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| Publication Type:
| Report |
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| Author(s): | Tredway, L. P.;
Clarke, B. B.;
Towers, G. W.;
Weibel, E. N.;
Majumdar, P. R. |
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| Author Affiliation: | Department of Plant Pathology, Rutgers University, New Brunswick, NJ |
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| Title: | Evaluation of fungicides for control of brown patch, 1998 |
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| Source: | Fungicide and Nematicide Tests. Vol. 54, 1999, p. 484-485. |
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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; Disease control; Brown patch; Rhizoctonia solani; Fungicide evaluation; Application rates; Application frequency; Disease severity
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| Abstract/Contents: | "Fungicides were evaluated for their ability to control brown patch at the Rutgers Turf Research Farm in North Brunswick, NJ on colonial bentgrass maintained under golf course fairway conditions. The turf was established Sep 1995 on a North loam with a pH of 6.1. Mowing was performed three times weekly at a height of 0.4 in. with clippings collected, and the site was irrigated to prevent drought stress. Fertilizer was applied as 20-0-20 on 1 Apr (0.5 lb N/1000 sq ft), 46-0-0 on 1 May (0.25 lb N/1000 sq ft), and 16-4-8 on 14 Jul (0.5 lb N/1000 sq ft). Insect pests were suppressed with Dursban Pro 2E (2 oz/1000 sq ft) on 6 Jul. Daconil Ultrex 82.5WDG (2.9 oz/1000 sq ft) was applied on 15 Jun to reduce a dollar spot infestation. Primer wetting agent (4 fl oz/1000 sq ft) was applied on 8 Apr, 2 Jun, and 29 Jun and Aquaduct wetting agent (6 fl oz/1000 sq ft) was applied on 30 Jul to control localized dry spots. Solid tine aerification was performed on 24 Jul with 0.375 in. tines on 2 in. centers. Water injection cultivation was performed on 29 Jul with a Toro Hydroject (11.2 gallons water per 1000 sq ft at 5000 psi). Plots were 3 ft x 9 ft and were arranged in a randomized complete block with four replications. Fungicides were applied in water equivalent to 2 gal per 1000 sq ft with a CO₂ powered sprayer at 30 psi using TeeJet 8003E nozzles. Treatments were initiated on 25 Jun, except treatments 48-57, which were initiated on 22 Jul. Fungicides were reapplied at the appropriate intervals as indicated in the table. Percent turf area infested with R solani was assessed on 20 Jul, 22 Jul (data not shown), 6 Aug. 12 Aug, 1 Sep, and 18 Sep. Data were subjected to analysis of variance and means seperation be Waller-Duncan k-ratio t test (k=100). Brown patch infection was first observed on 13 Jul. Disease pressure was moderate but consistent throughout Jul and Aug. On 20 Jul, excellent brown patch control was obtained with all treatments except for the low rates of BAS505F 50DF (trt 24) and RU011322 (trt 30). On 6 Aug, 14 and 21 day treaments were at the end of their application intervals. On that date, plots treated with Medallion 50W + Primo L 1E (trt 7), low rates or long application intervals of Daconil WeatherStik 6F (trt 13, 15), Prostar 70W (trt 16, 17), and the 0.15 oz and 0.22 oz rates of BAS505F 50DF (trt 24, 25), AE B066752 (trt 29), RU011322 (trt 30, 31), Eagle 40W (trt 38), Fore 80W (trt 39), and the low rate of S-8172 (trt 43) had significantly more disease than those treatments providing the best level of control. Many treatments continued to provide excellent residual control on 12 Aug, 1 Sep, and 18 Sep even though the application intervals had been significantly extended. Of the treatments involving curative applications (trt 48-57), Heritage 50 WG (trt 56, 57) applications reduced brown patch infection to acceptable levels by 6 Aug. Treatments of RU181603D 4SC (trt 52, 53) and Chipco Triton 1.67SC (trt 54, 55) reduced disease to acceptable levels by 12 Aug and 1 Sep, respectively." |
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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):
Tredway, L. P., B. B. Clarke, G. W. Towers, E. N. Weibel, and P. R. Majumdar. 1999. Evaluation of fungicides for control of brown patch, 1998. Fungicide Nematicide Tests. 54:p. 484-485. |
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