Preventative fungicide applications for the control of Typhula blight on creeping bentgrass, 2006-2007

摘要

Tests were conducted on a Bridgehampton silt loam located at the Skogley Memorial Turfgrass Research Facility at the University of Rhode Island. The turf was maintained at a 0.13-in. mowing height, irrigated as needed and a total of 4 lb N was appliedin four separate applications throughout the course of the season as a slow release formulation. Plots measured 3 ft x 3 ft with no borders and were arranged in a randomized complete block design with three replicates on an original mixture of 83% ‘Penncross’ and 17% ‘Penneagle’ creeping bentgrass with minimal Poa annua invasion. Fungicides were applied using a CO2-pressurized hand held sprayer fitted with TeeJet 8004VS Visiflow flat fan nozzles delivering 3.2 gal/1000 sq ft at 40 psi. Fungicides were applied on two separate occasions: Early = 31 Oct 06, Late= 30 Nov 06. No mowing occurred after the early application. Plots were inoculated with T. incarnata on 8 Dec with approximately 2.65 oz. per 25 ft2 of 12 week old infected rye. Immediately after inoculation, plots were covered with 4-in. of loose hay and covered with a lightweight porous greenscover. Plots were uncovered on 19 Apr 07 and rated.