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Management of ultradwarf bermudagrass greens: what to expect, & what to watch out for

C62291821dac0dd5b7ef3b72a30cd137?s=47 Micah Woods
October 20, 2015

Management of ultradwarf bermudagrass greens: what to expect, & what to watch out for

Slides for my presentation on this topic at the 2015 Japan Turf Show. In the presentation, I discussed the framework for growth and what management of the turf is required in the Tokyo climate to produce high performance putting surfaces.

C62291821dac0dd5b7ef3b72a30cd137?s=128

Micah Woods

October 20, 2015
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  1. Management of ultradwarf bermudagrass greens: what to expect, & what

    to watch out for Micah Woods Chief Scientist Asian Turfgrass Center www.asianturfgrass.com 22 October 2015
  2. Management is similar to bent, but easier ▶ ultradwarf thrives

    in hot weather with full sunshine ▶ when bentgrass is dying in the summer, ultradwarf is at its best ▶ fungal diseases must be prevented on ultradwarf during the rainy season and in autumn ▶ when grown in a shaded environment, the mowing height should be increased, the N rate reduced, and the use of growth regulators continued ▶ the green speed and green firmness of ultradwarf may be superior to bentgrass
  3. Champion, Saitama, July 2015

  4. Champion, Yamaguchi, September, 3 months aer planting

  5. The same principles apply to all grasses “If turfgrass growth

    were a recipe, these are the ingredients:” Handout link
  6. 0 10 20 30 Jan 2014 Apr 2014 Jul 2014

    Oct 2014 Jan 2015 Mean daily temperature, ℃ Tokyo 2014
  7. 0.00 0.25 0.50 0.75 1.00 Jan 2014 Apr 2014 Jul

    2014 Oct 2014 Jan 2015 C4 growth potential (GP) Tokyo 2014
  8. 0.00 0.25 0.50 0.75 1.00 Jan 2015 Apr 2015 Jul

    2015 Oct 2015 Jan 2016 C4 growth potential (GP) Tokyo 2015
  9. Khao Yai, Thailand

  10. Kolkata, pythium or leaf spot, December

  11. Pythium or leaf spot, Saitama, July

  12. 91 36 87 0 5 10 15 20 0 10

    20 30 40 50 60 Daily light integral (DLI) count DLI at Tokyo from 1 Apr to 31 Oct 2014
  13. 0 10 20 30 40 50 60 Apr May Jun

    Jul Aug Sep Oct Nov Daily light integral (DLI), mol m-2 d-1 Tokyo 2014
  14. 0 10 20 30 40 50 60 Apr May Jun

    Jul Aug Sep Oct Nov Daily light integral (DLI), mol m-2 d-1 Tokyo 2014
  15. 10 20 30 40 50 60 Apr May Jun Jul

    Aug Sep Oct Nov Daily light integral (DLI), mol m-2 d-1 Tokyo 2015
  16. 0 1 2 3 4 5 6 Jan 2014 Apr

    2014 Jul 2014 Oct 2014 Jan 2015 Reference evapotranspiration (ETo ), mm Tokyo 2014
  17. 0 1 2 3 4 5 6 Jan 2015 Apr

    2015 Jul 2015 Oct 2015 Jan 2016 Reference evapotranspiration (ETo ), mm Tokyo 2015
  18. central Japan

  19. central Japan

  20. Florida

  21. 10 cm profile, Chiba

  22. Bangkok

  23. 0 1 2 3 4 1 2 3 4 5

    6 7 8 9 10 11 12 Month Estimated use, g m-2 mo-1 K N Tokyo 2014
  24. 0 1 2 3 4 1 2 3 4 5

    6 7 8 9 10 11 12 Month Estimated use, g m-2 mo-1 K N Tokyo 2014
  25. Topdressing in Thailand, November

  26. Singapore, October, with green speed > 12 feet

  27. Summary of data I’ve collected from 87 bermuda greens and

    108 bent greens ▶ The median green speed is 9.0 feet for bermuda (old types and ultradwar) and 8.7 feet for bent. ▶ For ultradwarf bermudagrass only, the speed is expected to be even faster. ▶ The firmness of the greens is similar, with a median Clegg reading of 87 gravities for bermuda and 86 gravities for bent.