The Maple Bark Louse. . 85 



any weak solution will destroy them. By experiment it 

 was found that White Hellebore when used in solution of 

 about one pound to twenty gallons of water would soon kill 

 them; a solution of tobacco and soap in water is also good. 

 These may be thrown upon the under surface of the leaves 

 with a fire extinguisher, or something similar. A kerosene 

 emulsion ought to be effective. 



Great care should be taken to avoid injuring the insect 

 enemies of the bark lice, but they are not likely to be injured 

 by weak solutions. The bark lice are very difficult to kill 

 when older and fixed to the branches. 



Trees to be transplanted should be thoroughly examined 

 and all traces of Bark-lice should be removed. 



The convention now adjourned sine die. 



