Evaluation of multiple fungicide programs for disease control on fairway height creeping bentgrass, 2014

摘要

Fungicides were evaluated for preventative brown patch and dollar spot control at the University of Missouri Turfgrass Research Facility in Columbia, MO on 'Penneagle II' creeping bentgrass grown on a native soil (Mexico silt loam). Mowing was performed two times weekly at a height of 0.55-in. from 2 Apr to 19 Sep. Starting on 16 May to 8 Aug, UMaxx~R (47-0-0) at 0.375 lb N/1000 sq ft + Ferromec (10-2-4) + micros (0.015 lb N/1000 sq ft) was applied every three weeks. Plots were 5 ft x 5 ft and arranged in a randomized complete block design with four replications. Treatments were applied in water equivalent to 2 gal/1000 sq ft with a CO_2-powered sprayer at 26 psi using TeeJet 8008 nozzles. On 23 May, rye grain infested with the dollar spot pathogenwas uniformly applied at a volume of 1.52-in.3 per plot using a small broadcast spreader and left on the turf surface for 3 days before mowing. Disease severity and turfgrass quality were assessed every 14 days from initial symptom development. Disease severity was assessed as a visual estimate of the percentage of plot displaying brown patch symptoms. Dollar spot incidence was based on the number of infection centers per plot. Turfgrass quality was evaluated using a 1 to 9 scale (9=best, 5=acceptable)based on color, density, and uniformity. Data were subjected to analysis of variance and means separation using Fisher's Protected LSD (P=0.05).