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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2000/55-493.pdf
Last checked: 05/03/2017
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | DiMarco, J. N.;
Majumdar, P. R.;
Towers, G. W.;
Weibel, E. N.;
Peacos, M.;
Clarke, B. B. |
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| Author Affiliation: | Department of Plant Pathology, Rutgers University, New Brunswick, New Jersey |
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| Title: | Evaluation of fungicides for control of dollar spot on creeping bentgrass, 1999 |
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| Section: | Turf grass reports
Other records with the "Turf grass reports" Section
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| Source: | Fungicide and Nematicide Tests. Vol. 55, 2000, p. 493-494. |
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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: Disease control; Disease severity; Quality; Application rates; Agrostis stolonifera; Sclerotinia homoeocarpa; Fungicide evaluation; Residual effects; Fungicides; Fungicide combinations; Necrosis; Golf greens
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| Cultivar Names: | Crenshaw |
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| Abstract/Contents: | "Fungicides were evaluated for their ability to control dollar spot at the Rutgers Turf Research Farm in North Brunswick, NJ on creeping bentgrass maintained under golf course greens conditions. Turf was established Sep 1996 on a Norton loam with a pH of 6.5. Mowing was performed three times weekly at a height of 0.152 in. with clippings collected. The site was irrigated as needed to prevent drought stress. Pelletized lime (20 lb./1000sq ft), was applied on 14 Apr. Fertilizer was applied as 16-4-8 on 2 Apr (1.1 lb. N/1000 sq ft), 18-4-10 on 13 May (0.7 lb. N/1000 sq ft), 16-4-8 on 15 Jun (0.46 lb. N/1000 sq ft), and 16-4-8 on 10 Aug (0.75 lb. N/1000 sq ft). Localized dry spots were controlled with Aqueduct wetting agent (6.0 fl oz/1000 sq ft) on 28 May. Betasan 4E (7 fl oz/1000 sq ft) was applied for preemergence weed control on 14 Apr. On 22 Apr, turf was aerified with 0.375 in. hollow tines on 4 in. centers. The field was topdressed with 0.125 in. of sand on 26 Apr. Chipco 26GT 2SC (3 fl oz/1000 sq ft) was applied to the entire study on 27 May and 15 Jun to suppress dollar spot and brown patch. Insect pests were controlled with Turcam 76W (1 oz/1000 sq ft) on 7 Jun, Dursban Pro 2E (1.5 oz/1000 sq ft) on 10 Aug, and Turcam 1.5G (3lb./1000 sq ft) on 14 Sep. Plots were 3 ft by 9 ft and were arranged in a randomized complete block with four replications. Fungicides were applied in water equivalent to 1.9 gal per 1000 sq ft with a CO₂ powered sprayer at 30 psi using TeeJet 8003E nozzles. Treatments were initiated on 18 Jun when environmental conditions wer conducive to dollar spot development. Fungicides were reapplied at the appropriate intervals as indicated in the table. Turf was visually evaluated for number of dollar spot infection centers per plot on 9 Jul, 19 Jul, 29 Jul (data not shown), 10 Aug, 20 Aug, 30 Aug (data not shown), 10 Sep, 22 Sep (data not shown), and 5 Oct. Data were subject to analysis of variance and means separation by Waller-Duncan k-ratio t-test (k=100). Dollar spot was first observed in early-May, but did not become evenly distributed thoughout the test until 1 Jul. Disease pressure was moderate to severe thoughout the study, with disease activity peaking in mid-Aug and early-Sep. All treatments provided acceptable control of dollar spot through 10 Sep except: the low rate of Daconil Ultrex 82.5 WDG (trt 14), Cleary 336 4.5F (trt 20), WAC 74 (trt 21), WAC 79 (trt 23), Prograss 1.5E (trt 32, 33), Prograss 1.5E + Sprint + Urea 38-0-0 (trt 34), UBI 4087 75WG (trt 36, 37), and the low rate of TM - 41702 40W (trt 42). Good to excellent residual control (36-53 days post treatment) was observed on 5 Oct for plots treated with DAS 0076 50W (trt 1), DAS 0076 250SC (trt 2, 3), DAS 0076 250E (trt 4), Lynx 45W (trt 5, 6), Lynx 45W + Daconil WeatherStik 6F (trt 16), Chipco Triton 1.67SC (trt 17, 18), Eagle 40W (trt 25-27), Banner Maxx 1.3 MC (trt 28), F-155 20W (trt 29-31), and TM-41702 (trt 39-41). The high rate of Daconil Ultrex 82.5WDG (trt 15), Spectro 90WDG (trt 19), GX-611 720F (trt 35), and Chipco 26GT 2SC (trt 38) also performed well throughout most of the study. The addition of Heritage 50WG to either Lynx 45W (trt 8), Bayleton 50W (trt 11), or Daconil Ultrex 82.5WDG (trt 13) did not enhance the incidence of dollar spot. It is also interesting to note that the combination of WAC 74 and Cleary 3336 4F (trt 22) provided excellent season-long disease control, while the component products alone (trt 21 and 20, respectively) actually enhanced the incidence of dollar spot from 30 Aug (data not shown) to 5 Oct, compared to the untreated check (trt 43). Treatments 32-34 induced severe foliar necrosis from 19 Jul to 10 Aug making disease evaluations difficult. No other phytotoxicity was observed. At the end of the study, turf quality was closely associated with the prior incidence of dollar spot (9 Jul-10 Sep). Localized dry spots were controlled wtih Aqueduct wetting agent (6.0 fl oz/1000 sq ft) on 28 May. Betasan 4E (7 fl oz/1000 sq ft)." |
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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):
DiMarco, J. N., P. R. Majumdar, G. W. Towers, E. N. Weibel, M. Peacos, and B. B. Clarke. 2000. Evaluation of fungicides for control of dollar spot on creeping bentgrass, 1999. Fungicide Nematicide Tests. 55:p. 493-494. |
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https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2000/55-493.pdf
Last checked: 05/03/2017
Requires: PDF Reader |
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MSU catalog number: SB 951.3 .F82 |
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