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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, College Park, MD |
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| Title: | Fungicides for control of leaf spot-red thread complex, 1991 |
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| Source: | Fungicide and Nematicide Tests. Vol. 47, 1992, p. 297. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Poa pratensis; Leaf spot; Drechslera poae; Red thread; Laetisaria fuciformis; Fungicides; Disease control
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| Abstract/Contents: | "Fungicides were applied initially on 4 Apr and symptoms of both disease were evident. Except for Sentinel alone, all treatment were reapplied on 1 May. Fungicides were applied with a CO2 pressurized (36 psi) sprayer in 2.5 gal water per 1000 ft2. There was 0.1 inch of rainfall within 24 hrs after the first application. Soil was a Chillum silt loam with a pH of 6.4 and 2.6% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area injured was assessed visually on a 0 to 100% scale where 0 = entire plot area green; and 100 = entire plot area blighted or dead. Treatments with ratings exceeding 5% of plot area injured would be considered unacceptable control on a golf course fairway. Overall quality was determined visually on a 0 to 10 scale where 0 = brown or dead turf, and 10 = optimum greenness and density. Composite disease level was severe. Initially (22 Apr) and later (14 May) damage was assessed as a composite rating of both leaf spot and red thread damage. During overcast periods the diseases could be more easily distinguished from one another. The 22 Apr composite rating showed that all treatments, except Sentinel alone and Fore, had providede commercially acceptably control. Data collected 29 Apr and 9 May revealed that Sentinel and Fore effectively controlled read threat [thread], but had no effect on controlling leaf spot. Conversely, Dyrene effectively controlled leaf spot, but not red thread. Chipco 26019, Curalan, Vinclozalin, Sentinel + Rizolex and MON 24004 provided acceptable control of both diseases from 22 Apr to 14 May. ProStar significantly reduced leaf spot and was very effective in controlling red thread. Best overall quality, and therefore best overall disease control, was observed on 14 May in plots treated with Chipco 26019, Curalan, Vinclozalin, Sentinel + Rizolex, Dyrene, MON 24004 and ProStar. On 10 Jun, lowest quality was observed in untreated plots and plots treated with Sentinel alone." |
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| Language: | English |
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| References: | 0 |
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| Note: | Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. M. Krouse. 1992. Fungicides for control of leaf spot-red thread complex, 1991. Fungicide Nematicide Tests. 47:p. 297. |
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