Selective perennial ryegrass control in creeping bentgrass with flazasulfuron

Abstract

Lolium perenne L. (perennial ryegrass) commonly contaminates Agrostis stolonifera L. (creeping bentgrass) on cool-season golf courses. Currently, few herbicide options are available for the selective control of L. perenne in A. stolonifera. Previous studies have indicated that flazasulfuron could be a potential solution, so trials were conducted at three sites in Blacksburg, VA to evaluate flazasulfuron rates and sequential treatments for L. perenne control and A. stolonifera response. Flazasulfuron applied once at 8.8 g a.i. ha −1 ; twice at 1.1, 2.2, and 4.4 g a.i. ha −1 ; and three times at 1.1 and 2.2 g a.i. ha −1 completely controlled L. perenne by 5 weeks after initial treatment (WAIT). Sulfosulfuron and bispyribac-sodium controlled L. perenne 68 and 35% 5 WAIT, respectively. All flazasulfuron treatments eliminated L. perenne cover, sulfofulfuron reduced cover from 34 to 11% at one site, and bispyribac-sodium did not influence cover 9 WAIT. All treatments generally caused up to 10% A. stolonifera injury within one week of each treatment but only flazasulfuron at 4.4 g a.i. ha −1 and sulfosulfuron caused unacceptable and persistent injury. Flazasulfuron applied in sequence at rates of ≤2.2 g a.i. ha −1 causes mild and transient discoloration of A. stolonifera but completely controls L. perenne.

Species, cultivar and seeding rate effects on non‐irrigated, pesticide‐free athletic fields playing surface quality

“…Aggressive and repetitive overseeding has been recommended as an effective method of sustaining or improving turfgrass density (Goddard et al., 2009; Harper et al., 2016; Stier et al., 2008). Overseeding trafficked turfgrass can increase cover retention (Elford et al., 2008; Harper et al., 2016; Hoiberg et al., 2009; Miller & Henderson, 2012; Minner & Valverde, 2005; Minner et al., 2008) and reduce weed pressure (Elford et al., 2008; Goddard et al., 2009; Miller & Henderson, 2012; Minner & Valverde, 2005).…”

“…Aggressive and repetitive overseeding has been recommended as an effective method of sustaining or improving turfgrass density (Goddard et al., 2009; Harper et al., 2016; Stier et al., 2008). Overseeding trafficked turfgrass can increase cover retention (Elford et al., 2008; Harper et al., 2016; Hoiberg et al., 2009; Miller & Henderson, 2012; Minner & Valverde, 2005; Minner et al., 2008) and reduce weed pressure (Elford et al., 2008; Goddard et al., 2009; Miller & Henderson, 2012; Minner & Valverde, 2005). However, effective overseeding can depend on turfgrass species and cultivar selection, seeding rate, seeding frequency, irrigation requirements, and traffic tolerance (Elford et al., 2008; Harper et al., 2016; Larsen et al., 2004b; Larsen & Fischer, 2005; Stier & Koeritz, 2008).…”