Chemical Trials for Dollar Spot Disease Control Greens Height Turf - Summer 2004

Seven chemical and control treatments were evaluated on a 11 year old sward of Penncross7 creeping bentgrass (Agrostis palustris) at the Guelph Turfgrass Institute in Guelph, Ontario during July to October 2004 for control of dollar spot disease (caused by Sclerotinia homoeocarpa). The grass was maintained at greens height (5 mm). In addition to inoculated and uninoculated control treatments, a standard fungicide treatment, Daconil 2787 EC containing 40% chlorothalonil which is registered and recommended for control of dollar spot disease of turfgrass in Ontario was included. The treatments were applied over a 12-week period. Disease was monitored over a 13-week period. BAS 51004F 70 WG (3.14 g and 4.0 g - 14 days) and BAS 51004F 70 WG alternate with Insignia 20 WG (4.0 g alt. 28.0 g - 14 days) achieved excellent results 28 July onward. BAS 51004F 70 WG (5.57 g - 21-28 days) significantly reduced disease on 22 and 28 July and achieved excellent results for the duration on the trial. Daconil 2787 EC (190 mL - 14 days) achieved excellent control with the exception of 16 and 23 September. No phytotoxicity was observed throughout the trial.