106 GENERAL CONSIDERATIONS 



slum sulphide in solution as a remedy against mites 

 and powdery mildews. Formulas for these different 

 sprays are as follows: — 



Paris Green. — Use 4 ounces to 50 gallons of water or 

 of Bordeaux mixture. Keep constantly agitated. Two 

 pounds of flour boiled to a paste may be added to the 

 water when used alone. Limewater used with Paris 

 green prevents burning of foliage. To apply as powder, 

 mix with 20 to 30 parts of flour, slacked lime, or finely 

 sifted wood ashes. 



London Purple. — Use the same as Paris green. Its 

 composition is variable and its use not always satisfac- 

 tory. 



Arsenite of Lime. — Boil 1 pound of white arsenic in 

 4 quarts of water. Use this to slack 2 pounds good quick- 

 lime. Add water to make 2 gallons as stock mixture. 

 Por use add 1 quart to each barrel of water or Bordeaux 

 mixture. 



Arsenate of Lead. — Add 1 to 2 pounds to 50 gallons of 

 water or Bordeaux. It burns foliage less than Paris green. 



Kerosene Emulsion. — Boil i pound laundry soap in 1 

 gallon soft water. While hot, add 2 gallons kerosene and 

 churn violently 5 to 10 minutes. Dilute with 4 to 20 

 parts of water before using. (Strong emulsions are for 

 scale insects in winter.) 



Kerosene in Mechanical Mixture. — Use special pump. 

 Set to throw 5 per cent to 25 per cent of kerosene. 



Crude Petroleum. — Use same as kerosene. 



Whale-oil Soap. — Use 12 to 15 pounds of the potash 

 soap for each 50 gallons of water. 



Resin Mixture. — Boil 20 pounds resin, 5 pounds caustic 

 soda, and 3 pints fish oil with 20 gallons of water for at 

 least 3 hours. Add hot water to make 50 gallons. Use 

 in winter. For use on foliage dilute to 150 gallons. 



