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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Dernoeden, P. H.;
Fidanza, M. A.;
Zhang, M. |
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| Author Affiliation: | Department of Agronomy, University of Maryland, College Park , MD 20742 |
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| Title: | Brown patch control with Rhone Poulenc fungicides, 1993 |
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| Source: | Fungicide and Nematicide Tests. Vol. 49, 1994, p. 358. |
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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: Lolium perenne; Brown patch; Rhizoctonia solani; Disease control; Fungicide evaluation; Fungicides
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| Cultivar Names: | Caravelle |
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| Abstract/Contents: | "All treatments were applied on 14-day intervals on the dates footnoted in the data table. The materials were applied with 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 5.9 and 2.5% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replicates. Percent of plot area blighted or injured was visually assessed on a linear 0 to 100% scale where 0 = entire plot area green, and 100 = entire plot area blighted. Turf quality was visually determined on a 0 to 10 scale where 0 = entire area brown or dead; and 10 = optimum greenness and density. Brown patch ratings exceeding 2% would be considered unacceptable control for a golf course fairway. Brown patch pressure was in the low to moderate range during Jun, became very severe from mid-to-Jul, and was moderately severe during late Jul and early Aug. All treatments effectively controlled brown patch through early Jul when disease pressure was low (data not shown). Plots developed yellow or orange spots in early Jul, but R. solani could not be isolated from any fungicide-treated plots. Curvularia spp. was common, but a small number of leaves yielded R. zeae at this time. Data collected 2 Jul showed that greatest injury (i.e., not brown patch) was observed in plots treated with EXP 10064C, EXP 10307A (2.0 fl oz), and untreated turf. Turf quality was lowest in aforementioned treatments and highest in plots sprayed with Aliette + Fore and EXP 10307A + EXP 02164B (1.5 + 1.2 fl. oz). The unknown injury dissipated within a week, but remained relatively high where EXP 10307A (2.0 fl. oz) was applied. Typical R. solani blighting was very active on 12 Jul in non-fungicide-treated turf. Except for EXP 01945B (4.5 oz) and CL 3336, all treatments were providing acceptable brown patch control. Extremely severe blighting or copious amounts of foliar mycelium were evident on 17 Jul and nearly all plots were experiencing some blighting. Excellent control at this time was being provided by Chipco 26019, EXP 10452A, EXP 10307A + EXP 02164B, and Aliette + Fore. Between 17 and 26 Jul, brown patch was only slightly active, and the large amounts of mycelium observed 17 Jul caused little overall blighting. Data collected 26 Jul showed that all treatments greatly reduced damage, especially treatments with 0 to 1% blight ratings. Disease activity remained low and there was little change in blight ratings on 3 Aug. Several plots, however, displayed chemical injury that was quite similar to leaf spot damage. Leaves of plants, especially from plots treated with EXP 10452A (2.0 oz), EXP 10064C, and EXP 10307A (2.0 fl. oz), had leaf lesions similar to those caused by Bipolaris or Drechslera spp. and turf was thinning and had an orange-bronze color. This injury greatly reduced quality despite very low brown patch ratings on 3 Aug. Excellent turf quality was observed in plots treated with Chipco 26019, EXP 10452A (1.0 oz), EXP 10307A + Exp 02164B, and Aliette + Fore (4.0 + 8.0 oz)." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract, with table, only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., M. A. Fidanza, and M. Zhang. 1994. Brown patch control with Rhone Poulenc fungicides, 1993. Fungicide Nematicide Tests. 49:p. 358. |
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