Bermudagrass Reseeding Intervals for Rimsulfuron, Simazine, and Sulfosulfuron

Abstract

<jats:p>Turf managers may wish to reseed common bermudagrass [<jats:italic>Cynodon dactylon</jats:italic> (L.) Pers.] following weed control with rimsulfuron, simazine, or sulfosulfuron applications, but establishment may be affected by herbicide residual activity. Field experiments were conducted in Georgia to investigate bermudagrass reseeding intervals for these herbicides. Application timing before seeding reduced bermudagrass establishment more than herbicide rate. By four weeks after seeding, bermudagrass cover was 15%, 53%, 81%, and 90% of the untreated from herbicides applied zero, two, four, or six weeks before seeding, respectively. Simazine at 2.24 kg a.i./ha reduced bermudagrass cover more frequently than sulfosulfuron at 0.035 and 0.07 kg a.i./ha and rimsulfuron at 0.02 kg a.i./ha. Results suggest that common bermudagrass may be safely reseeded four to six weeks after rimsulfuron, simazine, or sulfosulfuron treatments, but applications made closer to the seeding date have the potential to significantly delay establishment.</jats:p>

Sulfonylurea Herbicides' Fate in Soil: Dissipation, Mobility, and Other Processes

“…In analytical studies, metsulfuron and chlorsulfuron hydrolysis at pH 7 and 10 was slow (Berger and Wolfe 1996). Although this can be good for weed control, it can lead to increased injury to somewhat sensitive turfgrass species when trying to reestablish turf by seed (Lycan and Hart 2005;McCullough and Nutt 2010). Chemical degradation tends to be temperature-dependent for SUs with half-life (DT 50 ) decreasing with increasing temperature (Sarmah and Babadie 2002).…”

Perennial Ryegrass and Tall Fescue Reseeding Intervals after Aminocyclopyrachlor Application

“…However, these grasses were safely established when bispyribac sodium was applied 2 WBS (Lycan and Hart, 2006). Sulfosulfuron at 13 to 26 g/a.i./ha applied the day of seeding or 1 WBS reduced creeping bentgrass and kentucky bluegrass establishment compared with the non-treated control (McCullough and Nutt, 2010;Willis et al, 2007). Amicarbazone applied at 0.4 kgÁha -1 has the potential to reduce perennial ryegrass and tall fescue cover when applied the day of seeding.…”

“…Common bermudagrass [Cynodon dactylon (L.) Pers.] seedlings have shown significant injury and reduced establishment in response to rimsulfuron, simazine, and trifloxysulfuron applied 1 to 2 WBS (McCullough and Nutt, 2010;Willis et al, 2007). McCalla et al (2004) reported that 'Princess 77' bermudagrass seedlings exhibited 30% or less injury after applications of diclofop, metsulfuron, 2,4-D, dicamba, monosodium acid methanearsonate (MSMA), clopyralid, and quinclorac applied 1, 2, and 4 weeks after emergence.…”

Tall Fescue and Perennial Ryegrass Reseeding Intervals for Amicarbazone

“…Lycan and Hart (2006b) noted reductions in creeping bentgrass, kentucky bluegrass (Poa pratensis L.), and perennial ryegrass seedling cover from bispyribac-sodium applied 1 week before seeding (WBS), but these grasses were safely established when herbicides were applied 2 WBS. Common bermudagrass (Cynodon dactylon L.) seedlings have shown significant injury and reduced establishment from rimsulfuron, simazine, and trifloxysulfuron applied 1 to 2 WBS (McCullough and Nutt, 2010;Willis et al, 2007). Furthermore, researchers noted sulfosulfuron at 13 to 26 g/a.i./ha applied the day of seeding or 1 WBS significantly reduced creeping bentgrass and kentucky bluegrass establishment from the untreated.…”