Evaluation of multiple fungicides in combination with a wetting agent for spring dead spot control on bermudagrass, 2013-2014

摘要

Fungicides were evaluated for the control of a natural infestation of spring dead spot caused by Ophiosphaerella herpotricha at the University of Missouri Turfgrass Research Facility in Columbia, MO on 'Riviera' bermudagrass. The soil was a Mexico silt loam. Mowing was performed two times weekly at a height of 0.75-in. During the trial period, no fertilizer was applied. Plots were 5 ft x 10 ft and arranged in a randomized complete block with four replications. Treatments were applied in water equivalent to 2.0 gal per 1000 sq ft with a CO2-powered sprayer at 26 psi using TeeJet 8008 nozzles. Fungicides were watered-in immediately after application with 0.2-in. of irrigation. Disease severity and turfgrass quality were assessed every 14 days from initial symptom development. Disease severity was assessed as a visual estimate of the percent symptomatic area 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 by Fisher's Protected LSD (P = 0.05).