WARM-SEASON ESTABLISHED TURFGRASSES - POA TRIVIALIS CONTROL

General Information

Use Information

Katana Turf Herbicide is a selective herbicide for removal of overseeded cool-season grasses as well as control of annual and perennial grasses, sedges, and broadleaf weeds in Bermudagrass, zoysiagrass, buffalograss, centipedegrass, seashore paspalum, and certain other warm-season turfgrasses. This product has post-emergence and some pre-emergence activity. Katana Turf Herbicide may be used on golf courses (fairways, roughs, greens, tees, collars, and approaches) and the following turf areas: industrial parks, tank farms, sod farms, seed farms, cemeteries, professionally managed sports fields, commercial turf. Residential turf application is limited to targeted, directed spray to weeds only (see specific limitations under Application Restrictions) for control of cool season grasses and weeds from tolerant grasses.

Weed growth stops within hours after the application, however symptom progress from discoloration or chlorosis to necrosis generally requires from 3 to 6 weeks. Speed of control is generally a function of weather with faster action during warmer weather and actively growing weeds and turf.

Katana Turf Herbicide controls weeds by inhibiting the acetolactate synthase (ALS) biochemical process. Some weeds may contain naturally occurring populations that are resistant to ALS inhibiting herbicides. Applications of ALS inhibiting herbicides, when used alone, over a period of time may lead to biotypes that are resistant to ALS herbicides. This then leads to a reduction in the level of control obtained through the use of these herbicides. To prevent or delay the build-up of ALS resistant weeds, weed management programs should include the use of appropriate registered herbicides for control of these weeds that have a different mode of action. Applications of herbicides with a different mode of action should be used during the same year or in sequential years.

Application Restrictions

- Do not apply Katana Turf Herbicide aerially.
- Do not apply Katana Turf Herbicide through any irrigation system.
- Repeat applications may be made at 2 to 6 weeks after the application for optimum weed control.
- The maximum yearly application rate is 9.0 oz. per acre (0.14 lbs a.i./acre).
- Use only on turfgrasses listed below (unless listed under weeds controlled) or severe injury may result.
- Do not apply to new seeded, sodded or sprigged turfgrass until well established.
- Allow at least 2 weeks from the last application to the time of overseeding when applied at 1.5 oz./A. Allow 4 weeks for rates above 1.5 oz./A.
- Do not plant back another crop (other than turfgrass) in Katana Turf Herbicide treated areas for one year.
- Golf green treatments are restricted to Bermudagrass and seashore paspalum only.
- Some ornamental shrubs, plants and trees may be sensitive to Katana Turf Herbicide. Do not make applications that would result in direct contact or accumulation under the dripline of sensitive plants.
- Do not use fresh clippings from treated areas as mulch around trees, shrubs, or in vegetable/flower gardens.
- Do not apply when grasses are under stress as injury may occur.
- Make applications to actively growing weeds and turf.
- Do not apply to saturated turf/soils.
- Do not apply to hydrophobic soils or turfgrass with excessive thatch accumulation, unless thorough aeration has been completed prior to application.
- Maintain a 25 foot buffer between sensitive grasses/plants and the treated area.
- Do not apply this product directly to, or otherwise permit drift or spray mist to come into contact with cotton, legumes, tobacco, garden/vegetable crops, flowers, ornamental plants, shrubs, trees, and other desirable or sensitive plants. Do not apply to exposed roots of shallow rooted trees and shrubs. Be particularly careful not to overdose under the dripline of trees.

Use Precautions Around Sensitive Grasses

- Use extreme caution when applying this product to slopes that drain onto sensitive turf grasses such as bentgrass, ryegrass, and Poa trivialis.
- The product should be dry on the leaf surface prior to allowing traffic on the treated area.
- Irrigation is not recommended within 6 hours after the application. However, for the next two mornings after application, if dew is present, irrigate lightly (0.1 to 0.2 inches) to remove the dew.

Application Information

Rainfastness: One inch of rainfall within 3 to 6 hours of application may result in reduced weed control or require reapplication.

All Specified Application Sites Except Residential Turfgrass

Broadcast: Katana Turf Herbicide may be applied as a broadcast treatment in a minimum of 20 gallons of water per acre. Higher spray volumes of 60 to 174 gallons of water per acre are recommended where weed populations are dense or with adverse growing conditions.
See below for use rates.

