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What to expect from plant growth regulators

Micah Woods
November 20, 2018

What to expect from plant growth regulators

This seminar was held at Manila Southwoods Golf and Country Club at a seminar organized by Nutranta Inc.

I explained what to expect from the use of plant growth regulators in the Philippines, specifically related to effects on plant health, turf quality, and resource requirements. I close by discussing application timing.

Micah Woods

November 20, 2018
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  1. What to expect from plant growth regulators
    Micah Woods
    November 20, 2018
    Chief Scientist
    Asian Turfgrass Center
    www.asianturfgrass.com

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  2. What has the potential to occur?
    from “Insecticides, fungicides, herbicides, and growth regulators used in turfgrass
    systems,” Reicher et al., 2013
    • improve heat stress tolerance
    • improve performance in shade
    • increase green speed
    • decrease sod heating
    • improve density and color
    • increase drought and heat tolerance
    • delay fall dormancy of warm-season grasses
    • hasten spring green-up

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  3. What has the potential to occur?
    • improve heat stress tolerance
    • improve performance in shade
    • increase green speed
    • decrease sod heating
    • improve density and color
    • increase drought and heat tolerance
    • delay fall dormancy of warm-season grasses
    • hasten spring green-up
    • reduced mowing requirement
    • reduced nutrient requirement
    • reduced water requirement

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  4. from Reicher et al., 2013

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  5. Today’s outline
    1. Healthier plants
    2. Better playing conditions
    3. Lower resource use
    4. Optimal application scheduling

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  6. 1. Healthier plants

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  7. Manila Golf Club

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  8. Manila Golf Club, February 2013

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  9. Manila Golf Club, February 2013

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  14. • slower growing
    • improved stress tolerance
    • improved shade tolerance
    • more efficient photosynthesis

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  16. Table 1 from Grime, 1977

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  17. 2. Better playing conditions

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  18. More plant density
    manilagrass at Keya GC, Japan

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  19. Tolerance to lower mowing
    manilagrass at Keya GC, Japan

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  20. Improved performance in shade
    manilagrass at Keya GC, Japan

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  21. Possible root enhancement
    manilagrass at Keya GC, Japan

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  22. 3. Lower resource use

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  23. The growth rate is slower, so there can be …
    less mowing
    Peak clipping yield suppression at label rates is about 50% of untreated. Mowing
    frequency reduction may be possible.

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  24. The growth rate is slower, so there can be …
    lower CO
    2
    emissions
    Mowing fairways on an average 18 holes produces about 92 kg of CO
    2
    . With 150
    fairway mows a year, that’s almost 14 tons of CO
    2
    .

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  25. The growth rate is slower, so there can be …
    lower irrigation water use

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  27. “by using a surfactant, a PGR, or both, bermudagrass
    quality can be maintained with 15 to 30% less irrigation
    water …without a reduction in color or quality.”
    Serena et al., 2018

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  28. 4. Optimal application scheduling

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  29. How much growth reduction?
    “Peak suppression values after a [trinexapac-ethyl] application at 0.034
    kg a.i. ha-1 [280 mL/ha] in this study ranged from 49 to 62%”
    Reasor et al., 2018

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  31. When does the growth reduction happen?
    “Peak suppression occurred between 166 and 177 GDD calculated using
    10°C as the base temperature (GDD10C
    )”
    Reasor et al., 2018

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  32. Figure 1 in Reasor et al., 2018

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  33. from Figure 1 in Reasor et al., 2018

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  36. Recommended reapplication interval
    Based on the suppression of ultradwarf bermudagrass, Reasor et al. suggest a
    reapplication interval of 216 to 230 accumulated GDD10C
    .
    In days, with Manila weather,
    that works out to reapplication every 12 days on average to maintain consistent
    growth regulation.

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  37. https://greenkeeperapp.com

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  43. https://greenkeeperapp.com

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  44. Minimal use recommendation
    • 3 applications prior to tournament
    • first app 33 days before tournament
    • second app 21 days before tournament
    • final app 9 days before tournament

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  45. For more, please see www.asianturfgrass.com.

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