How to Use Vexis Herbicide Granular (and More FAQs)

Featuring the proprietary active ingredient, pyrimisulfan, Vexis Herbicide Granular is a selective, post-emergent herbicide that delivers exceptional control of sedge and kyllinga species, plus listed broadleaf weeds. The granular formulation reduces the potential for drift or off-target application and can be applied to wet or dry turf. Vexis is ideal for use on golf course tees, fairways, and roughs and is labeled for use on listed cool-season and established warm-season turfgrasses, including improved varieties of St. Augustinegrass.

How to Use Vexis

Frequently Asked Questions

What is the class chemistry for Vexis?

Vexis, the trade name for pyrimisulfan, is in the sulfonanilide chemical class.

Photo: Vexis

What is the mode of action for Vexis?

Vexis is an ALS inhibitor. It inhibits acetolactate synthase, the enzyme common to the biosynthesis of the branch-chain amino acids. Research has shown, however, that Vexis may have activity against weeds that have developed resistance to other ALS-inhibiting herbicides, such as sulfonylureas (SU’s).

What resistance management groups does Vexis belong to?

Vexis is in Weed Science Society of America (WSSA) Group 2 and Herbicide Resistance Action Committee (HRAC) B class ALS inhibitors.

Is Vexis a phenoxy product?

No, Vexis is a non-phenoxy, low-rate herbicide.

What weeds does Vexis control?

Sedges, Kyllingas, and Rushes:

• Yellow nutsedge
• Purple nutsedge
• Annual sedges (including ALS-resistant sedges)
• Cockscomb kyllinga
• Green kyllinga
• False green kyllinga
• Path rush

Broadleaf Weeds:

• Buckhorn plantain
• Common chickweed
• Dollarweed (pennywort)
• False dandelion
• Florida betony
• Ground ivy
• Hairy bittercress
• Henbit
• Virginia buttonweed

What turfgrass species is Vexis labeled for use on?

Warm-Season Turfgrasses:

• Bermudagrass (common or hybrid)
• Bahiagrass
• Buffalograss
• Centipedegrass
• Kikuyugrass
• Seashore paspalum
• St. Augustinegrass (including improved varieties, such as floratam and bitterblue)
• Zoysiagrass

Cool-Season Turfgrasses:

• Bentgrass (mowed over ½ inch)
• Fine and tall fescues
• Kentucky bluegrass
• Perennial ryegrass

Where can Vexis be applied?

• Golf course tees, fairways, and roughs
• Residential turf
• Commercial
• Parks
• Schools
• Cemeteries
• Sports facilities
• Athletic fields
• Sod farms

Does Vexis need to be watered in?

Vexis can be applied to wet or dry turf. For best results, water in granules within 48 hours of treatment.

What is the application rate?

The application rate is 4 lb. per 1,000 sq. ft. (174 lb. per acre). Retreatment after 30 days is allowed, up to 8.26 lb. per 1,000 sq. ft. per year (370 lb. per acre per year).

What type of formulation is Vexis?

Vexis is a granular formulation, which helps reduce off-target drift and volatility.

What is the maximum annual use rate for Vexis?

8.26 lb. per 1,000 sq. ft. (360 lb. per acre).

What is the reseed interval?

Wait to reseed or resod until after 21 days following application.

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