Creeping Bentgrass, Perennial Ryegrass, and Tall Fescue Tolerance to Topramezone During Establishment

Abstract

Topramezone controls weeds in tolerant, cool-season turfgrasses, but injury potential during establishment has received limited investigation. The objectives of this research were to evaluate the tolerance of ‘Penn A-4’ creeping bentgrass, ‘Manhattan V' perennial ryegrass, and ‘Titan' tall fescue to topramezone at 18.5, 37, or 74 g ae ha−1during establishment. Grasses were seeded in strips in October, and treatments were applied at 0, 2, 4, or 6 wk after seeding (WAS). Perennial ryegrass and tall fescue had minimal (≤ 8%) injury from all treatments, and ground cover was greater or equal to the nontreated at all application timings. Topramezone applied 4 WAS at 37 and 74 g ha−1injured creeping bentgrass 16 and 23% at 2 wk after treatment, respectively. However, all other topramezone rates and timings caused < 10% injury. Mesotrione at 175 g ai ha−1injured creeping bentgrass 14 to 43% at all timings and was more injurious than topramezone. Mesotrione applied at 2, 4, or 6 WAS controlled lesser swinecress ≥ 99% at 20 WAS, whereas applications on the day of seeding provided 71% control. All topramezone treatments provided poor control (< 70%) of lesser swinecress at 20 WAS. Overall, perennial ryegrass and tall fescue are tolerant to topramezone during establishment at the rates tested. Seedling creeping bentgrass has better tolerance to topramezone from 18.5 to 74 g ha−1, than to mesotrione at 175 g ha−1and may provide end-users an HPPD inhibitor for use during establishment.

Annual Bluegrass Control during Hybrid Bluegrass Establishment from Sprigs

“…Hybrid bluegrass is tolerant to 4‐hydroxyhenyl‐pyruvatedioxygenase inhibiting herbicides mesotrione and topramezone. The tolerance to these herbicides was similar to previous research on newly seeded or sprigged Kentucky bluegrass, perennial ryegrass ( Lolium perenne L.), and tall fescue (Dernoeden et al, 2008; Reicher et al, 2011; Jones and Christians, 2007; Johnston et al, 2016; McElroy et al, 2007). McElroy et al (2007) noted that hybrid bluegrass is tolerant to multiple applications of mesotrione when initially treated at 2 wk after seeding.…”

Herbicide tolerance in 11 grass species for minimal‐to‐no‐mow golf course rough

“…Depending on site and environmental conditions, these minimal‐to‐no‐mow areas may become infested over time with invasive weeds, especially graminoids, which will negatively affect both the aesthetic and functional properties of these areas. Although there are many recommended grass species for these areas (Christians et al., 2017; Tallarico & Voigt, 2004; Voigt, 2007), there have been few studies that have investigated over‐the‐top applications of graminicides for selective postemergence control (Johnston et al., 2016; Marble et al., 2018). Therefore, the safety of postemergence graminicides on multiple grass species for minimal‐to‐no‐mow areas requires further evaluation to help educate turf managers on potential weed control options and promote the potential for greater biodiversity of grass species in minimal‐to‐no‐mow areas.…”

Weed Detection in Perennial Ryegrass With Deep Learning Convolutional Neural Network

“…These weed species are commonly found in various cool-season turfgrasses. Herbicides, such as 2,4-D, dicamba, MCPP, triclopyr, and sulfentrazone are broadcast-applied in cool-season turfgrasses for POST control of various broadleaf weeds (McElroy and Martins, 2013; Reed et al, 2013; Johnston et al, 2016; Yu and McCullough, 2016a; Yu and McCullough, 2016b). Precision herbicide application using machine-vision based sprayers will substantially reduce herbicide input and weed control costs.…”