THE AUTHOR 



PHILIP C. JOHNSON, Principal Entomologist and Research Project Leader stationed 

 at the Forestry Sciences Laboratory in Missoula, Montana, retired in July 1969. 

 He received his B.S. degree in Forestry and an M.S. degree in Entomology from 

 Oregon State University. He joined the staff of the former Bureau of Entomology 

 and Plant Quarantine in 1931 and was assigned to forest insect laboratories at 

 Berkeley, California, and Coeur d'Alene, Idaho, prior to his transfer to the 

 Intermountain Station in 1953. 



For dedication of land and timber to the study and for assistance in establishing 

 plots, the author expresses his gratitude and thanks to Messrs. George F. Neils, 

 Manager of Logging (retired), Mark J. Schoknecht, General Manager, and Richard 

 D, Griffith, Chief Forester, Libby Operation, St. Regis Paper Company, Libby, 

 Montana; Messrs. George Neff, Production Manager, Ernest B. Corrick, Forestry 

 and Loggii^ Manager, and A. J. G. (Ernie) McCrae, Logging Engineer (deceased). 

 Anaconda Forest Products, Bonner, Montana; Mr. O. B. Calvin, Vice President, 

 Glacier Park Company, Somers, Montana; and the Forest Supervisors and staffs of 

 the Bitterroot National Forest, Hamilton, Montana, the Helena National Forest, 

 Helena, Montana, the Kootenai National Forest, Libby, Montana, and the Lolo Na- 

 tional Forest, Missoula, Montana. The author also expresses his appreciation to 

 Messrs. Ellsworth M. Richlen, Chief, and Ronald C. McConnell, Soils Scientist, 

 Soils Management Branch, Division of Soils and Watershed Management, Northern 

 Region, USDA Forest Service, Missoula, Montana, for undertaking and reporting the 

 classification of soils on some of the plots used in the study; and to Messrs. Ross 

 Williams, Dean Emeritus, and John S. Spencer, Jr. , a former graduate student. 

 School of Forestry, University of Montana, Missoula, for their cooperation in 

 determining the growth rates of risk-rated ponderosa pine trees. 



COVER 



Photograph taken on a study plot in the Piquett Creek 

 Experimental Area, Bitterroot National Forest, Montana, 

 shews a mature ponderosa pine forest; in the background 

 is Boulder Feck, elevation 9,650 feet. 



