Full TGIF Record # 55460
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Publication Type:
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Report
Author(s):Dernoeden, P. H.; Krouse, J. M.
Author Affiliation:Department of Natural Resource Science & LA, University of Maryland, College Park, MD
Title:Brown patch and red leaf spot control with aliette and prostar; 1997
Source:Fungicide and Nematicide Tests. Vol. 53, 1998, p. 430.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Agrostis tenuis; Rhizoctonia solani; Sclerotinia homoeocarpa; Pyrenophora erythrospila; Disease control; Fungicides; Flutolanil; Experimental products; Tank mix; Chlorothalonil; Triadimefon; Formulations; Application rates; Fosetyl Al
Abstract/Contents:"Brown patch and red leaf spot control with aliette and prostar; 1997. Fungicides were applied with a CO₂ pressurized (34 psi) sprayer equipped with a flat-fan (8010) nozzle, and calibrated to deliver 2.5 gal water per 1000 ft². Treatments were applied on 14,21, or 28-day intervals on the dates footnoted in the data table. Soil was a Chillum silt loam with a pH of 6.0 and 2.5% OM. Turf was maintained at 0.60 inches, and was fertilized with 2.0 lb N/1000ft²/yr in the fall. Plots were 5 ft x 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was assessed visually on a linear 0 to 100% scale where 0= entire plot area green and healthy, and 100= entire plot area blighted. Overall turfgrass quality was assessed visually using a 0 to 10 scale, where 0= turf brown or dead, 8.5= minimum acceptable quality for fairways and 10= optimum greenness and density. Brown pathc ratings exceeding 2% blight would be considered unacceptable for golf course fairwayss and tees. Brown patch and red leaf spot pressure was moderately severe. An extended period of heat, drought and abnormally low relative humidity after 14 Jul greatly reduced blighting by R. solani. Dollar spot pressure was very low. Only red leaf spot was active in the test site when fungicide applications were initiated. Chipco Aliette Signature and Chipco Aliette did not control brown patch. On 28 Jul, there was more brown patch in plots receiving only Aliette compared to all other treatments. All other treatments provided acceptable brown patch control through the severe disease pressure period between 7 and 14 Jul. By 21 Jul, ProStar 3.0 oz (last applied 30 Jun) was no longer providing acceptable brown patch control. Aliette Signature+EXP 10791A Aliette Signature+EXP10702B lost their residual effectiveness 21 days after the last application (i.e., 28 Jul). Dollar spot pressure was light, but data showed that Aliette and ProStar applied alone gave no dollar spot control. Red leaf spot was active before fungicides were applied on 9 Jul. ProStar applied alone enhanced red leaf spot. Chipco 26019 did not reduce the disease and plots had unacceptable quality. All plots treated with Aliette had ≤1% of plot area injured by red leaf spot. At the height of desease pressure from both brown patch and red leaf spot, only plots receiving Aliette in a tank mix combination had acceptable quality, which was in the excellent (i.e., ≥ 9.5) range."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. M. Krouse. 1998. Brown patch and red leaf spot control with aliette and prostar; 1997. Fungicide Nematicide Tests. 53:p. 430.
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