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Localized Dry Spots on Turfgrass

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LDS may also occur on mineral soils ... Primer 604 significantly improved water retention in soils with LDS ... LDS ... – PowerPoint PPT presentation

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Title: Localized Dry Spots on Turfgrass


1
Localized Dry Spots on Turfgrass
2
What is a Localized Dry Spot?
  • Localized Dry Spots hot spots, isolated dry
    spots
  • Soils which have become water repellent
  • Most common in high sand situations like USGA
    greens and similarly constructed areas
  • LDS may also occur on mineral soils

3
From http//www.agcsa.com.au/atm/articles/vol46/d
ryspot.htm
4
Coated vs. non-coated soil
From http//www.agcsa.com.au/atm/articles/vol46/d
ryspot.htm
5
What is a Localized Dry Spot?
  • Causes
  • microbial decomposition of organic substances
    (peat, roots, shoots)
  • Fungal activity and frequent wet-to-dry cycles,
  • can produce a wax-like and water repellent
    coating on sand particles. (Leinauer 2002)

6
LDS incitants
  • Hydrophobic materials may include
  • accumulated plant-derived organic matter (thatch,
    decomposing roots, decomposing plant tissues, and
    root exudates)
  • plant-derived waxes and organic acids
  • fungal hyphae
  • microbial organic acids and polysaccharides
    (Kostka 2000)

7
LDS
  • Studies of two wetting agents Primer 604 and
    Midorich to combat LDS were performed recently
  • Primer 604 significantly improved water retention
    in soils with LDS
  • Midorich did not significantly improve water
    retention in soils with LDS
  • http//www.uoguelph.ca/GTI/99anrep/99r_4.pdf
  • http//www.paceturf.org/index.php

8
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9
LDS
  • It was suggested by the researchers that
    increased water retention following treatment
    with wetting agents was due to
  • 1) Greater retention of fine soil particles in
    the root zone
  • 2) A hydrophilic coating on the soil particle
    created by the wetting agent

10
(No Transcript)
11
Wetting agent studies
  • http//www.gcsaa.org/GCM/2005/aug05/PDFs/071-083_W
    ettingAgent.pdf
  • http//www.eifg.org/focus/research/wetting_agents/
    index.asp

12
LDS
  • In another study researchers looked at the
    wetting agents Respond and Primer in combination
    with the fungicides Heritage and Prostar.
  • The fungus Agrocybe pediades (as well as other
    basidiomycetes) has been found in association
    with LDS and fairy ring

13
LDS
  • Heritage Respond and Prostar Respond provided
    the best management of LDS and fairy ring (Type B
    and C)
  • Type B fairy rings generally cause little damage
    due to hydrophobic conditions while type C fairy
    rings cause extensive damage
  • Respond or Primer both managed LDS and type C
    fairy ring when combined with fungicides in this
    study

14
Type C fairy ring- from http//www.interactiveturf
.com/pest/20020715_Fairy_ring_LDS.htmPhoto5
15
From http//www.interactiveturf.com/pest/20020715
_Fairy_ring_LDS.htmPhoto5
16
References
  • Kostka, S.J. 2000. Amelioration of water
    repellency in highly managed soils and
    enhancement of turfgrass performance through the
    systematic application of surfactants. Journal of
    Hydrology 231-232359-368.
  • Leinauer, B. 2002. Wetting agents and their
    impact on water retention of turfgrass root
    zones. Australian Turfgrass Management Volume
    4.1.
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