Soil Temperature: Daily average 2-inch soil temperature and the 2-inch soil temperature averaged over five days are key indicators of plant growth stage (weeds and turfgrass) and soilborne disease development (see Turf Path update, April 1, 2011). The highlighted 55-60° F threshold indicates the appropriate threshold to initiate prevention for fairy ring and other soilborne diseases on golf putting greens.

Smith-Kerns Model for Dollar Spot Prediction: The Smith-Kerns Model is based on 5-day rolling averages of air temperature and relative humidity with a 20% model threshold. Tracking for this model begins April 1.

• 2-month: This chart will display the past 60-days of probabilities.
• Annual: This chart will display all probabilities for the year, it will not be available until June.

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