THE WHITE-PIXK \VKK\IL 



201 



Fifteen hundred trees per acre would be much safer, and it is possible 

 that the added stimulus to height growth would cover the difference 

 in the cost of planting. In the East, however, where the infestation is 



woo 



1S00 

 1400 

 1300 

 1200 

 1100 



M 



oe 

 o 

 < 1000 



a 



a. 900 



«t 



u 



s; 800 



700 

 600 

 SOO 

 400 

 300 



PERCENT UNMERCHANTABLE PER ACRE 



Fic. 6.— Decrease in tlic per cent of unmerchantable trees, resulting from weevil injury, with 



increasing density 



much heavier, plantings should be made somewhat closer for best re- 

 sults. Planting 4 feet by 5 feet should be perfectly safe. 



There are certain controlling agencies which can never be depended 

 on for the complete C(Mitrol <>f the weevil. i)ul whicli aiv present over 



