Integrated management of cheat (Bromus secalinus L.) and downy brome (Bromus tectorum L.) in Oklahoma grain-only winter wheat

• DOI: 10.1017/wet.2024.26
• Publication Date: 2024-05-16T06:40:25Z
• Authors: Hannah C. Lindell; Misha R. Manuchehri; Emi Kimura; Todd A. Baughman; Nicholas T. Basinger
• Keywords: Bromus tectorum; Bromus

Abstract In Oklahoma, downy brome and cheat are difficult-to-control winter annual grasses. the past, infested most of wheat hectares harvested in Oklahoma. Biotypes that cross-resistant to acetolactate synthase–inhibiting herbicides have left growers with minimal management options for conventional herbicide-tolerant systems. Field trials near Lahoma, 2019–2020 2020–2021 evaluated integrated using three strategies: planting date (optimal, delayed, late), cultivar selection (high low competitiveness), herbicide choice (no herbicide, sulfosulfuron at 35.2 g ai ha −1 pyroxsulam 18.4 ). Visual control, weed species present, biomass heading, grain yield data were collected. 2019–2020, 8 9 wk after treatment, visual control increased by 15% delayed compared optimal 14% late date. 2020–2021, similar (∼99%) was recorded plantings 23% greater than timing. Due a lack coverage, had no response date, cultivar, or treatment. Downy during approximately 90% lower dates same year, (≤0.4 0.2 m −2 ) 98% less an application nontreated area. Wheat yields from 2019–2020. A delay timings decreased 21%, respectively. reduced 57% yield. Delaying use common can suppress brome, but decline may occur.