Nutsedge and Perennial Grasses

bentazon (Basagran T/O Herbicide -NON- Homeowner, Willowood Bentazon))

Rate 2 pints/A in 40 to 80 gal water or 0.75 fl oz/1,000 sq ft in 1 to 2 gal water. Second application in 10 to 14 days.

Time Apply to actively growing weeds.

Remarks Available as a soluble liquid. Bentazon acts as a contact herbicide to control yellow nutsedge, annual sedges, and broadleaf weeds, including chickweed and common purslane. It does not control purple nutsedge. Safe for use on established Kentucky bluegrass, fescues, bentgrass, perennial ryegrass, and several warm-season grasses.

Caution Do not apply to turf under stress from drought, cold, or other herbicides. Do not apply to newly seeded turf. Do not use on putting greens or collars. Note rate restrictions on perennial ryegrass. No more than 4 pints/A or 1.5 fl oz/1,000 sq ft can be applied in one season. Rain after application reduces activity.

Site of action Group 6: photosystem II inhibitor

Chemical family Benzothiadiazole

chlorsulfuron (Alligare Chlorsulfuron 75, Bayer Telar XP Herbicide)

Rate 1 to 5.33 fl oz/A or 0.25 lb ai/A or 0.0057 lb ai/1,000 sq ft

Time Apply when weed is actively growing.

Remarks A dispersible granule herbicide intended primarily for spot treatment to eradicate tall fescue in established Kentucky bluegrass, fine fescue, and bentgrass as well as in some warm-season grasses. Irrigate thoroughly to activate herbicide.

Caution Will kill perennial ryegrass. Treat only bentgrass mowed above 0.5 inch. Do not treat turf under stress from heat, drought, or other factors. Do not apply to saturated soils. Use a nonionic surfactant at 0.25 to 0.33 fl oz/gal of spray solution.

Site of action Group 2: acetolactate synthase (ALS) inhibitor

Chemical family Sulfonylurea

halosulfuron-methyl (Profine 75 Herbicide, Sedgehammer Turf Herbicide, Sedgehammer+ Turf Herbicide)

Rate 0.031 to 0.062 lb ai/A (2/3 to 1 1/3 oz/A)

Time Apply to well-established turfgrass when nutsedge is in the 3- to 8-leaf stage.

Remarks A 75% WDG for selective postemergence control of purple and yellow nutsedge in established turfgrass. Treat nutsedge in the 3- to 8-leaf stage. A second treatment may be required 6 to 10 weeks later. Use 0.5% nonionic surfactant concentration for broadcast applications. No more than 4 applications can be made, with the total use-rate not exceeding 5 1/3 ounces by weight of this product (0.25 lb ai/A per use-season). Use 0.25 to 0.5% v/v of a nonionic surfactant (1 to 2 quarts per 100 gal of spray solution) for broadcast,high volume applications,

Caution Do not exceed 1 quart/A of surfactant; higher rates can injure turf. Use only nonionic surfactants with at least 80% ai Do not mow turf for 2 days before or after application. Good results if no rain for 3 hours after application; best results if no rain for at least 4 hours after application. Turf must have a well-developed root system and a uniform stand before product is applied. Do not apply to putting greens or turfgrass under stress. Do not use clippings from treated turf as mulch around ornamentals.

Site of action Group 2: acetolactate synthase (ALS) inhibitor

Chemical family Sulfonylurea

mesotrione (Tenacity)

Rate 4 to 8 fl oz/A in 30 gal water for both pre- and postemergence control; For new seedlings: use 5 to 8 fl oz/A. For bentgrass control: use 5 fl oz/A in 30 gal water. Do not apply more than 16 oz/A per year, or 0.5 lb/A.

Time Tenacity is a systemic pre- and postemergence herbicide for the selective contact and residual control of weeds in turfgrasses. Applied preemergence, weeds absorb Tenacity during emergence. Dry conditions after application may reduce preemergence activity. If rain (0.15 inches) has not fallen within 10 days after a preemergence application, activate with 0.15 inches of irrigation. Used postemergence, susceptible weeds absorb Tenacity through foliar contact and soil absorption. Foliage of treated weeds stops growing after application, then turns white (loss of chlorophyll); and death may take up to 3 weeks. A repeat application is required after 2 to 3 weeks for improved postemergence weed control. Add a nonionic surfactant in postemergence applications. Tenacity may temporarily whiten turfgrass foliage. In general, symptoms appear 5 to 7 days after application and last several weeks. A repeat application to the same site causes less whitening of plant tissue. Tenacity effectively controls weed before or during seeding certain turfgrasses during turf renovation. Do not apply to newly germinated turfgrass until it has been mowed twice, or approximately 4 weeks after emergence. Young, actively growing weeds are easiest to control. Efficacy on mature weeds is reduced under moisture stress. Tenacity can be tank mixed with other herbicides, but check label for tank-mixtures already tested. Herbicides not listed on label as being tested for tank-mixtures must be tested for compatibility, safety, and efficacy before treating large areas. In established turf, Tenacity is more effective as a postemergence application unless combined with another soil active herbicide. Tenacity at 5 fl oz/A in at least 30 gal/A water in a 2- to 3- week interval controls creeping bentgrass. Apply with a nonionic surfactant. Up to three applications can be made. Applications may be more effective in late summer/early fall, just before bentgrass renews growth, than in spring/early summer.

