Friday, September 22, 2017

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Research From Virginia Tech

  • Season-Long Performance of Various Spray Programs on Golf Greens (2008).

    Season-Long Performance of Various Spray Programs on Golf Greens (2008).

    Adverse environmental conditions such as high heat, drought, and/or salinity combined with low mowing heights and disease pressure often leads to ‘summer stress syndrome’ in the transition zone and northern climates where cool season grasses are managed.  This general malaise of creeping bentgrass includes a general decline in turf vigor, limited root function, poor recuperative capacity, and increased disease pressure.  Low dose and frequent fertilizer inputs and the use… Read More +

  • Field Evaluation of Phosphite-Based Products Challenged with Heat Stress and Pythium (2008).

    Field Evaluation of Phosphite-Based Products Challenged with Heat Stress and Pythium (2008).


    Pythiumspp. cause many diseases of turfgrass roots and/or foliage including Pythium blight, root dysfunction, and damping-off.Cool-season grasses are most commonly damaged by pythium blight in hot, humid conditions including high night time temperatures with high humidity and in poorly drained areas.Potassium phosphite (KH2PO3) is an alkaline salt of phosphonic acid and has been shown in previous research trials to suppress pythium blight and improve… Read More +

  • Field Evaluation of Phosphite-Based Products Challenged with Heat Stress and Pythium (2007)

    Field Evaluation of Phosphite-Based Products Challenged with Heat Stress and Pythium (2007)

    Pythium spp. cause many diseases of turfgrass roots and/or foliage including Pythium blight, root dysfunction, and damping-off. Cool-season grasses are most commonly damaged by pythium blight in hot, humid conditions including high night time temperatures with high humidity and in poorly drained areas. Potassium phosphite (KH2PO3) is an alkaline salt of phosphonic acid and has been shown in previous research trials to suppress pythium blight… Read More +

  • Physiological Effects of Phosphite Formulations on Turfgrass Challenged with Pythium and Heat Stress. Year II (2006)

    Physiological Effects of Phosphite Formulations on Turfgrass Challenged with Pythium and Heat Stress. Year II (2006)

    Objectives:
    Determine whether formulation is important in terms of phosphite source and additives for control of Pythium blight.
    Determine impact of phosphite based products on turf quality and color.
    Confirm whether phosphite based products reduce algae cover on greens.

    Field Locations:
    Sand-based Penn A4 creeping bentgrass green at TRC, Blacksburg
    USGA Penn A1 & Penn… Read More +

  • Physiological Effects of Phosphite Formulations on Turfgrass Challenged with Pythium and Heat Stress (2005)

    Physiological Effects of Phosphite Formulations on Turfgrass Challenged with Pythium and Heat Stress (2005)


    Background:
    *Estimated in 2003 that over $400 million spent on fungicides for disease control on US golf courses; for all sectors the cost must be close to $1 billion/yr.
    *Pythium blight is one the most potentially devastating summer diseases of cool-season grasses.
    *Chipco Signature™ (fosetyl-Al) is a very popular fungicide for pythium blight… Read More +
  • Field evaluation of phosphite-based products challenged with heat stress and Pythium (2005)

    Field evaluation of phosphite-based products challenged with heat stress and Pythium (2005)


    Rye

    Objective: Field evaluation of phosphite-based products challenged with heat stress and Pythium.

    Conclusions: This site was an in-play golf course fairway consisting of perennial
    ryegrass. There were virtually no differences in turf color or density. Reduction in turf quality was due primarily to injury caused by… Read More +

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