THE AUTHORS 



ALAN E. HARVEY, principal plant pathologist, is Pro- 

 ject Leader of the Silviculture of Cedar, Hemlock, 

 Grand Fir, and Douglas-fir Ecosystems and Forest Tree 

 Diseases of the Northern Rocky Mountains research 

 work unit at the Forestry Sciences Laboratory, 

 Moscow, ID. Dr. Harvey received a B.S. degree in biol- 

 ogy (1960), an M.S. degree in plant pathology (1962), a 

 Ph.D. degree in plant pathology (1968), and an aca- 

 demic year of postgraduate work in plant pathology 

 (1972). He joined the Intermountain Station in 1965. 



RUSSELL A. RYKER, principal silviculturist, is Project 

 Leader of the Ecology and Silviculture of Rocky Moun- 

 tain Douglas-fir and Ponderosa Pine Ecosystems 

 research work unit at the Forestry Sciences Labora- 

 tory, Boise, ID. He received B.S. and M.S. degrees in 

 forestry from the University of Missouri and conducted 

 research in the silviculture of hardwoods for the North 

 Central Experiment Station prior to joining the Inter- 

 mountain Station in 1963. 



MARTIN F. JURGENSEN, professor of forest soils, 

 teaches and conducts research in forest soils-soils 

 microbiology. He earned a B.S. degree in forestry 

 (1961), an M.S. degree in silviculture (1965), and a Ph.D. 

 degree in soil science (1967). He has held positions of 

 research associate and assistant professor at North 

 Carolina State University. He is currently with the 

 Department of Forestry, Michigan Technological 

 University, Houghton, Ml. 



RESEARCH SUMMARY 



Postseeding and postgermination treatments with 

 three weed control herbicides (Bifenox, DCPA, 

 Napropamide) at two rates of application caused little 

 reduction of ectomycorrhizal development on 1- and 

 2-year-old conifer seedlings in Central or Northern 

 Rocky Mountain nurseries. In many cases, herbicide 

 treatment increased ectomycorrhizal development, 

 particularly with DCPA. In general, herbicide treatment 

 effects on ectomycorrhizal development were species 

 and nursery specific. 



The use of trade, firm, or corporation names in ttiis 

 publication is for tl~ie information and convenience of 

 ttie reader. Sucti use does not constitute an official 

 endorsement or approval by the U.S. Department of 

 Agriculture of any product or service to the exclusion 

 of others which may be suitable. 



