Full TGIF Record # 107281
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Web URL(s):https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az13593d5.pdf
    Last checked: 02/06/2017
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Author(s):Kopec, D.; Olsen, M.; Gilbert, J.; Bigelow, D.; Kohout, Michele; Twito, M.
Author Affiliation:Kopec: Department of Plant Sciences; Olsen: Division of Plant Pathology and Microbiology; Plant Sciences; Gilbert: Senior Research Specialist; Bigelow: Research Specialist, Plant Pathology and Microbiology; Plant Sciences; Kohout: Undergraduate Student, Department of Microbiology, University of Arizona, Tucson, Arizona; Twito: Superintendent, Estrella Mountain Ranch Golf Course and Country Club
Title:Response of cool season turfs when overseeded on a putting green with a history of rapid blight disease
Section:Disease, disease control and pests
Other records with the "Disease, disease control and pests" Section
Source:2004 Turfgrass, Landscape and Urban IPM Research Summary [Arizona]. 2004, p. [1-10].
# of Pages:10
Publishing Information:Tucson, AZ: University of Arizona College of Agriculture & Life Sciences
Keywords:TIC Keywords: Responses; Cool season turfgrasses; Overseeding; Golf greens; Rapid blight; Disease profile; Cynodon dactylon; Cynodon transvaalensis; Disease susceptibility; Cynodon; Infection; Cultivar susceptibility; Labyrinthula terrestris; Visual evaluation
Cultivar Names:Tifgreen
Abstract/Contents:"Rapid blight disease is a potentially devastating disease on cool season overseed turfs when irrigated with saline water. A two year test was conducted on a closely mowed Tifgreen bermudagrass turf which was infected with visual symptoms of necrotic patches of turf, and various degrees of blighting. The test included a broad representation of turf species for overseeding in an effort to (1) determine selected [species]/cultivar susceptibility and disease expression to rapid blight in the field and (2) survey and assess the association of laboratory isolate detection from field sampling, with disease occurrence and severity of expression of field maintained overseed turf. Over a two year period, Rapid blight, caused by Labyrinthula terrestris was capable of infesting most cool season grasses in this test. In year one, Dawson CRF, SRX 555 slender creeping red fescue, and SR 105210 slender creeping red fescue showed no positive lab detection results from field plots. In year two (2003-2004), only SRX 555 SLQ had only 1 plot known to carry Labyrinthula throughout the main infestation season. In year two, essentially all turf plots showed some symptomology of disease expression. This was confirmed by lab identification. Tiller infection rates varied from 2% to 80% infection in the lab from field samples. The relationship between tiller infection rates and field plot disease expression was determined by Pearson's product and Spearman Rank correlation coefficients. Field plot disease scores were correlated with percent tiller infection rates, R2 = -0.56 plot basis, and R2 = -0.71 treatment mean basis, respectively. Spearman Rank correlation coefficients were R2 =; -0.62 on a plot basis, and R2 =-0.78 based on treatment means Agreement between the disease condition (yes/no) vs. lab findings (positive/negative) occurred on 51 of 59 plot cases, and was significant compared to chance alone occurrences. Over two years, entries which had low disease scores included Fult's alkali grass, Dawson creeping red fescue, SRX 555 SLQ slender creeping red fescue, SR 5210 slender creeping red fescue, and Providence creeping bentgrass. Over two years, entries which produced high field disease rating scores included SR 3100 Hard fescue, TransEze intermediate ryegrass, SR 4400 perennial ryegrass, SR 7200 velvet bentgrass, SR 7100 colonial bentgrass, Sabre and Laser Poa trivialis, and Redtop."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kopec, D., M. Olsen, J. Gilbert, D. Bigelow, M. Kohout, and M. Twito. 2004. Response of cool season turfs when overseeded on a putting green with a history of rapid blight disease. Turfgrass Landscape Urban IPM Res. Summ. p. [1-10].
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    Last checked: 02/06/2017
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