35 



When concentrated lime-sulphur wash is used it should be diluted for use, when 

 there are no leaves on the trees, to 1 gallon of the concentrated wash to about 9 

 gallons of water, varying with the density of the wash. For use in summer the lime- 

 sulphur should be diluted to 1 gallon of the concentrated wash to 30 to 35 gallons of 

 water. A.rsenate of lead is the best poison to use with the lime-sulphur wash. 

 Arsenite of lime will injure foliage. 



Fungicides. 



Bordeaux Mixture — For fungi — 



Copper sulphate (bluestone) 4 lbs. 



Unslaked lime 4 lbs. 



Water (1 barrel) 40 gallons. 



Dissolve the copper sulphate (by suspending it in a wooden or earthen vessel 

 containing four or five or more gallons of water). Slake the lime in another vessel. 

 If the lime, when slaked, is lumpy or granular, it should be strained through 

 coarse sacking or a fine sieve. Pour the copper sulphate solution into a barrel, or it 

 may be dissolved in this in the first place; half fill the barrel with water; dilute the 

 slaked lime to half a barrel of water, and pour into the diluted copper sulphate solu- 

 tion, then stir thoroughly. It is then ready for use. (Never mix concentrated milk 

 of lime and copper solution.) 



A stock solution of copper sulphate and milk of lime may be prepared and kept 

 in separate covered barrels throughout the spraying season. The quantities of copper 

 sulphate, lime and water should be carefully noted. Bordeaux mixture deteriorates 

 with age and should be used as soon as made. 



To test Bordeaux mixture let a drop of ferrocyanide of potassium solution fall 

 into the mixture when ready. If the mixture turns reddish-brown add more milk of 

 lime until no change takes place. 



Poisoned Bordeaux Mixture — For fungi and leaf-eating insects. — To the 40 

 gallons of Bordeaux luixture prepared as above, add 4 to 8 ounces of Paris green, or 

 3 lbs. of arsenate of lead. 



