University of Massachusetts
Dr. Gail L. Schumann
Assoc. Professor and Turfgrass Pathologist
Evaluation of fungicides for control of Dollar Spot (Sclerotinia homoecarpa) on creeping bentgrass.
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.
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.