25 BULLETIN 658, U. S. DEPARTMENT OF AGRICULTURE. 
The maps will be found valuable not only as an interpretation of 
the data taken in intensive disease surveys in connection with timber 
surveys but in the appraisal, marking, and general administration of 
the sale area. With regard to appraisal the map will indicate the 
location of seriously infected areas and also the rot percentages. 
With respect to marking, the map will show the exact area of the 
Fic. 22.— Cronartium Fig. 23.—Cronartium coleosporioides, pine rust, blister 
coleosporioides, pine form, an old infection, on the main trunk of lodge- 
rust, blister form, _ pole pine, known locally as ‘“‘ hip canker” or ‘‘ cat- 
on 2-year-old seed- face.” 
lings of yellow pine. 
most seriously infected trees and aid in the exclusion of infected 
trees for seed trees. From the standpoint of general administration, 
the maps will show the location of sites and age classes upon which | 
heavier marking must be employed in order to conform with the most 
| effective sanitation clauses. 
| With regard to reforestation by artificial or natural means, these 
| maps will show the proximity of infected stands and whether or not 
the site has been or apparently is favorable to excessive disease. 
