SPRAY MATERIALS 141 



fume, are very good. These materials are made from tobacco 

 and are in a very concentrated form. They are usually pre- 

 pared by diluting the stock solution with 800 to 1000 parts 

 of water. 



Tobacco decoction is also used to some extent as an 

 insecticide. This spray is made by boiling 1 pound of tobacco 

 stems in about a gallon of water for one hour. Strain out the 

 refuse material and add enough water to make two gallons. 

 The tobacco products are excellent for controlling the plant 

 lice, and they do no injury to the most tender plants. 



KEROSENE EMULSION. 



Laundry soap . . § pound 



Kerosene 2 gallons 



Water . . 1 gallon 



Kerosene emulsion is made by dissolving the soap by 

 boiling it in the full amount of water. Remove the mixture 

 from the fire and add the kerosene. Stir the mixture violently 

 for about fifteen minutes until it becomes a creamy mass that 

 will not separate. This is the stock solution. For use dilute 

 1 part of the emulsion with 8 to 10 parts of water for hard- 

 bodied insects, and 1 part with 12 to 20 parts of water for 

 soft-bodied insects. 



CARBOLIC ACID EMULSION. 



Hard soap .... . . 1 pound 



Crude carbolic acid 1 pint 



Hot water 1 gallon 



Dissolve the soap in the hot water and add the carbolic 

 acid. Churn the mixture until it becomes creamy and does 

 not separate. This is the stock solution. For use dilute 

 1 part of the emulsion to 30 parts of water. This spray is 

 used against the different kinds of maggots, the cabbage 

 worms, and other soft-bodied insects. 



Sprays for Plant Diseases. — The spray mixtures for the 

 control of plant diseases differ from those used to kill insects. 

 The confusion which results over this question is oftentimes 

 detrimental to the growers. 



