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Annual Sedge

Description

This species is one of the few sedge species that is a true annual. As a result, this sedge is easier to control than many other perennial sedges. Annual sedge has a very characteristic seedhead that tends to be relatively large compared to other sedges, and the seedhead is flattened with a toothed outline. Annual sedge tends to have a more "clumpy" appearance than other sedges particularly when it occurs in low densities. This sedge also tends to emerge later in the spring/summer than most other sedge species.

Cultural Control

This species is one of the few sedge species that is a true annual. As a result, this sedge is easier to control than many other perennial sedges. This sedge also tends to emerge later in the spring/summer than most other sedge species. Sedges are weeds that resemble grasses but unlike grasses, sedges have three-sided or triangular stems. It is important to properly distinguish sedges from grasses because management is totally different. Sedges are plants that thrive in wet or poorly drained soils but can survive in areas that are not wet. Because of frequent irrigation in highly maintained turf, sedges often thrive in the turfgrass environment. Sedges often become established in wet areas and spread to other areas that are not poorly drained or wet areas. Therefore, it is important to recognize areas where sedges can become established and prevent spread of these sedge species to other areas of the golf course or landscape.

Chemical Control

Herbicide and Formulation
Amount of Formulation per 1,000 sq ft
Amount of Formulation per Acre
Pounds Active Ingredient per Acre

Preemergence and Postemergence Control

Herbicide and Formulation

mesotrione, MOA 27 (Tenacity) 4 SC

Amount of Formulation per 1,000 sq ft

0.092 to 0.183 fl oz

Amount of Formulation per Acre

4 to 8 fl oz

Pounds Active Ingredient per Acre

0.125 to 0.25

Precaution and Remarks

Use on residential turf, golf courses (not greens) and sod farms for pre- and postemergence weed control. Tolerant turfgrasses include St. Augustinegrass, centipedegrass, tall fescue, fine fescue, Kentucky bluegrass, and perennial ryegrass. Add a nonionic surfactant and repeat application after 2 to 3 weeks for improved postemergence control. Tank mix with Barricade 65 WG for extended preemergence grassy weed control. Can be applied at seeding to all tolerant grasses except fine fescue. After turf germination, wait 4 weeks or until turf has been mowed twice before making a postemergence application. Also controls henbit, chickweed, dandelion, white clover, Florida betony, Florida pusley, ground ivy, oxalis, wild violet, creeping bentgrass, and yellow nutsedge.

Preemergence and Postemergence Control

Herbicide and Formulation

sulfentrazone + prodiamine, MOA 14 + 3 (Echelon 4 SC) 4 SC

Amount of Formulation per 1,000 sq ft

0.184 to 0.826 fl oz

Amount of Formulation per Acre

0.5 to 2.25 pt

Pounds Active Ingredient per Acre

0.25 to 1.125

Precaution and Remarks

For use in residential and institutional lawns, athletic fields, sod farms, golf course fairways and roughs, roadsides, utility right-of-ways, railways, and industrial areas. Apply to turf following a second mowing if a good root system has been established. Apply up to 12 fluid ounces per acre to bentgrass at 0.5 inches or higher, fine fescue, and perennial ryegrass. Apply 18 to 24 fluid ounces per acre to perennial bluegrass, tall fescue, and all warm season grasses except St. Augustinegrass (do not apply) and bermudagrass (apply 18 to 36 fluid ounces per acre). For sod production, apply 6 months after establishment, and do not harvest within 3 months. Do not apply with adjuvants or surfactants. Echelon should not be applied to cool-season turf with N-containing fertilizers unless some short-term discoloration is tolerable.

Postemergence Control

Herbicide and Formulation

MSMA, MOA 17 (various brands)

Amount of Formulation per 1,000 sq ft

Amount of Formulation per Acre

several concentrations

Pounds Active Ingredient per Acre

1.82 to 4.5

Precaution and Remarks

Bermudagrass, bluegrass and zoysiagrass are tolerant. Injury may result on bentgrass, fescue and St. Augustinegrass (commercial sod production only). Do not use on carpetgrass or centipedegrass. MSMA restrictions: For existing golf courses, spot treat (100 square feet per spot) not to exceed 25% of total acreage. For new courses, make 1 broadcast application per year. For sod farms, make 1 to 2 broadcast applications per year and maintain 25 feet buffer around permanent water bodies. For highway rights of way, make 2 broadcast applications and maintain 100 feet buffer around permanent water bodies.

Postemergence Control

Herbicide and Formulation

bentazon, MOA 6 (Basagran T/O or Lescogran) 4 SL

Amount of Formulation per 1,000 sq ft

0.75 to 1.5 fl oz

Amount of Formulation per Acre

1 to 2 qt

Pounds Active Ingredient per Acre

1 to 2

Precaution and Remarks

For control of yellow nutsedge in established bluegrass, fescues, bentgrass, ryegrass, bermudagrass, bahiagrass, St. Augustinegrass, centipedegrass, and zoysiagrass. Apply to yellow nutsedge when actively growing under good soil moisture conditions. Additional applications may be made at intervals of 10 to 14 days until nutsedge is controlled.

Postemergence Control

Herbicide and Formulation

imazapic, MOA 2 (Plateau DG) 70 DG

Amount of Formulation per 1,000 sq ft

0.032 to 0.066 oz

Amount of Formulation per Acre

1.43 to 2.86 oz (1 to 2 water soluble packs)

Pounds Active Ingredient per Acre

0.063 to 0.125

Precaution and Remarks

For use on centipedegrass only when grown as fine turf in nonresidential areas such as commercial and industrial turf, golf courses, and other recreational areas. Not for use in home lawns. Do not use on other turfgrass species. See label for mixing instructions of water soluble packs. A repeat application may be needed on tough to control perennial weeds such as bahiagrass. The highest labeled rate may discolor centipedegrass by causing a red color.

Presentations

Publications

Species Data

Growth Season/Life Cycle

summer annual weed

Seed Arrangement on Spikes

tightly bunched; seedhead clusters of flat green spikes on stalks

annual globe
annual globe
annual globe
seedhead
seedhead
seedhead
Seedhead Spikelet Shape

flattened

annual globe
annual globe
annual globe
autopsy2
autopsy2
autopsy2
p1120557 annualsedge
p1120557 annualsedge
p1120557 annualsedge
seedhead
seedhead
seedhead
Tuber Type

none