Downy brome (Bromus tectorum L.) and feral rye (Secale cereale) are competitive invasive winter annual grasses (IWAG). IWAG are considered one of the most problematic invasive species in rangeland and natural areas in the western United States. The currently recommended herbicides (imazapic and glyphosate) for site restoration have provided inconsistent control or cause injury to desirable perennial species. Indaziflam, a new herbicide alternative for weed management in natural areas and open spaces, provides long-term control of both downy brome and feral rye. Glyphosate can be mixed with a residual control product to control IWAG, while desirable perennials are dormant to achieve burndown of newly germinated seedlings. �Field trials were conducted to evaluate glyphosate dose to provide adequate first-year IWAG burndown, downy brome and feral rye control with residual herbicides indaziflam and imazapic, and subsequent native species establishment through drill seeding. Applications were made in March 2014 and treatments included increasing levels of glyphosate tank mixed with indaziflam (44, 73, 102 g?ai?ha-1) and imazapic (105 g?ai?ha-1). Sites were then drill seeded with native species 9 MAT. Yearly visual control evaluations, IWAG biomass, and stand counts of the drilled species were collected. Glyphosate at 170 g?ae?ha-1 provided the most consistent initial control of downy brome and feral rye. Plots treated with indaziflam at all 3 rates had significant native species establishment compared to the imazapic and control plots. Three YAT only treatments containing indaziflam at 44, 73 and 102 g?ai?ha-1 had significant IWAG control (91.3% � 7.2 - 99.5% � 1) compared to the check. These results provide valuable information for land managers trying to restore rangeland and natural areas severely impacted by IWAG and establish native species.
Oral presentation and poster titles, abstracts, and authors from the Society for Range Management (SRM) Annual Meetings and Tradeshows, from 2013 forward.