Weed Control and Turf Safety of Single and Sequential Applications of Herbicides Over Spring Seedings

Abstract

Weed control is important during establishment of cool‐season grasses, especially when seeded in spring near summer annual weed germination. Our objectives were to determine (i) turf safety and weed control from sequential applications of newly‐released herbicides on tall fescue at three seeding dates (May, June, July) and (ii) turf safety and weed control from newly‐released herbicides applied at seeding or shortly after emergence of spring‐seeded Kentucky bluegrass or tall fescue. No herbicides tested negatively affected turfgrass establishment and usually improved turf establishment by reducing weed competition. Mesotrione consistently provided effective weed control and turf cover from either single or sequential applications over different locations, years, seeding dates, and turf species. Quinclorac or siduron applied as single or sequential applications or quinclorac+carfentrazone as a single application provided effective weed control and turf cover depending on seeding date and application regime. Although spring seeding can be achieved with high maintenance, it is strongly recommended to seed cool season grasses at the optimal time from late summer to early fall.

Kentucky Bluegrass: Perennial Ryegrass Seeding Ratios and Post-Seeding Herbicides Affect Species Composition of Fairways

“…Ethofumesate is recommended to be applied no earlier than 1 to 2 weeks after emergence of PRG and 8 weeks after emergence of KBG, whereas mesotrione is recommended to be applied no earlier than 4 weeks after emergence of either KBG or PRG (Syngenta Crop Protection, 2011; Bayer Environmental Science, 2012). Our results are similar to other research showing that even though herbicides applied shortly after seedling emergence may cause limited damage, cool‐season turfgrass quickly recovers with the lack of weed pressure (Sousek et al, 2014; Rutledge et al, 2009; Reicher et al, 1999, 2000).…”

Hydroseeding with mesotrione in tankmix for establishment of perennial ryegrass

“…Agronomy Journal © 2020 American Society of Agronomy seeding and on established turfgrass for many species (Blume & Christians, 2009;Giese, Keese, Christians, & Gaussoin, 2005;McCurdy, McElroy, & Breeden, 2009;McElroy, Breeden, & Sorochan, 2007;Syngenta Crop Protection, 2011). It is advantageous to control weeds before turfgrass germination, allowing more resources to be directed towards the maturing desired turf stand (Sousek, Gaussoin, Patton, Weisenberger, & Reicher, 2014). Mesotrione has long been used as an herbicide in corn (Zea mays L.) (Mitchell et al, 2001) and is now being used in turfgrass management to control unwanted creeping bentgrass (Agrostis stolonifera L.) (Beam, Barker, & Askew, 2006;Branham, Sharp, Kohler, Fermanian, & Voigt, 2005;Dernoeden, Kaminski, & Fu, Agronomy Journal.…”

“…Mesotrione (2‐[4‐(methylsulfonyl)‐2‐nitrobenzoyl]‐1,3‐cyclohexanedione, sold as “Tenacity”) is an effective preemergence and postemergence herbicide that controls common turfgrass weeds and is labeled for use both during seeding and on established turfgrass for many species (Blume & Christians, 2009; Giese, Keese, Christians, & Gaussoin, 2005; McCurdy, McElroy, & Breeden, 2009; McElroy, Breeden, & Sorochan, 2007; Syngenta Crop Protection, 2011). It is advantageous to control weeds before turfgrass germination, allowing more resources to be directed towards the maturing desired turf stand (Sousek, Gaussoin, Patton, Weisenberger, & Reicher, 2014). Mesotrione has long been used as an herbicide in corn ( Zea mays L.) (Mitchell et al., 2001) and is now being used in turfgrass management to control unwanted creeping bentgrass ( Agrostis stolonifera L.) (Beam, Barker, & Askew, 2006; Branham, Sharp, Kohler, Fermanian, & Voigt, 2005; Dernoeden, Kaminski, & Fu, 2008; Golob, Johnston, Proctor, & Williams, 2013; Jones & Christians, 2007), annual bluegrass ( Poa annua L.; Elmore, Brosnan, & Kopsell, 2013; Reicher, Sousek, & Giese, 2017; Reicher, Weisenberger, Morton, Branham, & Sharp, 2011) and other weeds (Beck et al., 2015; Brewer, Willis, Rana, & Askew, 2017; Brosnan, Breeden, & Elmore, 2010a, 2010b).…”