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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PHYTO.2001.91.1.111
Last checked: 08/25/2010
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Pfender, W. F. |
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| Author Affiliation: | USDA - ARS National Forage Seed Production Research Center, Oregon State University, Department of Botany and Plant Pathology, Corvallis |
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| Title: | A temperature - based model for latent - period duration in stem rust of perennial ryegrass and tall fescue |
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| Section: | Epidemiology
Other records with the "Epidemiology" Section
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| Source: | Phytopathology. Vol. 91, No. 1, January 2001, p. 111-116. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 6 |
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| Keywords: | TIC Keywords: Temperatures; Models; Puccinia graminis subsp. graminis; Lolium perenne; Statistics; Festuca arundinacea; Infection; Infectivity; Latent heat; Relationships
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| Cultivar Names: | Morningstar; Shenandoah |
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| Abstract/Contents: | "A temperature-response curve for latent duration in stem rust (caused by Puccinia graminis subsp. graminicola) on perennial ryegrass and tall fescue was developed from constant-temperature experiments with inoculated plants and evaluated in field experiments. Under constant-temperature conditions, time from infection to 50% of pustules erupted for perennial ryegrass ranged from 54 days to 3.5°C to 5.9 days at 26.5°C. The latent period (LP₅₀) duration of tall fescue was 69 and 8.5 days at these respective temperatures. The dependence of latent-period completion rate on temperature was best described as a linear increase in rate with temperature up to approximately 26°C, then an exponential decline with temperature up to the maximum (lethal) temperature of approximately 35.5°C. LP₂₀, the time required for 20% of open pustules to appear, was used as an estimator of latent-period duration for field observations. Percentage of one latent period completed per half hour (half-hourly rate), for perennial ryegrass was modeled as (0.0156T - 0.0206)(1 - exp[0.497(T - 35.5)]}, where T= average temperature (°C) during the half - hour period. For tall fescue the modeled rate was (0.0109T - 0.00214) {1 - exp[0.417(T - 35.5)]}. Latent periods modeled by these equations were compared with observed latent periods in field experiments with potted plants, where half - hourly temperatures were measured. Linear regressions of modeled virus observed latent periods had adjusted rD]2 values of 0.96 for perennial ryegrass and 0.93 for tall fescue. The latent-period equations could be used as components of a weather-based disease advisory model to optimize fungicide use in stem-rust management on these crops" |
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| Language: | English |
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| References: | 16 |
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| Note: | Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Pfender, W. F. 2001. A temperature - based model for latent - period duration in stem rust of perennial ryegrass and tall fescue. Phytopathology. 91(1):p. 111-116. |
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| Web URL(s):
http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PHYTO.2001.91.1.111
Last checked: 08/25/2010
Requires: PDF Reader |
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MSU catalog number: SB 599 .P48 |
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