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| Publication Type:
| Report |
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| Author(s): | Deroeden, P. H.;
Krouse, J. M. |
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| Author Affiliation: | Department of Natural Res. Sci. & LA, University of Maryland, College Park, MD |
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| Title: | Brown patch and red leaf spot control with DMI fungicides; 1997 |
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| Source: | Fungicide and Nematicide Tests. Vol. 53, 1998, p. 431. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis tenuis; Rhizoctonia solani; Pyrenophora erythrospila; Fungicides; Disease control; Cyproconazole; Azoxystrobin; Triadimefon; Penconazole; Myclobutanil; Mancozeb; Chlorothalonil; Tank mix; Application frequency
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| Abstract/Contents: | "Brown patch and red leaf spot control with DMI fungicides; 1997. Fungicides were applied with a CO₂ pressurized (34 psi) sprayer equipped with a flat-fan (8010) nozzle, and alibrated to deliver 2.5 gal water per 1000 ft². Lynx IG was applied with a shaker jar. Treatments were applied once or on 14 or 21-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/1000 ft²/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. Ratings exceeding 2% blight would be considered unacceptable for golf course fairways and tees. Disease pressure was moderately severe in mid-Jul, but drought and very low relative humidity in later Jul greatly reduced brown patch pressure. Only red leaf spot was active when treatments were initiated. All treatments provided acceptable brown patch control through the highest disease pressure period of 7 to 14 Jul. Lynx 1G applied on the 14-day interval and Fore-treated plots had unacceptable brown patch levels on the final two rating dates. Red leaf spot was active when treatments were initiated on 9 Jun. The disease only remained active in untreated turf and plots receiving Lynx 1G. Plots treated with Lynx 1G on the 21-day interval had more red leaf spot injury than non-fungicide-treated turf. Turf quality on 14 Jul was unacceptable in Lynx 1G-treated plots due to red leaf spot; whereas, Eagle-treated turf was discolored by the fungicide. All other fungicide-treated plots had good (≥8.5) or excellent (i.e., ≥ 9.5) quality. Sentinel and Heritage, applied only once on 9 Jun, gave excellent brown patch control throughout the study, but disease pressure was low after the 14 Jul rating." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Deroeden, P. H., and J. M. Krouse. 1998. Brown patch and red leaf spot control with DMI fungicides; 1997. Fungicide Nematicide Tests. 53:p. 431. |
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