University of Massachusetts
Dr. Gail L. Schumann
Assoc. Professor and Turfgrass Pathologist
Amherst, MA
Objective:
Evaluation of fungicides for control of Dollar Spot (Sclerotinia homoecarpa) on creeping bentgrass.
Method:
Plots were treated at 14 day interval beginning in May. Mowing height was 0.25 in. Fungicides were
applied with CO2 backpack sprayer in water equivalent to 2 gal / 1000 sq. ft at 30 psi. Companion®
was applied at a rate of 4 oz. in combination with Daconil Ultrex 82.5WG at the low label rate of
1.82 oz. / 1,000 sq. ft. Daconil Ultrex was also applied as a stand-alone application at the same
1.82 oz rate.
Results:
Dollar spot was observed near end of June. All treatments gave commercially control of Dollar Spot.
Comparison of the Daconil Ultrex alone and the combined treatment of Companion® and Daconil showed
a synergistic effect in the combined treatment during the month of August of between 50% to 56%
additional reduction in disease over the Daconil alone. Overall reduction of disease over the
non-treated control was 93% to 99% during the month of Aug.
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