Fungicides for disease suppression and turfgrass quality on a creeping bentgrass putting green in Kansas, 2016

摘要

The study was conducted on a stand of a 'Cato + Crenshaw' blend of creeping bentgrass at the Rocky Ford Turfgrass Research Center in Manhattan, KS. The green was maintained at a mowing height of 0.156 inches on Chase silt loam. The experiment was setup as a randomized complete block design with four replications. Individual plots were 4 ft x 5 ft. Fungicides were applied using a hand-held CO2 sprayer equipped with two 8004VS nozzles applied in 2 gal of water per 1,000 sq ft. Fungicides were appliedat 21 day intervals on 29 Jun, 20 Jul, and 10 Aug 16. Dollar spot and brown patch were assessed by visually estimating the percentage of each plot area exhibiting symptoms. Quality (based on color, uniformity, phytotoxicity, but excluding disease symptoms) was rated every 4 to 12 days on a 1-9 scale, with 6 = minimally acceptable quality. Data were subjected to an analysis of variance using PROC MIXED in SAS 9.4 and treatment means were separated using the Bonferroni adjustment (a=0.05). Data were ln transformed for analysis and back-transformed for presentation.