Full TGIF Record # 34137
Item 1 of 1
Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Dernoeden, P. H.; Fidanza, M. A.; Wetzel, H. C.
Author Affiliation:Department of Agronomy, University of Maryland, College Park, MD 20742
Title:Curative brown patch control with Pro Star and Chipco 26019, 1993
Source:Fungicide and Nematicide Tests. Vol. 49, 1994, p. 324.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Brown patch; Agrostis tenuis; Rhizoctonia solani; Disease control; Fungicide evaluation; Fungicides
Cultivar Names:Bardot
Abstract/Contents:"Brown patch damage ranged from 9 to 14% plot area blighted across the test site when treatments were initiated on 5 Jul. A second fungicide application was made on 19 Jul. Materials were applied with a CO2 pressurized (35 psi) sprayer calibrated to deliver 2.5 gal water per 1000 ft2. Soil was a Chillum silt loam with a pH of 6.1 and 3.5% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replicates. Percent of plot area blighted was visually assessed on a 0 to 100% linear scale where 0 = entire plot area green and 100 = entire plot area blighted. Disease pressure was moderate to severe during most of Jul, but during late Jul and early Aug disease pressure subsided to a low level. Percent of plot area blighted remained unchanged in treated plots between 5 and 12 Jul, while blighting increased in non-fungicide-treated plots. On 19 Jul, disease severity was peaking and blight ratings had increased slightly in ProStar-treated plots; whereas, blight levels had decreased slightly in Chipco 26019-treated plots. Plots were retreated on 19 Jul, and weather conditions shifted to low night relative humidity and brown patch severity dropped dramatically despite high temperature stress. One wk later (i.e. 26 Jul), all fungicide-treated plots showed amazing recovery and by 2 Aug there was no R. solani damage evident in fungicide-treated turf. Hence, fungicides limited R. solani activity following the 5 Jul treatment, but a shift in weather was required before turf could completely recover. R. solani is primarily a foliar blighting pathogen and turf recovery is primarily achieved by replacing damaged foilage with new leaves. Data collected on 19 Jul, however, suggested that the curative activity of ProStar had diminished by 14 days after the initial treatment, and that a second application was needed to assist in the recovery process."
Language:English
References:0
Note:This item is an abstract, with table, only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., M. A. Fidanza, and H. C. Wetzel. 1994. Curative brown patch control with Pro Star and Chipco 26019, 1993. Fungicide Nematicide Tests. 49:p. 324.
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