Spot Treatments with Pump-Up or Backpack Sprayers: Dissolve 0.03 to 0.068 oz. (1 to 2 grams = 1/4 to 1/2 teaspoon) of Katana Turf Herbicide per 1 gallon of water, add 1 teaspoon of a nonionic surfactant and spray mixture at a rate of 1 gallon per 1000 sq. ft. If needed for hard-to-control weeds, retreat in 3-4 weeks. (See specific weed application rates).

Residential Turfgrass Application Sites

Residential turfgrass sites are limited to targeted or spot treatment with the spray directed to the weeds. Spot treatments are limited to not more than 10% of a residential lawn.

Spot Treatments with Pump-Up or Backpack Sprayers: Dissolve 0.03 to 0.068 oz. (1 to 2 grams = 1/4 to 1/2 teaspoon) of Katana Turf Herbicide per 1 gallon of water, add 1 teaspoon of a nonionic surfactant and spray mixture at a rate of 1 gallon per 1,000 sq. ft. If needed for hard-to-control weeds, retreat in 3-4 weeks. (See specific weed application rates)

Limitations, Restrictions, and Exceptions

TURFGRASS SPECIES WHICH MAY BE TREATED BERMUDAGRASS, BUFFALOGRASS, ZOYSIAGRASS, CENTIPEDEGRASS, SEASHORE PASPALUM, AND CERTAIN OTHER WARM-SEASON TURFGRASSES

Turf Tolerance Katana Turf Herbicide may be used on the following warm-season established turfgrass cultivars:

Bermudagrass: Champion, Common, FloraDwarf, Midiron, MS Express, MS Supreme, Princess, Quickstand, Riviera, Sahara, TifDwarf, TifEagle, Tifsport, Tifway 419, TifGreen 328, Vamont, Yukon.

Zoysiagrass: Common, Emerald, El Toro, Meyer.

Centipedegrass: Maximum use rate of 1.5 oz./A (0.02 lbs. a.i./acre) to fully green, actively growing turf. Do not apply during spring and fall transition.

Seashore Paspalum: For weed control, seedhead suppression and growth suppression, use a maximum rate of 1.5 oz/A to fully green, actively growing turf. Do not apply during spring and fall transition.

- Expect some turf discoloration approximately 2 weeks after application
- Expect up to 80% seedhead suppression and expect growth suppression (60 to 80% clipping reduction) for up to 4 weeks. Actual results will depend upon environmental conditions before, during and after application
- Wait at least 4 weeks between applications
- The use of Katana Turf Herbicide with urea based fertilizer may result in unacceptable injury to seashore paspalum.
- Maintain healthy turfgrass before and after applications
- Always irrigate stressed turf prior to application of Katana Turf Herbicide.
Tank-mixing with trinexapac-ethyl (Primo MAXX) during active growth may improve Seashore Paspalum quality (golf course fairways).

- Bermudagrass; Buffalograss; Zoysiagrass: Other cultivars should be tested on a small area to determine tolerance prior to large scale use.
- Seashore Paspalum: All cultivars should be tested on a small area to determine tolerance prior to large scale use.

Other warm-season grasses such as Argentine Bahiagrass, Carpetgrass, and St. Augustine grass are intolerant.
Cool-season grasses such as Ryegrass, Fescue, Bentgrass and Kentucky Bluegrass are intolerant.

REMOVAL OF OVERSEEDED COOL-SEASON TURFGRASS FROM LISTED WARM-SEASON TURFGRASSES

Spray Volume: 20 to 174 gal/Acre or 0.46 to 4 gal/1000 sq. ft.

Acceptable sites include golf course fairways, roughs, greens, tees, collars, and approaches that have been overseeded with cool-season turfgrass. Katana Turf Herbicide may also be used on sports fields and commercial turf that have been overseeded with cool-season turfgrass.

Note: Applications for spring transition do not negatively impact Bermudagrass greenup. Katana Turf Herbicide shows a slight rate response with control occurring within 3 to 4 weeks after the application with the highest labeled rate giving better and faster control. Therefore, the Bermudagrass or zoysiagrass turf should be at 50 to 60% greenup at the time of the application for optimal maintenance of a green turf situation.

Adjuvant Use Requirements

The use of a non-ionic surfactant at 0.25 percent by volume (1 qt/100 gal) provides maximum performance.

Method
Restricted Entry Interval

12 hours