Full TGIF Record # 21501
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Dernoeden, P. H.; Krouse, J. M.
Author Affiliation:Dept. of Agronomy, Univ. of Maryland, College Park, MD
Title:Preventative brown patch control with Lynx, 1990
Source:Fungicide and Nematicide Tests. Vol. 46, 1991, p. 324.
Publishing Information:St. Paul, MN: American Phytopathological Society
Keywords:TIC Keywords: Rhizoctonia solani; Fungicide evaluation; Lolium perenne; Brown patch; Diseases; Disease control; Fungicides; Mancozeb; Penconazole
Abstract/Contents:"Fungicide applications were initiated 20 Jun prior to the appearance of R. solani activity. Treatments were applied on either a 14 or 28 day interval on the dates footnoted in the data table. Fungicides were applied with a CO2 pressurized (36 psi) sprayer in 2.5 ga water per 1000 ft2. Soil was a Chillum silt loam with a pH of 7.1 and 1.3% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was determined visually on a 0 to 100% scale. Ratings that exceed 5% plot area blighted would be considered an unacceptable level of brown patch control on a golf course fairway. Overall quality was assessed visually on a 0 to 10 scale where 0 = brown or dead turf and 10 = optimum greenness and density. Disease pressure was light to moderate in Jul. Mowing height was reduced from 2.5" to 1.5" on 6 Aug, which exposed lower canopy injury from R. solani resulting in higher injury ratings on 10 Aug. Between 10 and 18 Aug weather conditions became overcast and wet, and temperature did not drop below 68F. At this time, brown patch pressure became very severe. Except for Lynx 2F at 0.5 fl oz., all treatments provided commercially acceptable brown patch control during Jul. On 3 Aug, however, only Lynx 1.2EC (0.83 fl.oz.) and Chipco 26019 had reduced foliar blighting significantly and were providing acceptable control. Fungicides were last applied 3 Aug and 20 Jul on the 14 and 28 day spray interval, respectively. Lynx 1.2EC (0.83 fl.oz. applied on the 14-day interval) provided the best combination of disease control and overall turfgrass quality during Aug. Uuse of Penetrator 3 as an adjuvant did not improved [improve] Lynx efficacy. Extremely poor turf quality was observed 24 Aug in plots treated with Manzate; ProStar; Lynx 1.2EC (0.83 and 1.67 fl.oz. applied on a 28 day interval); and Lynx 2F and 25DF + Penetrator."
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., and J. M. Krouse. 1991. Preventative brown patch control with Lynx, 1990. Fungicide Nematicide Tests. 46:p. 324.
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