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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2007/T018.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Kaminski, J. E.;
Putman, A. I. |
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| Author Affiliation: | Department of Plant Science, University of Connecticut, Storrs, Connecticut |
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| Title: | Early curative dollar spot suppression with various fungicides and plant defense activators, 2006 |
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| Source: | PDMR: Plant Disease Management Reports. Vol. 1, 2007, p. T018. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Fungus control; Dollar spot; Fungicides; Fungicide trials; Agrostis stolonifera; Poa annua; Golf fairways; Disease severity
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| Abstract/Contents: | "This field study was conducted Stanley Golf Club located in New Britain, CT. The turf was a mixed stand of creeping bentgrass (Agrostis stolonifera) and annual bluegrass (Poa annua) that was maintained at fairway height. Plots measured 5 ft x 5 ft, and were arranged as a randomized complete block with four replications. Fungicides were applied with a CO2-pressurized (35 psi) sprayer equipped with a flat-fan nozzle (8010E), and calibrated to deliver 2.5 gal water per 1000 ft2 Turf was maintained at 0.50-in. and irrigated as needed-. Dollar spot severity was assessed by visually estimating the percent plot area affected by S. homoeocarpa. Percent dollar spot was rated visually on a 0 to 100 percent scale where 0 = no visible dollar spot symptoms and 100 = entire plot area discolored by S. homoeocarpa. Dollar spot became active at the study site in late May. Except for Emerald treatments applied on 23 May, all plots had trace levels of dollar spot when treatments were initiated on 6 Jun. On 20 Jun (2 weeks after treatment; WAT), all plots had an average of between 0 and 6.5% dollar spot and there were no differences among any treatment and the untreated control. Disease pressure became severe in late-Jun and early-Jul. On 5 Jul, 26% of the untreated control plots were damaged by dollar spot. Treatments providing acceptable (ā¤ 1%) suppression of dollar spot on 5 Jul included preventive applications of Emerald (0.13 oz and 0.18 oz) and early curative applications of Actigard + Banner MAXX + Daconil Ultrex, Spectator Ultra + Manicure Ultra, SP10200004941, and Daconil + Banner MAXX. There were no statistical differences, however, among the aforementioned treatments and those plots treated with SP2016 + Banner MAXX (6%), Actigard + Daconil Ultrex (8%), Actigard + Banner MAXX (4%), Daconil Ultrex (6%), Banner MAXX (10%), Spectator Ultra (2% and 19%), Manicure Ultra (2%), Bayleton (10%), and Emerald (2% and 7%). Disease severity increased until mid to late Jul, after which time percent dollar spot in the untreated control plots leveled off to between 33% and 42%. On all rating dates, little to no suppression of dollar spot was achieved in plots treated with SP2016, Actigard, or 3336F. Resistance of S. homoeocarpa isolates from this study site to thiophanate-methyl (3336F) was confirmed via in vitro fungicide assays." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is as abstract and tables only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kaminski, J. E., and A. I. Putman. 2007. Early curative dollar spot suppression with various fungicides and plant defense activators, 2006. PDMR: Plant Dis. Manage. Rep. 1:p. T018. |
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Last checked: 11/14/2016
Requires: PDF Reader |
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