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Cutless* Back
What is Cutless?
Cutless is a foliar applied and root absorbed turf growth regulator that reduces internode elongation of a broad range of both monocotyledonous and dicotyledonous plants.

It has demonstrated desirable growth regulation of plants requiring routine mowing, pruning or edging as well as those subject to lodging, without phytotoxic effects.

This includes most commonly grown perennial turfgrasses, a number of ornamental groundcover species, herbaceous and woody ornamental plants and deciduous tree species.

What does Cutless do?

Any growth regulator can slow the growth rate of plants, but many do it by suppressing their rate of development.

But Cutless is a turf growth regulator with a different mode of action. Its unique pyrimidine chemistry lets it reduce the growth rate of plants without sacrificing their development. Individual plant cells continue to divide and grow at a reduced rate.

Cutless does this by interrupting the functions of gibberellic acid, and thus shortening the internodes, which reduces or slows the turfgrass's rate of growth, but does not suppress its development.

How Cutless improves turf quality.

Key benefits for warm-season turfgrasses
(Bermudagrass, zoysiagrass, etc.)
Key benefits for cool-season turfgrasses
(bentgrass, bluegrass, ryegrass, etc.)
  • Increased turf density
  • Improved turf color (darker green)
  • Reduced water use, resulting in less turf wilt
  • Up to 50% reduction in mowing
  • Up to 50% fewer clippings
  • Increased turf density
  • Improved turf color (darker green)
  • Reduced water use, resulting in less turf wilt
  • Up to 50% reduction in mowing
  • Up to 50% fewer clippings
  • Promotes conversion from Poa annua to perennial turfgrasses

Cutless' effect on plant growth and cultural practices.

How Cutless works. Because it is antagonistic to both the formation and action of growth-promoting gibberellic acid in plants, Cutless causes a reduction in internode elongation. This makes turf more compact and lower growing.

Root effects and tillering. Cutless has no adverse effects on turfgrass root systems and helps encourage more tillers and stolons, with the net effect of increasing turf density.

Water use. Cutless reduces the leaf area of turfgrass plants. The smaller leaf area results in less water loss due to transpiration. In university tests, Cutless treatments resulted in water conservation from 11% to 29% compared to mowed untreated grass.

Color. At the peak of Cutless' growth effects, the grass turns a darker green color.

Cutless and turfgrass cultural practices.

During the period of modified growth of Cutless treated turfgrass, changes in the following cultural practices can be expected.

Mowing. Because Cutless treated grass grows at a slower rate; it takes longer to reach normal mowing height. This reduces both mowing requirement and the quantity of grass clippings.

If normal practice returns clippings to the ground, there will be less clipping residue and unsightly clumps of freshly mowed grass will be reduced or eliminated.

Reduced volume of clippings also may slow the buildup of thatch in turfgrass.

Fertilizing. Generally, Cutless won't alter the total nutrient requirements of healthy turfgrass. It will not change the timing of current fertilizer programs. Nitrogen or a complete fertilizer should be applied to turf at the time of its treatment with Cutless.

Bentgrass conversion. To maintain high population of bentgrass turf, Cutless should be included as part of an annual maintenance. Poa annua is highly sensitive to Cutless' growth effects and it will not compete effectively with desirable perennial turfgrasses for the duration of Cutless' growth response.

Creeping bentgrass can be gradually increased by combining properly timed Cutless applications over several growing seasons with cultural practices which favor the desired grasses, such as: reduced irrigation frequency and compaction (lighter weight mowers); removal of Poa annua seedheads; withholding phosphate fertilizer and timing other nutrient applications to coincide with active periods of perennial grass growth; raising mowing heights; properly timed reseeding with more competitive perennial grass species.

Irrigation. Cutless treated turfgrass transpires less, resulting in less water used than on similar untreated grass, so irrigation frequency can be reduced.

Weed suppression. Research has shown that Cutless will inhibit the growth of a number of troublesome broadleaf weeds, including prostate and spotted spurge, oxalis, clover, veronica, henbit and ground ivy. Additionally, Cutless will inhibit growth of some annual grasses—including Poa annua, crabgrass, goosegrass, foxtail, and annual sedges.

What to expect from Cutless.

Cutless should be applied only to healthy, established stands of high quality turfgrass species at the onset of their active growing periods.

Irrigation shortly after its application will enhance maximum uptake of Cutless. Initial visible symptoms of Cutless treatment will appear after 7 to 19 days as a slight discoloration of the treated area. A slight leaf tip browning may also appear. One to two weeks later, the treated grass will turn darker green.

Maximum Cutless growth reduction occurs between weeks 3 and 12, with total dissipation of its effects after 10 to 14 weeks. From then on, treated turfgrasses do not express any unusual growth patterns.

Apply Cutless with boom or spot sprayer to keep fairways beautiful and hard-to-mow areas neat, well groomed.

Where to apply. Cutless is designed especially for growth modification of warm- and cool-season turfgrass on fairways. It also can be used for treatment around bunkers, teeing areas, and cart paths, green collars, slopes and other hard-to-mow areas.

When to apply. The best time to treat mature stands of grass with Cutless is at the beginning of active spring growth, usually after the second mowing. Mow just prior to treatment, then again, one week following.

How to apply. Add water-soluble packets of Cutless wettable powder to half-full spray tank, let dissolve, agitate and finish filling tank. Continue agitation while spraying to assure uniform mixture.

Use properly calibrated boom sprayer with nozzle screens and in-line strainers no finer than 50 to 200 gallons per acre (1 to 5 gallons per 1,000 sq. ft.).

Apply Cutless to hard-to-mow areas with hose from tank attached to a hand-held boom or a spray gun. A properly calibrated backpack sprayer also can be used.


The potential toxicity of flurprimidol—the active ingredient in Cutless—was evaluated in studies involving a variety of mammalian, fish and wildlife species. Here are the results:

In studies on rats, mice, rabbits, rainbow trout, bluegills, daphnia, bobwhite, mallards and earthworms, flurprimidol has a low order of acute toxicity and was not significantly irritating to eyes or skin.

In studies on rates, mice and Chinese hamsters, flurprimidol was not genotoxic, causing no bacterial mutation.
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