Dollar spot suppression and performance of fertility programs on creeping bentgrass fairway turf - 2010 season
The objective of this research project was to determine the effects of the sponsor's fertilizer programs on dollarspot disease and general performance of creeping bentgrass putting green turf maintained at fairway height. Two experiments were involved in this trial. The first included 9 treatments which were a combination of two fertility programs and five fungicide programs. An unfertilized check treatment was also included. The second involved three treatments (CSN, UMAXX, and Tru-Prill 16-2-15) with an untreated control. Treatments were applied to 1 x 2 m plots of creeping bentgrass turf maintained as a fairway at the Guelph Turfgrass Institute (mowing at 9 mm, irrigation to prevent stress). While the treatments in Part 1 with NPK fertility included generally performed better with respect to canopy reflectance than fungicide, fungicide/amendment, or untreated control, the difference was not strong. The rank order of the treatments taking the seasonal mean of canopy reflectance was: Tru-prill+fung 2, Tru-prill+fung 1 > CSN, Fungicide 3 > Fungicide 1 >Tru-prill > Tru-prill+fung 3, Fungicide 2, Untreated control > Fungicide 4. All treatments in Part 2 had significantly better canopy reflectance than the control week after application. This pattern persisted for about a month, at which point the effect of CSN and the Mineral Builder treatments were not statistically different from the control. The rank order of these treatments taking the seasonal mean of canopy reflectance was: UMAXX, CSN > Mineral Builder > Untreated control.