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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/PDMR/reports/2011/T046.pdf
Last checked: 11/14/2016
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| Publication Type:
| Report |
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| Author(s): | Golembiewski, R. C.;
McDonald, B. W. |
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| Author Affiliation: | Department of Horticulture, Oregon State University, Corvallis, OR |
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| Title: | Evaluation of fungicides on turfgrass quality of an annual bluegrass putting green in western Oregon, 2010 |
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| Section: | Turfgrass
Other records with the "Turfgrass" Section
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| Source: | PDMR: Plant Disease Management Reports. Vol. 5, 2011, p. T046. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Anthracnose; Colletotrichum graminicola; DMI fungicides; Fungicide combinations; Fungicide trials; Golf greens; Poa annua; Quality evaluation
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| Abstract/Contents: | "The objective of this study was to evaluate the effects of fungicides on turfgrass quality of an annual bluegrass putting green during summer. The trial was conducted on an annual bluegrass putting green located at Oregon State University's Lewis-Brown Horticulture Farm in Corvallis, Oregon. The first 20 fungicide treatments listed in the table below were initiated on 17 Jun. Of these, all but Headway G applied at 64 oz and Renown SC applied at 4.5 fl oz were applied every 2 weeks. Headway G applied at 64 oz and Renown SC applied at 4.5 fl oz were applied every 3 weeks. The last four treatments listed in the table below were initiated on 24 Jun and were applied on various schedules (see application code for individual application schedules). The putting green was constructed using the California method where 12 in. of straight USGA sand was placed on a soil sub grade over flat drainage. Poa annua cores were taken from Emerald Valley Golf Course located in Cresswell, Oregon and were spread on top of the sand base in early May of 2009. The green was topdressed weekly throughout the summer of 2009 to smooth the surface. The green in 2009 was mowed at 0.150 in. and otherwise maintained in accordance with golf course putting green standards. In 2010, the mowing height was reduced to 0.095 in. before the trial began. The green was mowed with a Toro Flex walking greens mower. One fertilizer application was made during the trial on 14 Jul 10 applying 0.25 lb of nitrogen per 1,000 sq ft from Anderson's 28-5-18 + micros fertilizer. Irrigation was initially applied at 80 percent of ET calculated from an on-site weather station and then subsequently reduced to induce drought stress. The drought stressed areas were hand watered daily to prevent turf damage. Sprayable fungicide treatments were applied with a CO2-powered two-wheeled sprayer with a 5 ft boom using TeeJet 80015 nozzles spraying 2 gallons of spray solution per 1,000 sq ft at 30 psi. Speed was calibrated with a KORG MA-30 metronome. Due to the difficulty of applying small amounts of granules evenly across a plot, granules were mixed with screened cat litter to bulk up the sample size and assist in even particle distribution. Turf quality ratings were based on digital photographs taken with a Sony DSC-H1 camera mounted on a light box outfitted with four 9-watt SpringLamp compact fluorescent bulbs (Model #2890965K). The digital photographs were analyzed with Sigma Scan Pro software from SPSS, Inc. to estimate turfgrass quality. Data were subjected to analysis of variance using a randomized complete block design with 3 replications. Differences between means were determined by Fisher's Protected LSD (α= 0.05). Although anthracnose symptoms did not develop during this trial, there were significant differences in plot quality. The Quali-Pro Foursome spray indicator applied alone was among the best treatments in this trial. Additionally, Foursome was applied with Fosetyl-Al and Fosetyl-Al mixed with two different formulations of chlorothalonil, respectively. These three treatments, along with Signature mixed with Daconil Ultrex were among the best turf quality. The plots treated with Reserve, which also included the StressGard pigment, had good turf quality, but not among the best, because of a PGR effect as explained below. Also, near the top of the turf quality ratings were two treatments of Renown SC. Additionally, plots treated with spray program 1 had excellent turf quality. The DMI fungicides in this trial generally caused some reduction in turf quality. Additionally, there was a 3 day period of hot weather - 7 Jul through 9 Jul - where temperatures reached 93 degrees Fahrenheit which may have exacerbated the effects of the DMI fungicides. Plots treated with Tourney 50 WDG applied at 0.37 oz had severe phytotoxicity after two applications. Torque and Trinity applied every two weeks also caused phytotoxicity, but the turf injury was not as severe as the plots treated with Tourney. Torque alternated with Affirm + Spectro 90 did not cause phytotoxicity. Plots treated with Honor WDG and Insignia SC had good turf quality, but not among the best. This trial illustrates the problems that may result from repeated applications of DMI fungicides during the summer months." |
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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!
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Golembiewski, R. C., and B. W. McDonald. 2011. Evaluation of fungicides on turfgrass quality of an annual bluegrass putting green in western Oregon, 2010. PDMR: Plant Dis. Manage. Rep. 5:p. T046. |
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| Web URL(s):
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Last checked: 11/14/2016
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Access conditions: Item is within a limited-access website |
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