The most damaging brown rots were Fomes pinicola and Polyporus 

 sulphureus . Of the white rots, Fomes pini , Armillaria me Ilea , Fomes 

 annosus, Poria wearii , and P. albipellucida were the most damaging. 



Figure 10. --(Left), Fomes pinicola on upper bole. Figure 11. --(Right) , 

 Scar on western hemlock from deep wound, and cross section from 

 40 feet above ground showing rot caused by Fomes pinicola enter- 

 ing through basal wound. 



Fomes pinicola caused 88 percent of the losses due to brown rot and 

 nearly three-fourths of the cull in Sitka spruce (figs. 10 and 11). 

 More than three-fourths of the cull in western redcedar was due to 

 incipient white rot- -a type of defect that may have a limited use in 

 both lumber and pulp manufacture. 



Kimmey's tables of defect on pages 22, 23, and 24 of Station Paper No. 6 

 show the percentage of the gross board foot and cubic foot volume that 

 is cull in trees from 11 to 78 inches d.b.h. Board foot figures are to 



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