THE AUTHORS 



RESEARCH SUMMARY 



VAL JO ANDERSON is an assistant professor in the 

 Botany and Range Science Department at Brigham 

 Young University in Provo, UT. 



ROBERT M. THOMPSON is tlie Forest range conserva- 

 tionist on the Manti-La Sal National Forest in Price, UT. 



ACKNOWLEDGMENTS 



We gratefully acknowledge the technical support of 

 the Shrubland Biology and Restoration Research Work 

 Unit of the Intermountain Research Station. We also 

 express appreciation to K. T. Harper, J. F. Vallentine, 

 S. B. Monsen, L. R. Robison, and L. S. Jeffery for con- 

 structive evaluation of an earlier draft of the manuscript. 

 The cover illustration was prepared by Kelly L. Memmott, 

 a wildlife and range student at Brigham Young Univer- 

 sity, Provo, UT. 



In the early 1980's, trials to control false hellebore 

 {Veratrum californicum Durand) were initiated on high- 

 elevation rangeland in central Utah. Five herbicides 

 (amitrole, picloram, glyphosate, triclopyr, and 2,4-D) and 

 three mechanical treatments (hand cutting, rototilling, 

 and disc chaining) were tested as potential control pro- 

 cedures for treatment of areas infested with false helle- 

 bore. Evaluations were conducted at 1 , 2, 4, and 9 years 

 after treatment. Stem density of false hellebore treated 

 with herbicides was reduced 40 to 75 percent by the sec- 

 ond year after treatment. Following this initial decrease, 

 stem densities increased through the ninth posttreatment 

 year. A single hand cutting appeared to weaken plants 

 the first 2 years after treatment, but baseline stem den- 

 sity increased 45 percent after 9 years. Rototilling, disc 

 chaining, and treatment with picloram provided the most 

 control of stem densities, reducing densities by 87, 48, 

 and 46 percent, respectively. Treatment with picloram 

 appeared to yield the best combination of false helle- 

 bore control and community recovery. 



Intermountain Research Station 

 324 25th Street 

 Ogden, UT 84401 



