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| Publication Type:
| Report |
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| Author(s): | Barber, J. F.;
Kenna, M. P.;
Conway, K. E. |
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| Author Affiliation: | Departments of Horticulture and Plant Pathology, Oklahoma State University, Stillwater |
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| Title: | Evaluation of fungicides for preventative control of brown patch on bentgrass in Oklahoma |
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| Source: | Fungicide and Nematicide Tests. Vol. 45, 1990, p. 266. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Brown patch; Rhizoctonia cerealis; Propiconazole; Chlorothalonil; Vinclozolin; Fungicide evaluation
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| Abstract/Contents: | "The site for the evaluation was a 'Pennlinks' creeping bentgrass golf green (90-10% sand-organic matter, pH 7.4) located at Stillwater, OK. The green was maintained at 0.16 in. mowing height, with 1.0 lb N/1000 ft2 applied monthly. Irrigation was supplied to prevent visual moisture stress. Experimental units were 3 x 12 ft plots consisting of a 2 x 12 ft treatment area and a 1 x 12 ft paired untreated check. A randomized complete block design with 3 replications was used. Each plot was subdivided into 3 sections and a different section was used for 7 and 14 days after treatment (DAT). Twenty-four treatments were applied on 6 Jun 89 and repeated 23 Jun 89 with a CO2 sprayer at 40 psi. Between application dates, a natural infestation of Rhizoctonia cerealis occurred over the entire experimental area. The infestation was used to evaluate treatments on 30 Jun 89 (7DAT) and 7 Jul 89 (14 DAT). Disease severity was evaluated by rating the plot and untreated check for disease on a 1 to 9 scale (i.e., 1 = no disease and 9 = completely blighted). Disease control was calculated (i.e., [(check - treated)/check] x 100) to adjust for variability of brown patch infestation across the experimental area. Eight of the 24 fungicide treatments were duplicate treatments on creeping bentgrass fertilized with Ringers 10-4-4 Turf Restore. Scotts ProTurf HD 22-0-16 Greens fertilizer was used on the other 16 treatments. Phytotoxicity was rated on a 1 to 9 scale (i.e., 1 = no damage and 9 = plant death) for all treatments on 7DAT and 14DAT. Several fungicide treatments had excellent control of brown patch. Daconil DG90, Daconil 2787 WP75, San-619F WG40, and Vorlan DF50/Fungo WP50 had disease control higher than 90%. Several products had good preventative control at 14DAT. The Turf Restore did not have any activity by itself or in combination with poor products. There was a trend for Turf Restore in combination with good products to have higher disease control. Phytotoxicity was noted on San-619F WG40 and San-832F WP50. This seemed to increase when the products were used in combination with Turf Restore. The Banner EC 1.1 + Turf Restore had slight phytotoxicity." |
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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):
Barber, J. F., M. P. Kenna, and K. E. Conway. 1990. Evaluation of fungicides for preventative control of brown patch on bentgrass in Oklahoma. Fungicide Nematicide Tests. 45:p. 266. |
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