Trees and Timber 



385 



phore, formed in the cavities under dead branches, is from 

 0.5-35 cm. in length by 1 cm. wide. The pore-bearing layer 

 is flesh-colored. 



This and the preceding disease of the cedar taken together 

 have been estimated to cause 60 per cent loss in some local- 



Fici. 202. 



Longitudinal section of cedar showing effect of Fomes 

 juniperinus. After von Schrenk. 



ities. Since they are caused by wound parasites, the removal 

 of diseased trees and the destruction of sporophores is 

 recommended. 



Cedar canker (Phoma sp.). — This canker is found on 

 juniper and arbor-vitse. Injury apparently occurs only on 

 trees under four years old. Prior to that age entire seed beds 

 may be destroyed. 



