Graduate Thesis Or Dissertation
 

Managing Microdochium Patch Using Non-Traditional Fungicides on Annual Bluegrass Putting Greens

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  • Currently, fungicide applications are the predominant method of control for the cool weather pathogen Microdochium patch (Microdochium nivale). Increasing pesticide restrictions have generated concern regarding management of Microdochium patch. Three separate field trials exploring non-traditional fungicides were conducted between 2013 and 2015 on an annual bluegrass (Poa annua L.) sand-based putting green at the Lewis Brown Horticulture Farm, Corvallis, OR. The objective of the first project was to evaluate the effects of the cultural practice of rolling in combination with mineral oil and fertility on Microdochium patch incidence. The objective of the second trial was to quantify the effects on Microdochium patch incidence using biological control products in combination with rolling. Finally, the objective of the third experiment was to quantify the effects of different nitrogen and iron sulfate rates in combination with simulated golfer traffic on the effects of Microdochium patch incidence as well as turfgrass recuperation. The first experiment determined that rolling in combination with Civitas One or Sulfur DF + PK Plus suppressed disease to levels comparable to traditional fungicides. Civitas One with rolling resulted in abiotic damage. The second experiment determined that rolling as well as the biological control agents BW136N, followed by Rhapsody suppressed Microdochium patch disease. The third experiment determined that 4.88 Kg N ha⁻¹ combined with 97.65 Kg FeSO₄ ha⁻¹ provided the greatest combination of disease control and turf quality.
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