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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Giesler, L. J.;
Yuen, G. Y.;
Watkins, J. E.;
Horst, G.;
Wit, L. |
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| Author Affiliation: | Departments of Plant Pathology and Horticulture, University of Nebraska |
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| Title: | Response of tall fescue cultivars to brown patch, 1991-92 |
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| Source: | Biological and Cultural Tests for Control of Plant. Vol. 8, 1993, p. . |
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| Publishing Information: | St. Paul, MN: The American Phytopathological Society |
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| # of Pages: | 122 |
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| Keywords: | TIC Keywords: Festuca arundinacea; Brown patch; Rhizoctonia solani
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| Abstract/Contents: | "Nine cultivars, with canopy types of dwarf, medium, and tall, were evaluated for response to brown patch caused by Rhizoctonia solani. The experiments were performed at the University of Nebraska John Seaton Anderson Turfgrass Facility, Mead, NE on turf planted in 1990. The turf was fertilized monthly from May through Sep with 0.6 lb actual N per 1000 sq ft during both years. Throughout each experiment, the plots were irrigated nightly with approximately 1.5 in of water per week to maintain high leaf moisture. On 6 Jun 1991, R. solani grown on sterilized oat seed was used as inoculum on all plots at a rate of 8 lb per 1000 sq ft. In 1992 inoculations were made on 11 Jun at 8 lb per 1000 sq ft and repeated on 10 Aug. In 1991, the effect of cutting height on brown patch also was evaluated. The experiment was a split block design with two cutting heights (1.5 and 3 in) being the primary treatments and cultivar being the subplot treatment. In 1992, cutting heights were not varied and the entire experiment was maintained at 2.5 in. In both years there were four 5 ft by 5 ft replicate plots per treatment. The plots were rated for brown patch severity every 2 wks through Sep using one of two methods. In 1991, the percentage of turf exhibiting blight was visually assessed. In 1992, because less than 20% blight occurred, disease severity was measured instead by rating brown patch lesion development within the canopy on a 0 to 10 scale (0 = no lesions, 10 = most severe) within 1 sq ft areas; three measurements were made per plot and averaged prior to statistical analysis. The disease did not develop to expected levels either year due to abnormally low temperatures. In 1991, there was a significant difference in blight severity between cutting heights with seasonal averages of 52 and 44 percent blight at the low and high cutting heights, respectively. However, blight due to brown patch was difficult to distinguish from canopy death due to other stress factors at the low cutting height. Therefore, the 1992 experiment was conducted at one height. In 1992, disease ratings were lowest on the first reading (9 Jul), with a mean rating of 3.3 over all cultivars. Overall mean ratings on six subsequent dates ranged from 4.9 to 6.1. In both years, KY31 had the lowest level of disease development. There were no significant differences between medium and dwarf cultivars." |
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| Language: | English |
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| References: | 0 |
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| Note: | Table
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Giesler, L. J., G. Y. Yuen, J. E. Watkins, G. Horst, and L. Wit. 1993. Response of tall fescue cultivars to brown patch, 1991-92. Biol. Cult. Tests Control Plant Dis. 8 |
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MSU catalog number: SB 975 .B5 |
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