved. Add water from time to time 

 to keep up to 40 or 50 gal. mark. Boil 1 hour, then strain through 

 a screen of 30 meshes to inch to storage barrels. Make enough at once 

 for season's work. Cover well to keep out air, or pour oil of any kind 

 over surface to depth of one-eighth inch for same purpose. 

 3. — SELF-BOILED (chiefly for use on peach foliage). 



Freshstone lime 8 lbs. 



Sulphur (flour or flowers) 8 lbs. 



Water 40 gals. 