Remarks Use sites include noncrop areas: golf courses, sod farms, athletic fields, parks, residential and commercial properties, cemeteries, airports, and lawns. Do not use on golf greens. Maintain a 5-ft buffer between treated areas and putting greens. Do not exceed 5 fl oz/A per application to perennial ryegrass or fine fescues or mixed stands with more than 50% perennial ryegrass and/or fine fescue. Withhold traffic on treated areas until spray has dried and irrigate lightly to move product from turf foliage before resuming normal irrigation to prevent movement onto sensitive species such as bentgrass. Do not plant any crop other than turfgrass species for 18 months after the last application of Tenacity, or injury may occur. Do not apply an organophosphate or carbamate insecticide within 7 days of a Tenacity application, as turf injury may occur. Do not apply by air or through any type of irrigation system. Do not exceed 16 oz/A Tenacity (0.5 lb mesotrione/A) per year. Restricted-entry interval is 12 hr. Do not use grass clippings from treated turf as mulch around trees or in vegetable/flower gardens.

New Seedings/New Lawn Establishment: Apply Tenacity at 5 to 8 fl oz per/A in at least 30 gal water/A prior to seeding or post seeding of tolerant turfgrass species listed on this label, except fine fescue. Tenacity may reduce density of fine fescue seedings. Tenacity can be used on grass seed blends that contain less than 20% by weight of hard or fine fescue. Tenacity will control many monocot and dicot weeds that compete with and slow the establishment of the turfgrass stands. Apply at grass seeding or close to seeding for best performance. Avoid spraying on newly germinated turfgrass plants. Wait until the newly germinated turf has been mowed two times, or four weeks after emergence (whichever is longer), before making a postemergence application.

Spot Application of Tenacity: apply at 1 gal per 1,000.sq ft

Spray Mix

Rate of Tenacity (teaspoons)

NIS adjuvant (teaspoons)

2 gal

1

3

Site of action Group 27: inhibits 4-hydroxyphenylpyruvatedioxygenase (4-HPPD)

Chemical family Triketone

sulfentrazone (Dismiss)

Rate See label. Dismiss turf herbicide will control or suppress sedges at 4 to 12 fl oz/A. Apply the highest rate consistent with the rate needed for turfgrass safety. (See Table 1 on label). Rates lower than 12 fl oz/A will generally control sedges for at least 60 days. Good coverage is needed for optimum control of sedges. For optimum control of purple nutsedge, split applications are recommended. Apply 4 to 8 oz/A as an initial application followed by a second application when evidence of actively growing purple nutsedge is visible.

Time First application of this product can be made following the second mowing providing the turfgrass has developed into a uniform stand with a good root system. Creeping bentgrass, Kentucky bluegrass, rough bluegrass, fine fescue, tall fescue and perennial ryegrasses are tolerant to this herbicide.

Remarks Temporary discoloration of some turf types may result from use of surfactants or adjuvants. High temperatures and high relative humidity may increase the risk of temporary discoloration. Use of surfactants is not recommended. Discolored leaf tissue will be removed with mowing. To also reduce potential for discoloration, do not apply Dismiss Turf Herbicide on turfgrass that is weakened by weather, mechanical, chemical disease or other related stress. Maintain proper cultural practices such as adequate moisture and fertility levels to promote healthy turf growth.

Caution This pesticide is toxic to marine/estuarine invertebrates. Do not apply directly to water, to areas where surface water is present, or to intertidal areas below the mean high water mark. Drift and runoff may be hazardous to terrestrial and aquatic plants in neighboring areas. Do not use on coarse soils classified as a sand and which have less than 1% organic matter. Do not apply to golf course putting greens or tees. Do not use on turfgrasses other than those listed on the label. Temporary turfgrass discoloration has been observed when Primo has been withering-tank mixed or applied within 7 days of a Dismiss Turf Herbicide application. It is recommended that Primo applications be made 7 days prior to, or after Dismiss Turf Herbicide application to reduce risk of turfgrass discoloration. Do not apply to sod within three months of harvest. It is also recommended that the sod be established for at least 3 months before an application of Dismiss turf herbicide.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family Triazinone