FOREST DISEASE SURVEYS. e 
writer has tested and proved this assertion in practice while employed 
by the Forest Service on the Big Hole timber survey made in 1914 
in the Deerlodge Na- 
tional Forest of 
Montana. From the 
data thus collected 
pathological maps 
were made, giving 
in colors the areas 
of the stand in- 
fected, respectively, 
with the pine rust 
(Cronartium coleo- 
sporioides (D. and 
H.) Arthur), both 
gall and blister 
am, oe Fic. 7.—Fomes pinicola, the red-belt Fomes growing on 
(Razoumofskya grand fir. 
americana (Nutt.) : 
Kuntze), heart-rots (Trametes pint (Brot.) Fr. and Polyporus 
schweinitzti Fr.), and various other diseases (fig. 1). Careful notes 
BSRUHOs Se 
i! SIM LaW 
{ 
[2 W3LSAS 
va pera ey aye 
EE 
| 
1S v 
filise ahr 
Fic. 8.—Typical rot of the red-belt Fomes in grand fir; cross and tangential sections. 
Note the strands of white felty masses (mycelium) throughout the rotted areas. 
were taken as to the percentage of infection in each case, and a closer 
estimate of the amount of cull was made possible. In one particular 
cee 
