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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.;
Wetzel, H. C. |
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| Author Affiliation: | Department of Agronomy, University of Maryland, College Park, MD 20742 |
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| Title: | Preventative brown patch control with Prostar and MON 24001, 1993 |
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| Source: | Fungicide and Nematicide Tests. Vol. 49, 1994, p. 325. |
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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; Brown patch; Disease control; Rhizoctonia solani; Fungicide evaluation; Fungicides
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| Cultivar Names: | Bardot |
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| Abstract/Contents: | "Low levels of brown patch appeared at the site in late May, and all treatments were initially applied 28 May 1993. Fungicides were applied on either a 14 or 21 day interval on the dates footnoted in the data table. Materials were applied with a 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 6.1 and 3.5% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with 4 replicates. Percent of plot area blighted was assessed visually on a 0 to 100% linear scale were 0 = entire plot area green and 100 = entire plot area blighted. Turf color was determined visually on a 0 to 10 scale where 0 = entire plot area brown or dead and 10 = optimum greenness. Treatments with disease ratings exceeding 2% would be condsidered to have provided unacceptable brown patch control on a golf course tee or fairway. Brown patch activity was in the low to moderate range from 28 May to 12 Jul, disease pressure was severe from 19 Jul to 3 Aug, and disease intensity then dropped rapidly to a low level during the remainder of the test period. On the first three rating dates brown patch pressure was in the low to moderate range and only now non-treated plots were being blighted. Thunderstorms and high night humidity intensified disease activity in mid-Jul. On 19 Jul, all fungicides were providing excellent brown patch control. Consan appeared to be controlling brown patch when disease pressure was low, however, when the weather pattern shifted to more greatly favor brown patch, Consan-treated plots were rapidly blighted within 10 days of application. Consan injured the colonial bentgrass, giving turf a brownish appearance for 7 to 10 days or longer after each application. Because all fungicides were providing excellent brown patch control, subsequent applications were suspended to determine residual effectiveness. SN 84363 and Chipco 26019 were the first to show loss of residual effectiveness on 2 Aug (i.e., 23 days since last applied). It should be noted, however, that disease pressure was quite low during late Jul and throughout early Aug, extending residual effectiveness of most materials. ProStar lost its residual effectiveness by 9 Aug (i.ei, 30 days since last applied); however, MON 24001 and Lynx continued to provide commercially acceptable control on the final rating date." |
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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 H. C. Wetzel. 1994. Preventative brown patch control with Prostar and MON 24001, 1993. Fungicide Nematicide Tests. 49:p. 325. |
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