ABSTRACT 



Methods of topping overmature bitterbrush shrubs and the 

 subsequent effect on annual twig growth were studied on three 

 widely separated deer winter ranges. Annual twig growth increased 

 considerably following topping, then gradually decreased, al- 

 though it remained greater than on untopped shrubs during the 4 

 years of study. No detrimental effects on shrub longevity, nor in- 

 crease in damage from insect attack or disease were observed. 

 Chain saws were more efficient than hand tools for topping. Using 

 chain saws, an efficient crew should be able to top a stand of bit- 

 terbrush, similar in density to those described, for $9.00 to $21.00 

 per acre. 



