FOREST DISKASE SURVEYS. 



15 



found in a certain age class, a certain site (slope and bottom) for a 

 given tree species for 





r 





* 



mm 



nrn|! . 



METRIC ''SYSTEM 



fei,ifciK~.j^ 



'/i*,. ':!.'*.,. -4U... *-**- 



mi 



f[f]TlJ!ll!| 



Fig. 16. — Typical rot of the root Fomes in grand fir. 

 the black dots in the white areas. 



Note 



a given kind of rot, 

 and would be com- 

 piled from intensive 

 field studies made 

 upon felled trees. It 

 would properly be 

 termed a "table of 

 rot percentages " and 

 would be used by 

 the estimator of each 

 unit crew to deter- 

 mine the rot percent- 

 ages for each type of 

 forest encountered. 

 Further deductions 

 for other defects 

 could then be esti- 

 mated and' the total 

 cull percentage se- 

 cured by the addition 

 of the rot percent- 

 age. In conjunction 

 therewith, another 

 table giving (1) the 

 class of defect, (2) 

 common name of the 

 defect, (3) the fun- 

 gus causing it. (4) 

 the various tree spe- 

 cies affected. (5) the 

 general external and 

 internal characteris- 

 tics of the defects, 



and (6) the average 



extent of the rots 

 and the general form 



of the rot within the 



tree would be of 



great service to the 



estimator. Such a 



table prepared from 



field data secured during the past three seasons is here submitted. 



(Table I; figs. 2 to 23.) 



FlG i7. — piioliota adiposa, the scaly Fholiota. 

 Freeman.) 



(After 



