Weed Suppressive Soil Bacteria to Reduce Cheatgrass and Improve Roadside Vegetation Diversity on ITD Rights-of-Way

The major goal is to obtain the data needed to develop best management practices that incorporate weed-suppressive bacteria into vegetation management programs and to successfully reduce cheatgrass and medusahead populations and re-establish native populations. This will be accomplished by demonstrating and evaluating the effect of the new and innovative technology using the bacterium, Pseudomonas fluorescens strain ACK55 (P.f.ACK55), on cheatgrass growth across two years at locations on the I-84, I-86 and US-95 highway systems in Idaho. These large-scale field trials will reduce the competitiveness of cheatgrass and increase vegetation diversity. The relative success of the bacteria on cheatgrass populations, on native plant establishment and the success of the bacteria at research sites will be incorporated into an integrated vegetation management plan for Idaho Department of Transportation (ITD) or other Department of Transportation (DOT) programs.