Full TGIF Record # 124045
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Web URL(s):https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T049.pdf
    Last checked: 11/14/2016
    Requires: PDF Reader
Publication Type:
i
Report
Author(s):Kaminski, J. E.
Author Affiliation:Department of Plant Science, University of Connecticut, Storrs, Connecticut
Title:Preventive control of brown patch in colonial bentgrass, 2005
Section:Turfgrass
Other records with the "Turfgrass" Section
Source:F&N Tests. Vol. 61, 2006, p. T049.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Agrostis tenuis; Brown patch; Preventive control; Fungicide evaluation; Application rates; Application timing
Abstract/Contents:"Fungicides were evaluated for their effect on brown patch control on colonial bentgrass when applied on a preventive basis. This study was conducted at the University of Connecticut Plant Science Research and Teaching Facility located in Storrs, CT. Mowing was performed 4 times weekly at a height of 0.5 in. Sprayable fungicides were applied with a CO2 pressurized (34 psi) sprayer equipped with a flat-fan nozzle, and calibrated to deliver 2.5 gal water per 1000 ft2. All granular fungicides were applied by hand using a shaker bottle. Treatments were applied on the dates footnoted in the data table. Soil was a silt loam with a pH of 6.5. Turf was maintained at 0.50 in., and was fertilized with 2.5 lb N per 1000 sq ft between April and July 2005. Plots measured 5 ft x 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted by R. solani was assessed visually on a linear 0 to 100% scale where 0 = entire plot area green and healthy, and 100 = entire plot area blighted. Treatments with ratings exceeding 5.0% plot area blighted by R. solani subjectively were considered to be unacceptable or at the threshold for re-treatment of a golf course fairway. Disease pressure became severe between mid-Jul and mid-Aug. Trace levels of brown patch were present when treatments were initiated on 22 Jun. Disease pressure was low to moderate in late Jun and by 29 Jun brown patch levels within untreated control plots had reached unacceptable levels (≥ 5%). By 7 Jul, disease pressure had become moderately severe and between 8.5 and 17% brown patch was observed in plots receiving CL-EXP-4, CL-EXP-4 + Spotrete, L- 0499, L-0500, and the soil surfactant Revolution. Although not statistically different from those treatments providing excellent brown patch control, unacceptable levels of brown patch were observed in plots receiving L-0498 (6.5%) and Insignia + Revolution (5.3%) on 7 Jul. Between 21 Jul and 18 Aug, disease pressure became severe and percent area affected by brown patch in the untreated plots ranged from 22 to 69%. Acceptable control (≤ 5.0 %) generally was observed in plots treated with Armada (0.6 and 1.2 oz on 28-d interval), Iprodione Pro (4 fl oz on 21-d interval), and Insignia or Heritage tank-mixed with Revolution (28-d interval). During the peak period of disease activity (21 Jul to 18 Aug), exceptional control (<2.0%) was provided on most rating dates from Heritage WG and TL (all rates and timings), Insignia, and L-0498. Throughout the study, plots receiving Banner MAXX, CL-EXP-4, CL-EXP-4 + Spotrete, Spectator, L- 0500, and Revolution generally provided moderate to poor suppression of brown patch when compared to the untreated control. Of the granular fungicides tested, L-0498 provided the highest level of brown patch control and was considered acceptable on 7 of 8 rating dates (all data not shown). Moderate and poor levels of disease suppression were observed from L-0499 and L-0500, respectively. Although considered unacceptable, Revolution applied alone suppressed brown patch on most rating dates when compared to the untreated control. When tank-mixed with Insignia or Heritage, Revolution provided acceptable or near-acceptable control throughout the study."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kaminski, J. E. 2006. Preventive control of brown patch in colonial bentgrass, 2005. F&N Tests. 61:p. T049.
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https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T049.pdf
    Last checked: 11/14/2016
    Requires: PDF Reader
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