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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Clarke, B. B.;
Thompson, D.;
Majumdar, P. |
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| Author Affiliation: | Dept. of Plant Pathology, Cook College, New Brunswick, NJ |
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| Title: | Preventative control of brown patch in bentgrass, 1990 |
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| Source: | Fungicide and Nematicide Tests. Vol. 46, 1991, p. 293. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Agrostis; Agrostis stolonifera; Brown patch; Rhizoctonia solani; Flutolanil; Cyproconazole; Pesticides; Maintenance; Disease control; Disease evaluation; Phytotoxicity; Weed control; Research
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| Abstract/Contents: | "Fungicides were evaluated for their ability to control brown patch (Rhizoctonia solani) at the Rutgers Turf Research Station in New Brunswick, NJ. a 'Penncross' bentgrass experimental green, established Sep 1986 on a Norton loam, was used for the study. Turf was maintained at a 0.38 in cutting height throughout 1990. Nitrogen was applied as urea on 20 Apr (1.2 lb actual N/1000 ft), urea-formaldehyde on 13 Jun (1.0 lb actual N/1000 sq ft) and ammonium nitrate on 29 Jun and 19 Jul (0.75 lb actual N/1000 sq ft; each date). Turf was aerified with 0.25 in x 3 in hollow tines (2 in spacing) and then received a 0.125 in layer of Fertile soil top dressing on 11 May. Soil pH ranged from 6.5 to 6.7 over the test area. Plots were 3 ft x 9 ft and treatments were arranged in a randomized block design with four replications. Turf was irrigated as needed to avoid water stress. Weeds were controlled with 0.75 lb MCPP + 0.25 lb dicamba/A on 19 Apr and 114 lb Betasan 7G/A on 27 Apr. Fungicides were applied on 5 Jul (14 and 28 day treatments), 19 Jul (14 day treatment only), and 2 Aug (14 and 28 day treatments). Sprays were applied with a CO2 compressed air sprayer, T-jet nozzle 8003 E, adjusted to 30 psi, in water equivalent to 1.9 gal/1000 sq ft. Plots were artificially inoculated on 28 Jun with a five isolate mixture of R. solani grown on autoclaved oats to supplement natural infection. Treatments were evaluated visually for percent turf area infected with brown patch on 11 Jul, 22 Jul, 14 Aug, and 20 Aug. Data was subjected to an arc-sin transformation prior to statistical analysis. Brown patch developed rapidly after 6 Jul. By 11 Jul, infection was evenly distributed over the test area. Excellent disease control was observed with the use of Lynx 1.2E (0.83 and 1.67 fl. oz) Banner 1.1E (2.0 fl oz)+ Flutolanil 50W (2.0 oz), Rizolex 75W (4.0 oz), Flutolanil 50W (2.0 oz) + Cyproconazole 40WG (0.17 oz), Daconil 2787 4F (6.0 fl oz), NA 249 70WDG (1.78 oz), and Cyproconazole 40WG (0.33 oz). Residual activity was also good (12 to 18 days post-treatment) for all of the remaining entries except Pace 77W (7.0 oz). Lynx 25DF (0.5 oz), Bayleton 25DF (1.0 oz), Rubigan 1AS (3.0 fl oz), and ASC 66811 100 g/l E (0.3 and 0.6 fl oz), where adequate disease control was only afforded for 6 to 8 days. The combination of Banner 1.1E + Flutolanil 50W significantly improved brown patch control compared to either product alone; while Lynx 24DF and 2F were more effective when tank mixed with Penetrator 3 (8.0 fl oz). Although phytotoxicity was not observed, plots treated with Banner 1.1E (4.0 fl oz), ASC 66811 100 g/l E (0.6 fl oz), or Lynx 2F (0.5 fl oz) or Lynx 25DF (0.5 oz) + Penetrator 3 (8.0 fl oz) were noticeably greener than untreated turf in the study." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract, with table, only!
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Clarke, B. B., D. Thompson, and P. Majumdar. 1991. Preventative control of brown patch in bentgrass, 1990. Fungicide Nematicide Tests. 46:p. 293. |
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