Management of gray leaf spot in perennial ryegrass turf with fungicide, 2009.

摘要

The study was conducted at the Range End Golf Club, Dillsburg, PA, on perennial ryegrass maintained under fairway management conditions and mowed three times per week at 0.5-in. The experimental turf area was fertilized with 1.5 lb nitrogen (18-9-18)per 1000 sq ft on 22 May and 14 Jul. Treatment plots, 3 ft x 6 ft, were arranged in a randomized complete block design with three replications. All treatments were applied with a CO2-powered sprayer using a TeeJet 11008E nozzle at 40 psi, in water equivalent to 2 gal per 1000 sq ft. Treatment applications were made on a 14-day interval on 23 Jul, 6, 19, and 28 Aug, and 3 Sep. The experimental turf area was inoculated with M. oryzae on 9 Sep. The turf was maintained at a 2.0-inch cutting height followingthe inoculation, and mowed once a week. Disease severity was assessed on 23 Jul, 6, 18, and 28 Aug, and 3 Sep. Data were subjected to analysis of variance and multiple comparisons of the mean values were made using the Waller-Duncan k-ratio test (k=100).