> 



be concluded in such a manner as to make this clear 



Time to Work. 



Necessarily, insect control work cannot "be con- 

 ducted during the fire season. During the winter much time 

 would be lost by a crew, due to weather conditions. This 

 leaves only the fall after the fire danger is over, and the 

 spring from after the snow has melted to the beginning of 

 the fire season, about May 1. The emergence of the various 

 species of bark beetles also precludes wrork before October 

 1 or after May 1. These seasons are slightly varied, de- 

 pending upon the locality, climatic conditions and elevations 



The advisability of fall versus spring work can 

 often be judged by taking into consideration the following 

 facts : 



Fall Work Spring Work 



Disadvantages Disadvantages 



1. Trees are harder to spot. 1. Danger from fire gre c !: 

 (Many are still green.) 



2. Trees harder to peel. 2. Work may be cut short 



by dry hot weather, 

 causing the insects 

 to fly. 



* 



Advantages Advantages 



1. Danger from fire not great. 1. Trees more easily peel' 



-45- 



