Full TGIF Record # 100734
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Web URL(s):http://turf.rutgers.edu/research/abstracts/symposium2005.pdf#page=37
    Last checked: 11/26/2007
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Bonos, Stacy A.; Watkins, Eric; Meyer, William A.
Author Affiliation:Department of Plant Biology and Pathology, Rutgers University
Title:The evaluation of brown patch resistance in tall fescue
Section:Poster presentations
Other records with the "Poster presentations" Section
Meeting Info.:Cook College, Rutgers, NJ: January 13-14, 2005
Source:Proceedings of the Fourteenth Annual Rutgers Turfgrass Symposium. 2005, p. 36.
Publishing Information:New Brunswick, NJ: Center for Turfgrass Science, Cook College, Rutgers, The State University of New Jersey
# of Pages:1
Keywords:TIC Keywords: Disease resistance; Rhizoctonia blight; Disease development; Festuca arundinacea; Rhizoctonia solani; Disease susceptibility
Abstract/Contents:"Brown patch caused by the fungus Rhizoctonia solani (Kühns), is one of the most importnant diseases affecting tall fescue (Festuca arundinacea Schreb) turfs. The identification and utilization of tall fescue cultivars with improved resistance to brown patch would improve quality and reduce the need for fungicide applications. Variation in brown patch resistance exists among tall fescue cultivars. However, there are no published reports on the inheritance of resistance in tall fescue. The heritability of brown patch resistance in tall fescue will be important for tall fescue breeding programs to determine selection efficiency and to understand the inheritance of disease resistance in tall fescue. The objectives of ths study were to: 1) determine broad- sense heritability estimates for brown patch resistance in tall fescue populations, and 2) evaluate cultivars and experimental selections of tall fescue for resistance to brown patch disease. Several tall fescue field experiments consisting of commercial cultivars and experimental selections were evaluated for brown patch disease resistance. Experiment 1 compared brown patch disease resistance of 33 cultivars and selections planted in three replicated tall fescue field trials established in 1998 at Adelphia, North Brunswick and Pittstown, NJ. Experiment 2 compared brown patch disease resistance of 160 and 41 cultivars and selections planted in two replicated tall fescue field trials established in 2001 and North Brunswick and Adelphia, NJ and one replicated trial established in 2002 at Adelphia, NJ, respectively. Field plots were ioculated with Rhizoctonia solani mycelium grown on sterilized Kentucky bluegrass (Poa pratensis L.) seed at a rate of 0.25 g m-2. Susceptibility of germplasm to brown patch was evaluated following disease development, which occured two to three weeks after inoculation. Broad sense heritability estimates were determined from restricted maximun likelihood (REML) variance and covariance components using the random model of Proc MIXED (SAS Institute, Cary, NC). Most cultivars and selections evaluated in both experiments had moderate to high levels of brown patch disease. Moderate broad-sense heritability estimates for brown patch disease resistance in tall fescue were obtained (0.74 to 0.55) depending on the experiment and number of cultivars replicated in each experiment. These heritability estimates are lower than those reported for dollar spot (caused by Sclerotinia homoeocara F.T. Bennet) resistance in creeping bentgrass (Agrostis stolonifera L.) (H=0.90) (Bonos et al., 2003) and gray leaf spot (caused by Pyricularia grisea (Cooke) Sacc) resistance in perennial ryegrass (Lolium perenne L.) (H=0.92) (Bonos et al., 2004). These data indicate that brown patch disease development may be more affected by the environment than dollar spot or gray leaf spot diseases. These heritability estimates indicate that selection for resistance should be possible in the next generation, which will be important for the development of more disease resistant cultivars."
Language:English
References:2
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bonos, S. A., E. Watkins, and W. A. Meyer. 2005. The evaluation of brown patch resistance in tall fescue. Proc. Annu. Rutgers Turfgrass Symp. p. 36.
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http://turf.rutgers.edu/research/abstracts/symposium2005.pdf#page=37
    Last checked: 11/26/2007
    Requires: PDF Reader
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MSU catalog number: SB 433 .R88
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