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Annual Bluegrass

How to Get Rid of Annual Bluegrass (Poa Annua)

Annual Bluegrass is a tricky winter annual weed that can be difficult to control and eliminate. This grass will go dormant and germinate during the fall/winter months and will flower in the spring. It often grows well in cooler conditions and shorter days and will sometimes die in the summer due to stress from the heat. What you apply and when you apply certain herbicides is very important to control your population. 

Characteristics

  • bright green leaf with boat-shaped tip
  • leaf has a smooth texture
  • low growing and tends to grow in bunches
  • winter annual weed
  • likes to grow in compact and moist areas
  • seed heads are greenish to white/off-white color

Treatment

Selective Herbicide

  • Not many selective herbicides are effective when it comes to controlling and eliminating your annual bluegrass.
  • Most chemicals are limited to warm season grass such as zoysiagrass, bermudagrass, centipede, and St. Augustine. 
  • Read the label to figure out if the chemical is safe for your lawn.
  • Make sure to properly identify your grass to make sure that the herbicide is safe for your lawn.  Choose your grass below to filter for products that are safe for your lawn:

 

Non-Selective Herbicides

  • A non-selective herbicide will kill any vegetation that it touches.
  • Apply ONLY when your surrounding turf grass is dormant (all green is gone) and spot treat trouble areas.
  • Apply when there is a low chance of rain to avoid runoff of chemical to other vegetation.
  • Recommended ProductsGly Pho-Sel Pro Dry 75 SGEraser Max, and Alligare Glyphosate 5.4 

Prevention

  • Application of pre-emergent herbicides is the most effective way to control annual bluegrass.
  • The first application needs to happen in late fall/early winter before the seed germinates.
  • Apply is when the soil temperature reaches around 70 degrees.
  • A second application is recommended for seeds that germinate late.
  • Pre-emergent herbicides only prevent germination. They do not get rid of an established population.
  • Recommended Products:  Prodiamine 65 WDG, Dithiopyr 40 WSB, and Hi-Yield Turf & Ornamental Weed & Grass Stopper  

 

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  1. Revolver Herbicide

    Starting at: $259.32

    Revolver Selective Herbicide may seem expensive but is effective on cool-season grasses at low use rates. The active ingredient is foramsulfron, a sulfonylurea type of active removes cool-season grasses from tolerant warm-season grasses. This post-emergent herbicide may be used to remove cool-season grasses from bermudagrass greens, tee boxes, collars and approaches surronding bermudagrass greens.

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  2. Specticle FLO -18 oz
    $279.95

    Specticle FLO with indaziflam, is a pre-emergent, selective and broad-spectrum herbicide that provides residual control of troublesome weeds such as crabgrass, annual sedge, poa annua and goosegrass. It also controls annual sedges and broadleaf weeds in turf, ornamentals (residential), hedgerows, hardscapes, Christmas trees, and conifers.

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  3. Hi-Yield Weed and Grass Stopper -12 lbs #33030

    Starting at: $17.15

    Hi-Yield Weed and Grass Stopper (contains Dimension Herbicide) Learn More
  4. Bonide Sedge Ender # 069

    Bonide's Sedge Ender Concentrate kills yellow nutsedge, crabgrass, foxtail weeds, and other listed grassy weeds. Sedge Ender provides pre-emergent and post-emergent weed control, killing the toughest weeds, down to the root. Sedge Ender may be used on warm season and coool season grasses and is excellent in cool weathers. Sedge Ender is a selective pre emergence and post-emergence herbicide.

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