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Choose the latest improvements for spring dead spot control this fall

By Lane Tredway, technical services manager for Syngenta

Spring dead spot is the most destructive disease of bermudagrass turf. Although symptoms appear in spring, as the name implies, fall is the key time to protect your turf against spring dead spot. Preventive applications must be made before the bermudagrass goes dormant so the active ingredient can be absorbed and translocated. Two applications on a 28-day interval beginning when soil temperatures decline to 70° F are recommended in most cases.

Posterity®, Velista® and Headway® fungicides are effective options for spring dead spot control. Product selection is often guided by management intensity and other disease pressures. Typical recommendations for spring dead spot control on golf course turf are as follows:

Golf course greens:

  • Posterity at 14 fl. oz./A (two applications on a 28-day interval)
  • If take-all root rot is a concern, tank mix both applications with Headway at 65 fl. oz./A
    • In addition to take-all root rot prevention, Headway provides beneficial growth regulation and improved quality of bermudagrass putting greens from winter to spring
  • Applications should be watered-in immediately with at least 0.15 in. of irrigation

Golf course tees, fairways and roughs:

  • Posterity at 7 fl. oz./A or Velista at 22 oz./A (two applications on a 28-day interval)
  • It can be beneficial to upgrade to the high rates of Posterity (14 fl. oz./A) or Velista (30 oz./A) for one or two years to get the disease under control, and then switch to lower rates for long-term prevention
  • Velista provides excellent large patch prevention when applied for spring dead spot, so is recommended for zoysiagrasses or bermudagrasses that are prone to this disease
  • Water-in immediately with at least 0.15 in. of irrigation

Treatments applied to MiniVerde® Bermudagrass on Sept. 22 and Oct. 20, 2016. Data collected April 28, 2017. Source: Bruce Martin, Clemson University, Florence, SC, 2017.

Proper timing of spring dead spot applications (when soil temperatures decline to 70° F) is essential to get the best results. Warm temperatures have lingered deep into the fall in recent years, so the traditional applications in mid-September and mid-October have been too early. To monitor current soil temperatures in your area and receive email alerts for key pests, sign up for automated soil temperature alerts.

For more information about spring dead spot and available control options, view the Posterity information sheet, view the spring dead spot solutions sheet or watch this GCSAA webinar on preventing spring dead spot. You can also download the GreenCast® Turf App from the Apple® App Store or the Google Play Store.

Photos are either the property of Syngenta or used under agreement.

Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations. Trials reflect treatment rates commonly recommended in the marketplace.

©2019 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties and/or may have state-specific use requirements. Please check with your local extension service to ensure registration and proper use. GreenCast®, Headway®, Posterity®, Velista® and the Syngenta logo are trademarks of a Syngenta Group Company. All other trademarks used herein are the property of their respective company.