FOREST PROTECTION. 



135 



a raised platform on the wagon, and to attach the hose 

 nozzle to the end of a long bamboo pole. In most prairie 

 groves, this is practicable, but mth very high trees it 

 is very difficult, if not entirely impracticable. For most 

 leaf-eating insects, Paris green is best apphed in water at 

 the rate of one pound of poison to 150 gallons of water. 

 When used dry, mix with cheap flour at the rate of one 

 pound of poison to thirty pounds of flour or one pound 

 of Paris green to 100 pounds of air-slaked Hme. 



For Sucking Insects, such as plant lice and Box-elder 

 bugs, Paris green is worthless, and the remedies used 



Fig. 47. — White Willow windbreak seriously injured by successive 

 attacks of saw-fly larvae. 



must be those that will kill by contact, such as tobacco 

 water made the color of strong tea, whale-oil soap, 

 and kerosene emulsion. In the case of small trees that 

 can be easily enclosed in a tent the best remedy is to- 

 bacco smoke. 



Borers Cause much loss in forests by tunnelling through 

 the wood. They generally prefer trees that are some- 



