Full TGIF Record # 55639
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Publication Type:
i
Report
Author(s):Vincelli, Paul; Doney, J.; Williams, D.
Author Affiliation:Department of Plant Pathology and Department of Agronomy, University of Kentucky, Lexington, KY
Title:Evaluation of fungicides for control of dollar spot of creeping bentgrass, 1997
Source:Fungicide and Nematicide Tests. Vol. 53, 1998, p. 453-454.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:2
Keywords:TIC Keywords: Agrostis stolonifera; Sclerotinia homoeocarpa; Disease control; Fungicides; Propiconazole; Chlorothalonil; Tank mix; Azoxystrobin; Vinclozolin; Experimental products; Myclobutanil; Application rates; Cyproconazole; Iprodione; Thiophanate; Biostimulants; Surfactants; Fosetyl Al
Abstract/Contents:"Evaluation of fungicides for control of dollar spot of creeping bentgrass, 1997: The experiment was conducted on turf that had not received any systemic fungicides since the 1995 growing season. The soil is a Maury silt loam and is maintained near pH 7. The trial was mowed at 0.22 in., irrigated as needed, and fertilized with 1.5 lb N (all rates in amount/1000 ft²) as urea in Oct and Dec; and 0.5 lb N as 22-0-16 Scott's fertilizer on 21 Jul 97. Dimension herbicide was applied at 0.24 oz. Plots measured 4ft X 4 ft and were arranged in a randomized complete block design with three replications. All plots were separated by at least 2 ft untreated border area. In order to test whether the surfactant R-11 had any disease-suppressive effects, that product was applied by itself to three plots located along the East edge of the trial. While data were usually collected from these plots and included in the analyses, these plots were not randomized within the trial. Based on previous observations, there is a possibility of a gradient of decreasing dollar spot pressure as well as increasing turf vigor going from West to East in this sward. Thus, use caution in making inferences about R-11 only. Plots were sprayed with a CO₂ -powered hand-held sprayer fitted with Spray Systems 8003E flat fan nozzles delivering 2.5 gal/1000 ft² during early morning hours. Control plots were treated with water, then biostimulant treatments, followed by the Heritage/Biotrek treatment, followed by the remaining fungicidal treatments (with appropriate rinses between all treatments). Treatments were initiated on 30 May 97 (escept Biopak WSP, which was first applied on 15 May) and were continued according to the schedules indicated until the final application on 23 Jul. Dollar spot infection centers of dime size or larger were counted weekly; because of space considerations, selected data are presented. All data were analyzed using ANOVA and the Waller-Duncan k-ratio test (P=0.05, k=100), following transformation (natural log). All diseases developed from natural inoculum. Note that natural log-transformed means are presented in the table. Dollar spot pressure was unusually light for most of the summer; by 21 Aug, dollar spot pressure was moderate. Severe dollar spot pressure typical for this site did not develop at any time during the experiment. Treatments with different spray intervals received their last spray on different dates. This notwithstanding, differences in dollar spot control among treatments by 21 Aug may be the result of several phenomena, including differences in residual activity among the products tested, and possibly differenced in effectiveness in controlling primary infections or controlling pre-symptom pathogen activity. Phytotoxicity and other effects are noted in an accompanying report."
Language:English
References:0
See Also:Other items relating to: Biostimulants
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., J. Doney, and D. Williams. 1998. Evaluation of fungicides for control of dollar spot of creeping bentgrass, 1997. Fungicide Nematicide Tests. 53:p. 453-454.
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