14 



Oklahoma Agricultural Experiment Station 



4 



Figure 6 Leaf showing nymphs and adults killed by the kerosene emulsion spray 

 (H. R. Painter) 



tion to 5 2-3 parts water and applied to the under surfaces of the 

 leaves. 



The results were quite favorable in most applications, accom- 

 plishing the destruction of, all the young, and from 80% to 90% 

 of the adults. However, in a few instances the foliage of some 

 of the trees was burned slightly, indicating that a stronger solu- 

 tion would not be safe. This strength should not be used except 

 on bright, sunshiny days when there is a slight breeze in order to 

 volatilize the excess oil and prevent severe burning of the leaves, 

 otherwise there may be great injury to 'the foliage, and if used at 

 a weaker strength it is not effective enough for the adults to war- 

 rant its use in this case. 



