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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2006.96.6.S1#page=71
Last checked: 10/20/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Ma, B.;
Uddin, W.;
Olaya, G. |
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| Author Affiliation: | Ma and Uddin: Pennsylvania State University, University Park, Pennsylvania; Olaya: Syngenta Crop Protection, Vero Beach, Florida |
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| Title: | Dynamics of azoxystrobin-resistant Magnaporthe grisea causing gray leaf spot of perennial ryegrass (Lolium perenne) turf |
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| Section: | APS abstracts submitted for presentation at the 2006 APS Annual Meeting
Other records with the "APS abstracts submitted for presentation at the 2006 APS Annual Meeting" Section
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| Source: | Phytopathology. Vol. 96, No. 6, June Supplement 2006, p. S71. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Pyricularia grisea; Azoxystrobin; Gray leaf spot; Lolium perenne; Fungicides; Fungicide combinations; Fungicide resistance
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| Abstract/Contents: | "An azoxystrobin-resistant G143A mutant of Magnaporthe grisea was compared with a sensitive wild type strain regarding fitness and competitive ability by using a detached leaf method. Inoculation of ryegrass plants with both strains revealed that the sensitive strain was significantly more virulent than the G143A mutant, based on disease severity assessment (P = 0.05). However, the G143A mutant exhibited significantly greater sporulation. In absence of fungicide, the frequency of conidia produced by the sensitive strain increased, and that of the mutant decreased after symptom development. In the presence of azoxystrobin, propiconazole, thiophanate-methyl, chlorothalonil, mancozeb, and half-rate mixtures of the three systemics with chlorothalonil or mancozeb, azoxystrobin treatment replaced 95% of the sensitive strain with 5% of the mutant in the initial inocula. The 5% mutant was eliminated by the rest of fungicide treatments, including half-rate mixtures of azoxystrobin with chlorothanlonil or mancozeb. The results of this study demonstrate that the sensitive strain of M. grisea has competitive advantages over the mutant in absence of fungicides. Mixtures and alternations of fungicides with different mode of action may prevent rapid build-up of resistance population in gray leaf spot pathosystem." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ma, B., W. Uddin, and G. Olaya. 2006. Dynamics of azoxystrobin-resistant Magnaporthe grisea causing gray leaf spot of perennial ryegrass (Lolium perenne) turf. Phytopathology. 96(6):p. S71. |
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| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2006.96.6.S1#page=71
Last checked: 10/20/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 599 .P48 |
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