The complete eradication of the plant is usually prevented 

 by other food becoming available at this time. The vigor of the 

 balsam-root is materially affected and such injured plants bloom 

 poorly or in some cases not at all. In all the typical vegetation, 

 still present in the Palouse country, which has been held under 

 observation, fully eighty-five per cent of the balsam-root was 



found to be attacked in this manner. This shows a significant 

 tendency toward the elimination of one of the most characteris- 

 tic plants of the region and presents a problem that must be 

 met immediately to secure the perpetuation of the species. 



State College of Washington, 

 Pullman, Washington 



