Featured Article | GreenCast | Syngenta

Save summer lawns with post-emergent weed control in warm-season grasses

By Lane Tredway, technical services manager, Syngenta

During June and July, summer annual and perennial weeds grow larger and more objectionable, often requiring post-emergent herbicide applications during this time. Manuscript® and Monument® 75WG herbicides are powerful options for lawn care operators managing bermudagrass and zoysiagrass landscapes.

Manuscript controls tropical signalgrass, crabgrasses, dallisgrass and other labeled weeds in bermudagrass and zoysiagrass. It has a unique turf safety profile and control spectrum thanks to its phenylpyrazolin chemistry, and it includes a safener, cloquintocet-mexyl, to further enhance turf safety. Manuscript is packaged with Adigor™ surfactant, which was specifically designed to maximize Manuscript absorption and translocation in target weeds.

For best results, Manuscript can be applied:

  • With two spot treatment applications (9.6 fl. oz./10,000 ft.2) on a 14- to 21-day interval for consistent control of mature weeds, even in summer when other chemistries often struggle
  • In 40 gallons water per acre with 0.5% v/v of Adigor

Target weeds should be actively growing, and not under stress from drought or other factors, to maximize absorption and translocation of the active ingredient.

As with most grass herbicides, tank mixing Manuscript with sulfonylurea (SU) (Monument 75WG or metsulfuron-methyl) or synthetic auxin herbicides (2,4-D or clopyralid) are generally not recommended because of potential antagonism. Applications targeting sedges or broadleaves should be made separately at least seven days before or after Manuscript is applied.

Manuscript was applied to smooth crabgrass in Patriot bermudagrass at 9.6 fl. oz./10,000 ft.2 and mixed with Adigor at 0.5% v/v. Drive® XLR8 herbicide was applied at 64 fl. oz./A and mixed with methylated seed oil (MSO) at 0.5% v/v. Two- to three-tiller treatments were applied on June 26 and July 20, 2018. Five- to seven-tiller treatments were applied on July 5 and July 20, 2018. Source: Shawn Askew, Virginia Tech, 2018.
​​​​​​​

Monument 75WG is the standard for post-emergent control of major sedge species, including purple nutsedge, yellow nutsedge and green kyllinga. It also controls more than 30 grass and broadleaf weeds including clovers, spurges, Virginia buttonweed and most cool-season grasses.

As an SU herbicide, Monument 75WG inhibits new root and shoot growth in sensitive weeds, resulting in plant death after 14-21 days. The active ingredient is effectively translocated to the growing point and other below-ground structures to provide more effective control of tough perennial weeds compared to other SU herbicides.

With excellent turf safety to bermudagrass and zoysiagrass turf, Monument 75WG:

  • Can be applied as a broadcast or spot treatment at rates of 0.35 to 0.53 oz./A
  • Can be tank mixed with dicamba, fluroxypyr or other broadleaf weed herbicides to broaden weed control spectrum without reducing weed control
North Carolina State University, 2001

A program approach to weed control

​​​​​​​
Manuscript and Monument 75WG can be used together to control a variety of weeds within a program approach. After Manuscript applications, weeds like sedges and broadleaves tend to fill in. A follow-up application of Monument 75WG controls a broad spectrum of these weeds, and can reduce weed re-establishment so desirable turf can fill in without weed competition.


Manuscript causes little-to-no injury or growth regulation to bermudagrass or zoysiagrass when applied at broadcast or spot treatment rates.


For more information about warm-season weed control, download this lawn care brochure or contact your local Syngenta territory manager.
​​​​​​​

Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations. Trials reflect treatment rates commonly recommended in the marketplace.

©2019 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties and/or may have state-specific use requirements. Please check with your local extension service to ensure registration and proper use. Adigor™, GreenCast®, Manuscript®, Monument® and the Syngenta logo are trademarks of a Syngenta Group Company. All other trademarks are property of their respective owners.