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.
United States Department of Agriculture, Forest Service, "Effects of Bifenox, DCPA, and Napropamide on Ectomycorrhizal Development of Conifer Seedlings in Central and Northern Rocky Mountain Nurseries" (1985). Forestry. Paper 45.