Annual Bluegrass Control in Warm-season Lawns

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Annual bluegrass (Poa annua) remains one of the toughest weeds to control in warm-season lawns. Poa annua is a prolific seed producer and genetically diverse, making it difficult to control and more prone to develop herbicide resistance than other weeds.

  • Maximize cultural control – Increasing competition by the desired turf is critical to minimizing annual bluegrass:
    • Maintain fertility
    • Keep mowing heights as high as feasible
    • Aerate to manage compaction
    • Avoid overwatering
  • Resistance concerns?
    • Poa annua has developed resistance to most of the herbicide modes of actions, both preemergence and postemergence options
    • Recent university research has shown that tank-mixing herbicides with different modes of action is more effective than rotating herbicides with different modes of action
  • Control options for bermudagrass and zoysiagrass lawns:
    • For lawns where Specticle has never been used or has not been used for 5+ consecutive years
      • A single or split application of Specticle FLO; see attachment for specific rates and timing
      • Delivers consistent control
  • Preferred option for lawns where Specticle has been used alone for 5+ years in a row
    • PRE3: A tank-mix of 3 modes of action (Specticle® FLO + Tribute® Total + Simazine); see attachment for specific rates and timing
    • Delivers the most consistent control
    • University researchers recommend tank-mixing multiple modes of action to reduce likelihood of developing resistance
  • Need more info? – Read and follow all label directions, see the attached information and contact your Bayer Area Sales Manager if you need assistance
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    Poa annua is a yellow-green winter annual that can be very unsightly in dormant warm-season lawns.

    Poa annua is a yellow-green winter annual that can be very unsightly in dormant warm-season lawns. (Bayer)

     

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