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| Publication Type:
| Report |
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| Author(s): | Vincelli, P.;
Williams, D. |
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| Author Affiliation: | Department of Plant Pathology and Department of Agronomy, University of Kentucky, Lexington, KY |
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| Title: | Evaluation of fungicides for control of diseases of colonial bentgrass, 1997 |
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| Source: | Fungicide and Nematicide Tests. Vol. 53, 1998, p. 433-434. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Agrostis tenuis; Rhizoctonia solani; Pyrenophora erythrospila; Fungicides; Disease control; Chlorothalonil; Formulations; Triadimefon; Tank mix; Azoxystrobin; Penconazole; Application rates; Iprodione; Flutolanil; Experimental products
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| Abstract/Contents: | "Evaluation of fungicides for control of diseases of colonial bentgrass, 1997: The sward was established in Sep 94, overseeded in May 96, mowed at approx. 0.63 in., and irrigated as needed. Maintenance applications of 1.5 ob N/1000ft² as urea were made in Oct and Dec. The soil is a Maury silt loam and is maintained near pH 7. Barricade was applied at 0.24 oz/1000ft². Plots measured 4++ X 4 ft and were arranged in a randomized complete block design with three replications. All plots were separated by at least 2 ft of untreated border area. 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, followed by the fungicidal treatments (with appropriate rinses between treatments). The first sprays were applied on 3 Jun 97 (except the QS-153 treatment, which was begun 3 Jul 97). Specific spray dates for fungicide treatments were 3 Jun, 19 Jun, 25 Jun, 2 Jul, 16 Jul, and 30 Jul. Treatments were made according to the schedules indicated below. Percentage of plot surface affected by brown patch was assessed visually. Turf quality was assessed on a 1-9 scale on 4 Aug and 19 Aug. All data were analyzed using ANOVA and the Waller-Duncan k-ratio test (P=0.05, k=100). All diseases developed from natural inoculum. Disease progress was monitored both macroscopically and microscopically. Cool weather for the first three weeks of June delayed disease development until late in the month. Cool, dry weather beginning around 4 Jul stopped disease progress and allowed some turf recovery. Residual symptoms of brown patch were evaluated on 20 Jul, but no active disease was present then. During late July, symptoms of both brown patch and red leaf spot were moderately severe in untreated plots and border areas. However, these was no way to distinguish symptoms due to one disease from the other in an accurate and precise manner. An assessment of percent blighting from brown patch alone was collected on 28 Jul, when "smoke rings" were somewhat evident. However, failure to control either disease could contribute to poor quality ratings taken in August. On 28 Jul, a whitish necrosis (phytotoxicity) on blades was noted throughout all plots treated with the combination of Chipco Aliette Signature plus Caconit Ultrex. A noticeable white spray residue was evident on plots treated with Chipco Aliette Signature + Daconit Ultrex as well as those treated with CTM 90." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., and D. Williams. 1998. Evaluation of fungicides for control of diseases of colonial bentgrass, 1997. Fungicide Nematicide Tests. 53:p. 433-434. |
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