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Applied Turfgrass Science Abstract - Applied Turfgrass Research

Long-term Trends in Meteorological Conditions Favorable for Dollar Spot in Eastern Portions of the United States

 

This article in ATS

  1. Vol. 4 No. 1
     
    Accepted: Nov 13, 2007


    * Corresponding author(s): fsr3@cornell.edu
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doi:10.1094/ATS-2007-1217-02-RS
  1. Arthur T. DeGaetanoa and
  2. Frank S. Rossi *b
  1. a Associate Professor and Director, Northeast Regional Climate Center, Department of Earth and Atmospheric Science
    b Associate Professor of Turfgrass Science, Department of Horticulture, Cornell University, Ithaca, NY 14953

Abstract

Two existing predictive models for dollar spot, caused by Sclerotinia homoeocarpa F.T. Bennet, were modified to a single model to accept archived National Weather Service hourly meteorological observations. The revised model was used to identify trends in the potential for dollar spot epidemics from 1950-2004. The frequency of meteorological conditions conducive to dollar spot has increased at the majority of nearly 100 sites in the northeastern quadrant of the United States. Statistically significant trends in favorable weather conditions for dollar spot existed across the region with the greatest trends in the Southeast and Midwest sub-regions. Compared to 1975, these areas on average experienced 24 more days in 2004 that were more favorable for dollar spot occurrence. It appears that the increase in favorable conditions for dollar spot epidemics was best explained by rainfall frequency. Increased disease pressure could require additional fungicide inputs to maintain high quality golf turf plagued with dollar spot.

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