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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H.;
Krouse, J. M. |
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| Author Affiliation: | Dept. of Agronomy, Univ. of Maryland |
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| Title: | Preventative brown patch control with fungicides, 1989 |
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| Source: | Fungicide and Nematicide Tests. Vol. 45, 1990, p. 282. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Lolium perenne; Brown patch; Penconazole; Triadimefon; Chlorothalonil
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| Abstract/Contents: | "Initial fungicide treatments were applied prior to the appearance of symptoms to a one year old stand of perennial ryegrass. Treatments were applied on two spray intervals, and on the dates shown in the data table. Fungicides were applied with a CO2 pressurized (38 psi) sprayer in 2.5 gal. water per 1000 ft2. Rain (0.26 in.) fell within 8 hrs of the initial (14 June) application, but no rain occurred within 24 hrs of all other spray dates. Soil was a Chillum silt loam with a pH of 6.4 and 2.6% O.M. Percent of plot area blighted was visually determined on a 0 to 100% scale. Overall quality was assesssed on a 0 to 10 scale where 0 = brown or dead turf, and 10 = optimum greenness and density. Treatments with ratings exceeding 5% plot area blighted would be considered unacceptable control for golf course fairway turf. Disease pressure was severe in late June, but light to moderate during July and August. All treatments had significantly reduced brown patch severity on all rating dates. Except for Lynx 2F (0.5 fl. oz. on a 14-day interval and 1.0 fl. oz. on a 28 day interval) and SDS 66811 (0.6 fl. oz.), the fungicides generally provided commercially acceptable control when plots were rated on 28 June and 11 July. Brown patch was only slightly active during most of July, and differences in treatments did not become evident again until 10 August. Data recorded 18 and 20 August indicated that, in general, very good residual brown patch control was provided by Lynx 2F (1.0 fl. oz. on a 14-day interval), Lynx 25 DF (0.5 and 1.0 oz. on a 14-day interval), Bayleton, Chipco 26019, and SDS 66811 (1.1 and 2.3 fl. oz.). The best combination of brown patch control and overall quality on 29 August was provided by Bayleton (4.0 oz. on a 28-day interval) and Lynx 25 DF and 2F (1.0 oz. on 14-day interval)." |
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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):
Dernoeden, P. H., and J. M. Krouse. 1990. Preventative brown patch control with fungicides, 1989. Fungicide Nematicide Tests. 45:p. 282. |
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MSU catalog number: SB 951.3 .F82 |
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