22 



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 



Fig. 22. — Cronartium 

 colcosporioides, pine 

 rust, blister form, 

 on 2-year-old seed- 

 lings of yellow pine. 



Fig. 23. — Cronartium coleosporioides, pine rust, blister 

 form, an old infection, on the main trunk of lodge- 

 pole pine, known locally as "hip canker" or "cat- 

 face." 



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. 



