314 PRINCIPLES OF SPRAYING 



Shave up the soap in the water while boiling hot. As soon as the 

 soap is all dissolved remove from the fire and mix it with the two 

 gallons of kerosene. Shake this mixture thoroughly for fifteen 

 minutes. If you have a bucket pump use that in mixing, by spray- 

 ing back into the same vessel. This soap solution may be kept in 

 large bottles for use at any time. It should be shaken again each 

 time before using. 



Fig. 219. — A melon leaf badly infested with plant lice. Spray with nicotine sulfate one part 

 to 300 parts or 600 parts of water. (Illinois Station.) 



On dormant trees and shrubs use one part of the soap solution to 

 about seven parts of water. On plants in full leaf for plant lice, 

 dilute it, using one part to about fifteen parts of water. Always 

 make a trial to see if the plants are being injured, and also to see if 

 the insects are being killed. 



Crude Oil Emulsions. — The directions for making crude oil 

 emulsions are practically the same as for making kerosene emulsion. 

 The danger to plants is less than with the kerosene emulsion, 



