Thesis
Control of rattail fescue (Vulpia myuros) in carbon-seeded Kentucky bluegrass and perennial ryegrass
Washington State University
Master of Science (MS), Washington State University
05/2020
DOI:
https://doi.org/10.7273/000004046
Handle:
https://hdl.handle.net/2376/124632
Abstract
Controlling winter germinating weeds in fall planted turf grasses grown for seed in the Pacific North West (PNW) has become a challenge due to the lack of labeled herbicides and herbicide resistance. Rattail fescue (Vulpia myuros) is a problematic weed for grass seed growers due to the lack of effective herbicide treatments during establishment of Kentucky bluegrass (Poa pratensis) and perennial ryegrass (Lolium perenne). Due to the increased cases of diuron resistance, new alternatives to diuron are needed for stand establishment. In an effort to find new alternatives to diuron, a root growth assay was performed to identify the variation in species response to indaziflam prior to evaluating indaziflam and pyroxasulfone for the management of V. myuros in carbon-seeded P. pratensis (cv 'Dauntless') and L. perenne (cv 'Pillar', 'Playfast', or 'Prominent') at the USDA Central Ferry Farm and Cook Agronomy Farm near Pullman, WA. Mesotrione was included as an industry standard. Treatments of indaziflam and pyroxasulfone were applied PRE at planting and POST to 3-leaf stage turfgrass. In these studies, carbon-seeded turfgrass varieties were successfully established when using indaziflam (7.3, 14.6 g ai ha-1) and pyroxasulfone (89, 179 g ai ha-1) applied PRE. Crop safety was achieved by spraying a 2.5 cm wide band of activated carbon over the row at the time of planting. Vulpia myuros was controlled at the Central Ferry site, and populations were reduced at the Pullman site. Lolium perenne varieties germinated rapidly, grew vigorously and were strong competitors to weeds within the row. Lolium perenne varieties also showed better weed control within the bands than the P. pratensis variety due to slower to germination and establishment. The Poa pratensis variety 'Dauntless' had a slow germination rate and was slower to establish, and thus appeared to be less competitive with weeds in the row. These results suggest that using activated carbon during early establishment of turfgrasses grown for seed appears to be a safe and effective weed control technique when using indaziflam and pyroxasulfone to control invasive grass species.
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Details
- Title
- Control of rattail fescue (Vulpia myuros) in carbon-seeded Kentucky bluegrass and perennial ryegrass
- Creators
- Raul Arroyo Rosas
- Contributors
- Ian Burke (Advisor) - Washington State University, Department of Crop and Soil Sciences
- Awarding Institution
- Washington State University
- Academic Unit
- Department of Crop and Soil Sciences
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Identifiers
- 99900890793301842
- Language
- English
- Resource Type
- Thesis