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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H.;
Fidanza, M. A. |
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| Author Affiliation: | Dept. of Agronomy, Univ. of Maryland, College Park, MD |
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| Title: | Preventative brown patch control in bentgrass, 1991 |
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| Source: | Fungicide and Nematicide Tests. Vol. 47, 1992, p. 283. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Brown patch; Preventive control; Agrostis
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| Abstract/Contents: | "Fungicides were applied prior to visual blighting on wither a 14 day spray interval (15 and 29 May, and 12 Jun) or on a 28 day spray interval (15 May and 12 Jun). Fungicides were applied with a CO2 pressurized (36 psi) sprayer in 2.5 gal water per 1000 ft2. Creeping bentgrass was maintained under putting green conditions and mowed at a 5/32" height. Soil was loamy sand with a pH of 6.6 and 4.4% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted by R. solani was determined visually on a 0 to 100% scale where 0 = no injury, and 100 = entire plot area brown or dead. Blight ratings exceeding 2% would be considered unacceptable brown patch control for a putting green. Disease pressure was initially moderate, but become very severe by early Jun. Data recorded fourteen days after fungicides were applied (i.e. 29 May) showed that all treatments had provided effective, preventative brown patch control when disease pressure was light. Brown patch became severe in response to high night temperatures in most of Jun. On 5 Jun, all treatments except Systhane (7 days since last applied), and Curalan and vincozalin (20 days since last applied) were providing effective brown patch control. On 12 Jun it had been 28 days since Prostar + Bayleton and Sentinel (0.25 oz) were last applied, and these treatments continued to provide excellent brown patch control as well as treatments applied on the 14 day spray schedule. All plots were retreated on 12 Jun, but Curalan and vinclozalin-treated plots continued to exhibit an unacceptable level of R. solani blighting on 19 and 26 Jun, and 3 Jul. The residual brown patch control effectiveness of ASC 66825 (0.4 oz), Systhane, and Sentinel (0.17 oz) showed signs of breaking down on 26 Jun. Brown patch was extremely severe by 3 Jul (i.e. 21 days since all treatments were last applied). While all treatments reduced brown patch significantly, only ASC 66900, ASC 66825 (0.6 oz), ProStar + Bayleton and Sentinel (0.25 oz) had continued to provide a commercially acceptable level of brown patch control for putting greens." |
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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 M. A. Fidanza. 1992. Preventative brown patch control in bentgrass, 1991. Fungicide Nematicide Tests. 47:p. 283. |
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