Harvey, Alan E.; Ryker, Russell A.; Jurgensen, Martin F. Effects of Bifenox, 

 DCPA, and Napropamide on ectonnycorrhizal developnnent of conifer seedlings 

 in Central and Northern Rocky Mountain Nurseries. Research Paper INT-341. 

 Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Re- 

 search Station; 1985. 7 p. 



Postseeding and postgernnination treatments with three weed control herbi- 

 cides (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 spe- 

 cies and nursery specific. 



KEYWORDS: weed control, herbicide, ectomycorrhizae, Modown, Dacthal, 



Devrinol, toxicity, nursery practice 



PESTICIDE PRECAUTIONARY STATEMENT 



This publication reports research involving pesticides. It 

 does not contain recommendations for their use, nor 

 does it imply that the uses discussed here have been 

 registered. All uses of pesticides must be registered by 

 appropriate State and/or Federal agencies before they 

 can be recommended. 



CAUTION: Pesticides can be injurious to humans, 

 domestic animals, desirable plants, and fish or other 

 wildlife— if they are not handled or applied properly. 

 Use all pesticides selectively and carefully. Follow 

 recommended practices for the disposal of surplus 

 pesticides and pesticide containers. 



POU.QW THC L^BBI. 



V.i. tirAtT>ilir » ACIICUITUIC 



