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| Publication Type:
| Report |
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| Author(s): | Vincelli, Paul;
Doney, J.;
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: | Effects of fungicides on turf quality of creeping bentgrass, 1997 |
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| Source: | Fungicide and Nematicide Tests. Vol. 53, 1998, p. 451-452. |
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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 stolonifera; Sclerotinia homoeocarpa; Colletotrichum graminicola; Gloeocercospora sorghi; Rhizoctonia solani; Pyrenophora erythrospila; Fungicides; Disease control; Turfgrass quality; Algae; Pest control; Propiconazole; Chlorothalonil; Tank mix; Azoxystrobin; Vinclozolin; Experimental products; Myclobutanil; Cyproconazole; Iprodione; Thiophanate; Biostimulants; Surfactants; Application rates; Fosetyl Al
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| Abstract/Contents: | "Effects of fungicides on turf quality of creeping bentgrass, 1997: The experiment was conducted on turf that had not received any systemic fungicides since the 1995 growing season. The trial was mowed at 7/32 in., irrigated as needed, and fertilized with 1.5 lb N (all rates in amount/1000 ft²) as urea in Oct & Dec; and 0.5 lb N as 22-0-16 Scott's fertilizer on 21 Jul 97. Dimension herbicide was applied a 0.24 oz. Plots measured 4 X 4 ft and were arranged in a randomized complete block design with three replicates. All plots were separated by at least 2 ft 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 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 indicated until the final application on 23 Jul. Turf quality was assessed visually on a 1-9 scale. Replicated observations of phytotoxicity described below were confirmed by five observers. The intensity of plot infestation with blue-green algae was rated visually on 22 Jul, using a scale of 1 to 9. All data were analyzed using ANOVA and the Waller-Duncan k-ratio test (P=0.05, k=100). Percentage data were transformed by the angular transformation. All diseases developed from natural inoculum. Two significant abiotic stresses developed in the test area: unintended scalping by mowing during the first half of Jun, and acute drought stress during the afternoon of 10 Jul 97 (a date when several treatments had been applied). Disease pressure was unusually light for most of the summer. All of the diseases listed above occurred individually at low levels throughout July and into August, and contributed to deterioration of turf quality in control plots and occasionally in certain fungicide treatments. However, careful, repeated, and rigorous field inspections and laboratory analyses were conducted in order to reach the conclusions listed below. Among fungicide treatments, the following non-infectious factors affected turfgrass quality: 1. Enhanced turf vigor was observed in all plots treated with Aliette Signature in combination with several fungicides, especially iprodione (observed in all treated plots by 11 Jul and renaining throughout Aug). 2. Undesirable growth regulator effects was observed where DMI fungicides (Banner MAXX, Sentinel 40WG and Eagle WSP) were applied during and following a period of acute drought stress in early Jul. 3. Infestation by blue-green algae was significant in plots treated with DMI fungicides without an algicidal contact fungicide. The algal bloom occurred during the period 11 Jul-22 Jul, when efforts were made through irrigation and fertilization to help the turf recover from the acute drought stress that occurred 10 Jul. 4. Phytotoxicity was observed in plots treated with Daconil Ultrex during a period of acute drought stress on 10 Jul. Leaf blades and sheaths of tillers throughout these plots showed a tan necrosis; the symptoms were not attributable to other diseases or abiotic factors (data not shown; available upon request)." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: Biostimulants |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., J. Doney, and D. Williams. 1998. Effects of fungicides on turf quality of creeping bentgrass, 1997. Fungicide Nematicide Tests. 53:p. 451-452. |
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