12 BULLETIN 243, U. S. DEPARTMENT OF AGRICULTURE. 



will be found on the ground under the trees during this period and, 

 when the conditions seem to warrant it, burning may be done without 

 great expense. September, October, and November would be the 

 more favorable months for the work, as winter snow and unfavorable 

 conditions for burning will probably be found during the winter and 

 spring. 



Seed collectors in locating areas for collecting may estimate the 

 amount of cone-beetle damage on the trees by July 15 — in some situa- 

 tions a month sooner — as the blighted cones by that time begin to 

 stand out conspicuously on the trees. From these estimates the col- 

 lector may determine whether or not the seed crop of the current 

 year is too badly damaged to be profitably collected. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : 1915 



