Poa Annua Control



Poa Annua



Considered the world’s worst turfgrass weed, annual bluegrass (Poa annua) is a yellow-green winter annual that reaches about 7 inches in height when not mowed. Poa annua can be very unsightly on dormant bermudagrass or zoysiagrass. Poa annua is also objectionable on golf greens due to its color and growth habit, as well as production of whitish-colored seedheads which negatively deflect ball roll. Given the unsightly nature and potential impact of the weed, Poa annua control and prevention is essential throughout the year.
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Identifying Poa Annua



The first stage in Poa annua control is identifying Poa annua or bluegrass in its earliest stages. The majority of seed germinates in late summer to early fall when several consecutive days of mid-70°F highs occur. Earlier germination may occur in shaded or wet areas, or at higher elevations. Some germination can continue into early spring. Poa annua seedheads are light green to whitish and can withstand mowing heights found on golf greens. The majority of seedheads are formed during early spring. Up to 6,000 seeds are produced by each plant, which can remain viable for at least 6 years. Poa annua eventually dies in early summer with the onset of heat, leaving voids in the turf. To compound the problem with control of this difficult weed, Poa annua has become resistant to several classes of chemistry; sulfonylurea herbicides, glyphosate, dinitroaniline herbicides and triazine herbicides. Resistance also has been reported for ethofumesate and pronamide. Rotating between herbicides with different modes-of-action is the best means of preventing, or at least delaying, Poa annua resistance occurrence.
Maximize Cultural Control – Increasing competition by the desired turf is critical to controlling annual bluegrass:
  • Maintain fertility
  • Keep mowing heights as high as feasible
  • Manage compaction through frequent aerification and traffic management
  • Minimize soil moisture
  • Minimize diseases, insects, and nematodes to limit voids where annual bluegrass germination would occur

The Solution



In non-overseeded, warm-season turf, annual bluegrass control begins with an application of a preemergence herbicide. Specticle® provides outstanding Poa annua control in addition to many other winter annuals. Specticle should be applied prior to germination in the fall. Annual bluegrass control has been excellent with this product, but should be used only on well-established turf.




Close-up of Annual Bluegrass/Poa Annua
Close-up of annual bluegrass (Poa annua).

Photo: Dr. Bert McCarty, Clemson University.


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Specticle® FLO at a Glance



Active Ingredient: Indaziflam
Formulation: Flowable
WSSA Group: 29
Signal Word: No signal word required


Best Uses
  • Preemergence herbicide controls the most troublesome grassy and broadleaf weeds, as well as annual sedges
  • Extended residual control of annual bluegrass (Poa annua), goosegrass, crabgrass and 75 more weeds

Key Strengths
  • Broad-spectrum preemergence weed control
  • Long residual
  • Poa annua control
  • Low use rates

Attributes
  • Controls weeds by inhibiting cellulose biosynthesis – its primary site of action is the newly developing root of a germinated weed seedling
  • No stains, no odor formulation
  • Mixable with post-emergent herbicides
  • Newer mode-of-action – controls weeds known to develop resistance to other herbicides
  • Works on turf, landscapes and hardscapes

How to Apply
  • Apply to turf before weed seeds germinate
  • Use as a broadcast treatment or directed spray on bare ground or mulched areas around labeled ornamental plants and grasses
  • Adequate soil moisture is needed to activate Specticle FLO and provide maximum control
  • If weeds are present, tank-mix Specticle FLO with selective, post-emergent herbicides like Revolver®, Celsius® WG or Tribute® Total
  • To control emerged weeds in plant beds, dormant turf, cart paths or parking lots, use in conjunction with a non-selective herbicide

Non-Overseeded, Non-Dormant Bermudagrass/Zoysiagrass Fairways, Roughs, Tees & Greens
SOLUTION RATE (per acre) APPLICATION NOTES DO NOT USE ON
Specticle FLO 6.0 - 10.0 fl. oz. Preemergence herbicide, apply in late summer to
early fall prior to weed seed germination. See zone
recommendations for specific timing and rates.
Golf greens,
collars or tees


Non-Overseeded, Dormant Bermudagrass/Zoysiagrass Fairways, Roughs, Tees & Greens
SOLUTION RATE (per acre) APPLICATION NOTES DO NOT USE ON
Specticle FLO 6.0 - 10.0 fl. oz. Preemergence herbicide, apply in late summer to
early fall prior to weed seed germination. See zone
recommendations for specific timing and rates.
Greens






Poa Annua in Ryegrass
In ryegrass overseeded turf, Poa annua is largely not noticed until early spring when it forms numerous objectionable, whitish-colored seedheads.

Complete control in overseeded turf is difficult to achieve and requires a strategy of proper herbicide selection and overseeding timing.

Photo: Dr. Bert McCarty, Clemson University.



ALWAYS READ AND FOLLOW LABEL INSTRUCTIONS
Bayer CropScience LP, Environmental Science Division. 2 TW Alexander Drive, Research Triangle Park, NC 27709. 1-800-331-2867. www.backedbybayer.com. Bayer, the Bayer Cross, Celsius, Revolver, Specticle and Tribute are registered trademarks of Bayer. Not all products are registered in all states. ©2017 Bayer CropScience LP.
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