Full TGIF Record # 18174
Item 1 of 1
Publication Type:
i
Report
Author(s):Dernoeden, P. H.; Krouse, J. M.
Author Affiliation:Dept. of Agronomy, University of Maryland
Title:Rust control in turf with a single, spring application of fungicides, 1989
Source:Fungicide and Nematicide Tests. Vol. 45, 1990, p. 276.
Publishing Information:St. Paul, MN: American Phytopathological Society
Keywords:TIC Keywords: Poa pratensis; Rust; Penconazole; Propiconazole
Abstract/Contents:"Fungicides were applied on 26 Apr 1989 to a ten year old stand of Merion in anticipation of gathering stripe smut (Ustilago striiformis) data. Smut was a chronic problem at this site for years, but no symptoms developed in 1989. The growing season was atypically characterized by frequent period of overcast, cool and rainy weather. Rust pustules (uredia) with yellow halos, became evident in late Jul, but the Puccinia sp. did not produce terliospores and therefore could not be accurately identified. Fungicides were applied with a CO2 pressurized (38 psi) sprayer in 2.5 gal. of water per 1000 ft2. Color and quality were visually rated on a 0 to 10 scale where 0 = brown or dead turf and 10 = optimum greeness and density. Percent of leaves bearing uredia, and percent of plot area thinned by rust disease were visually determined on a 0 to 100% scale. Injury from rust became extremely severe in Sep. All fungicides had darkened turf color when plots were evaluated on 2 Jun, prior to the appearance of rust uredia. Data colelcted 31 Jul showed that all fungicides had reduced infection, but leaves from plots treated with Lynx and Spotless were nearly free of uredia. Despite a high percentage of leaves bearing uredia from Banner-treated plots (&5%), overall quality was similar to other plots treated with fungicides. The disease continued to debilitate infected plants in Aug, and by 20 Sep large differences in turf thinning and quality were evident. All fungicides reduced thinning significantly, when compared to untreated plots. Banner and SAN 619-treated plots exhibited a similar loss in density (10 to 20%); whereas, Lynx and Spotless-treated plots had 4 and 0% loss in density, respectively. Best overall quality was observed in Spotless-treated plots, followed by Lynx and SAN 619 (0.33 oz.)-treated turf. Banner and SAN 619 (0.17 oz.) treated plots exhibited quality that would be considered unacceptable for lawns maintained by professional lawn care companies."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. M. Krouse. 1990. Rust control in turf with a single, spring application of fungicides, 1989. Fungicide Nematicide Tests. 45:p. 276.
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