Fall Poa Control in Warm-season Lawns and Fairways

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Annual bluegrass (Poa annua) remains one of the toughest weeds to control in warm-season golf and lawn turf. 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
    • Manage compaction through frequent solid-tine aeration or slicing and traffic management
    • Minimize soil moisture
    • Minimize diseases, insects, and nematodes to limit voids where annual bluegrass can germinate
  • Resistance concerns
    • Poa annua has developed resistance to most of the herbicide site of actions, both preemergence and postemergence options
    • Recent university research has shown that tank-mixing herbicides with different sites of action is more effective than rotating herbicides with different sites of action
  • For proactive resistance management and maximum Poa annua control:
    • Lawns:
      • A single application of Specticle® FLO in September/October (depending on your location)
    • On golf courses where Specticle has never been used or has not been used for 5+ consecutive years
      • A single application of Specticle FLO in September/October (depending on your location)
      • Delivers consistent control
    • Preferred option for golf courses where Specticle has been used alone for 5+ years in a row
      • PRE3: A tank mix of three sites of action (Specticle FLO + Tribute® Total + simazine) applied in November/December
      • Delivers the most consistent control
      • Recommended approach by Bayer and University Turf Weed Scientists to limit herbicide 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.

Resistant POA in lines in Bermuda grass 

Poa annua escapes after a glyphosate plus preemergence herbicide tank-mix (Bayer)

  Warm-season Poa annua solution guide
Zac Reicher

by Zac Reicher , Ph.D., Green Solutions Team Specialist

Thursday, July 22, 2021

Rob Golembiewski

by Rob Golembiewski , Ph.D., Green Solutions Team Specialist

Thursday, July 22, 2021