78 COMMERCIAL ROSE CULTURE 



been known to entirely rid a house of these pests. Arsenate of 

 lead in about the same proportion (which must be kept well 

 stirred while being used) is sometimes used on large places, or 

 on any place where there is a steam pump and manure tank 

 these can be utilized to advantage for poison spraying, and a 

 large house may be covered very cheaply in this manner. For 

 catching the moths, a number of pie plates, filled with water, 

 may be distributed through a house. In the middle of these 

 set a lighted kerosene lamp. The flame will attract the moths; 

 they will then fall into the water and may be collected and de- 

 stroyed. The work will have to be kept up faithfully, as new 

 crops will hatch out and all cannot be killed at one operation. 

 Hydrocyanic acid gas has been tried without success, so far, for 

 this pest. 



