Application Guidelines for XONERATE® Herbicide.

How to apply XONERATE:

XONERATE can be applied up to four times at a 1 ounce per acre rate for bentgrass. (KBG and KBG/Ryegrass up to 2 ounce rate at two applications). It should be used on turf that has smaller percentages of Poa annua (less than 10 percent Poa annua population), while transitioning to desirable turfgrass. Rates and applications will vary by turf type – refer to the product label. 

Application Steps:

1. Apply in spring months (early summer in northern United States).

2. Two to four weeks after active creeping bentgrass growth resumes.

3. Make applications at air temperatures of 55 – 80°F. Temperatures should not exceed 80°F (KBG temp range up to 85 °F).

4. Repeat the application at seven-day intervals for a maximum of four applications (applications should cease once Poa annua control is at an acceptable level, no Poa annua remains, or after four applications).2

5. Repeat applications should be made in the opposite direction as the previous application.

6. Creeping bentgrass can be seeded at seven or more days after the last application of XONERATE.

7. XONERATE may be applied in the spring at six months after seeding creeping bentgrass in the fall months of the previous year.

8. XONERATE may be tank-mixed. Water is the recommended liquid carrier (please read all label information carefully).

Turf species acceptable for XONERATE

XONERATE should only be applied to sites that are composed of the following turfgrass species unless trial use has indicated that the turf species not listed here is tolerant to amicarbazone DF. Apply to turfgrasses established for six months unless otherwise directed on this label. See the XONERATE label for use on specific turf species. 

Cool-Season Turfgrasses3 

Bentgrass, creeping

Agrostis stolonifera   

Bluegrass, Kentucky 

Poa pratensis 

Fescue, Fine

Festuca sp. 

Fescue, Tall

Festuca arundinacea 

Ryegrass, Perennial

Lolium perenne 

 

Warm-Season Turfgrasses3

Bahiagrass

Paspalum notatum 

Bermudagrass   

Cynodon dactylon 

Buffalograss 

Buchloe dactyloides    

Centipedegrass

Eremochloa ophiuroides 

Kikuyugrass 

Pennisetum clandestinum

St. Augustinegrass 

Stenotaphrum secundatum

When applied as directed under the conditions described, established turfgrasses are tolerant to this product. Temporary yellowing of the turf may occur 14 to 21 days after application.  This effect is temporary and the turf will recover in 14 to 21 days. Fill-in of bare spots caused by removal of Poa annua may take longer. Cultural practices directed at encouraging the growth of bentgrass will speed up the fill-in process.

Protocols:

Cool-Season Turfgrasses

[ Poa annua control in established creeping bentgrass, fine fescues, tall fescue, perennial ryegrass and Kentucky bluegrass.]

 Creeping Bentgrass — Tees

For Poa annua control, apply XONERATE in the spring months, two to four weeks after the resumption of active bentgrass growth, at 1.0 ounce of product per acre. Repeat the application at seven-day intervals for a maximum of up to four applications. Repeat applications should be made in the opposite direction as the previous application. Apply at air temperatures ranging from 55 to 80° F.

Creeping Bentgrass — Fairways and Roughs

For Poa annua control, apply XONERATE in the spring months, two to four weeks after the resumption of active bentgrass growth, at 1.0 ounce of product per acre. Repeat the application at seven-day intervals for a maximum of up to four applications. Repeat applications should be made in the opposite direction as the previous application. Apply at air temperatures ranging from 55 to 80° F.

Fine Fescues, Tall Fescue, Perennial Ryegrass

For Poa annua control, XONERATE may be applied twice at 2.0 to 4.0 ounces product per acre at 14- to 21-day intervals. Second application should be made in the opposite direction to the first application. XONERATE should not be applied to cool-season turfgrasses when the daytime air temperature is expected to exceed 85° F, or immediately before or after periods of high air temperatures.

Kentucky Bluegrass

For Poa annua control, XONERATE may be applied twice at 2.0 ounces product per acre at 14- to 21-day intervals in the spring months. Alternatively, apply XONERATE in the spring months at 1.0 ounce of product per acre. Repeat the application at seven-day intervals for a maximum of up to four applications. Repeat applications should be made in the opposite direction to the previous application. XONERATE should not be applied to cool-season turfgrasses when the daytime air temperature is expected to exceed 85° F, or immediately before or after periods of high air temperatures. Kentucky Bluegrass should be established for twelve months before application of XONERATE.

Warm-Season Turfgrasses

[ Poa annua and annual broadleaf weed control in established Bahiagrass, Bermudagrass, Buffalograss, Centipedegrass, Kikuyugrass, Seashore Paspalum, St. Augustinegrass and Zoysiagrass.] 

Poa annua and annual broadleaf weed control.

XONERATE may be applied post-emergence to tolerant warm-season turf at rates of 3.0 to 10.0 ounces per acre. XONERATE may be applied to warm-season turfgrasses that are dormant, partially dormant or actively growing.

NOTE: Do not use XONERATE on St. Augustinegrass in the summer months when air temperatures are greater than 90° F. When using low rates (3.0 to 5.0 ounces per acre) repeat applications are recommended, but the maximum rate per season must not exceed 10.0 oz. of XONERATE. Repeat applications should be made two to three weeks after the initial application. Repeat applications should be made in the opposite direction to the previous application.

Bermudagrass Tees and Fairways Overseeded in the Fall with Perennial Ryegrass or Poa trivialis (Roughstalk Bluegrass)

XONERATE may be applied at 5.0 to 10.0 ounces per acre one or more weeks before overseeding bermudagrass with either perennial ryegrass or Poa trivialis for control of emerged Poa annua. Additional spring applications will be required to control Poa annua that emerges over the following months.

2 Rates and applications will vary by turf type and geography.

3 Cool- and warm-season turfgrasses have demonstrated acceptable tolerance to amicarbazone 70DF. However, not all cultivars have been evaluated.