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| DOI: | 10.1094/PD-90-1225 |
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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PD-90-1225
Last checked: 01/07/2008
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: | United States Department of Agriculture - Agricultural Research Service, National Forage Seed Production Reserch Center, Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon |
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| Title: | Interaction of fungicide physical modes of action and plant phenology in control of stem rust of perennial ryegrass grown for seed |
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| Section: | Research
Other records with the "Research" Section
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| Source: | Plant Disease. Vol. 90, No. 9, September 2006, p. 1225-1232. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 8 |
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| Keywords: | TIC Keywords: Lolium perenne; Puccinia graminis subsp. graminis; Azoxystrobin; Fungicide application; Application timing; Disease control; Germinability; Propiconazole; Rusts
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| Abstract/Contents: | "Azoxystrobin provided protective and curative effects against stem rust (caused by Puccinia graminis subsp. graminicola) of inoculated perennial ryegrass under field conditions, significantly reducing disease severity compared with the nontreated check when applied as much as 15 days before infection or 14 days after infection. Propiconazole had a signifcant effect when applied 13, but not 15, days before infection or 7, but not 9, days after infection. Either fungicide was well described by a second- or third-order polynomial with time (days or stem rust latent periods) as the independent cariable. When symptomatic plants were sprayed with a fungicide, subsequently urediniospore production per pustule was reduced by 73% in propiconazole-treated plants and by 95% in azoxystrobin-treated plants. Azoxystrobin modestly but significantly reduced germinability of urediniospores from sprayed pustules, unlike propconazole. These differences between the two fungicides in physical modes of action resulted in a marked difference in their effects on secondary, within-plant spread of the disease. In normal disease development, sporulation from the inner (adaxial) face of pustules on the flag-leaf sheath produces inoculum that leads to numerous contiguous secondary infections along the length of the emerging inflorescence, but only 7% of azoxystrobin-treated sheath pustules had sporulation from the adazial surface compared with 72 and 90% of propiconazole-treated and nontreated pustules, respectively. Tillers treated with propiconazole early in the process of within-plant spread had significantly greater final stem rust severity than thoes treated with azoxystrobin at this time. Results of these experiments will allow effects of fungicide application to be incorporated into quantitative epidemic models that describe disease development as a function of environment and plant phenology." |
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| Language: | English |
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| References: | 19 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Pfender, W. F. 2006. Interaction of fungicide physical modes of action and plant phenology in control of stem rust of perennial ryegrass grown for seed. Plant Dis. 90(9):p. 1225-1232. |
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| DOI: 10.1094/PD-90-1225 |
| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PD-90-1225
Last checked: 01/07/2008
Requires: PDF Reader |
| 
MSU catalog number: SB 599 .P95 |
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