Phialophora gregata: Difference between revisions
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Depending on which strain infects the plant, genotype A or genotype B, the effect is more or less potent. Genotype A causes browning of stems as well as foliar symptoms such as interveinal chlorosis, defoliation and wilting <ref name="Grau" /> <ref name="Robertson & Tabor"> |
Depending on which strain infects the plant, genotype A or genotype B, the effect is more or less potent. Genotype A causes browning of stems as well as foliar symptoms such as interveinal chlorosis, defoliation and wilting <ref name="Grau" /> <ref name="Robertson & Tabor"> |
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Robertson, A. & Tabor, G. “Soybean Brown Stem Rot.” Iowa State University. <http://www.extension.iastate.edu/Publications/PMR1004.pdf.>2012. </ref>. Symptomatic leaves have a shriveled appearance, but remain attached to the stem |
Robertson, A. & Tabor, G. “Soybean Brown Stem Rot.” Iowa State University. <http://www.extension.iastate.edu/Publications/PMR1004.pdf.>2012. </ref>. Symptomatic leaves have a shriveled appearance, but remain attached to the stem <ref name="Robertson & Tabor" />. These foliar symptoms can often be confused by those caused by the pathogen Fusarium virguliforme, which causes Sudden Death Syndrome in soybean <ref name="Robertson & Tabor" /> <ref name="Monsanto" />. Genotype B causes only browning of stems <ref name="Robertson & Tabor" />. |
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Secondary symptoms of brown stem rot are stunting, premature death, decrease in seed number, reduced pod set, and decrease in seed size. <ref name="Robertson & Tabor" />. |
Secondary symptoms of brown stem rot are stunting, premature death, decrease in seed number, reduced pod set, and decrease in seed size. <ref name="Robertson & Tabor" />. |
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== External links == |
== External links == |
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Revision as of 01:36, 4 December 2012
| Phialophora gregata | |
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| Scientific classification | |
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| Species: | P. gregata
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| Binomial name | |
| Phialophora gregata (Allington & D.W. Chamb.) W. Gams, (1971)
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| Synonyms | |
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Cadophora gregata | |
Phialophora gregata is an ascomycete fungus that is a plant pathogen that causes the disease commonly known as "brown stem rot of soybean." The fungus exists infects as two strains [1]. P. gregata does not produce survival structures.
Symptoms and Signs
Phialophora gregata’s infection of a soybean plant is accompanied by browning of the plant’s vascular and pith tissues[1]. The plant often exhibits chlorosis and necrosis, as well as leaf browning.[1] Wilting and defoliation are also known to occur. [1] Signs of infection often go unnoticed until reproductive stages of a plant’s life cycle. They can be diagnosed earlier on by opening the stem and visualizing the pathogen. One can visualize signs by cutting open the stem in early stages of infection [1], but symptoms do not become apparent until after the soybean pod formation [2].
Depending on which strain infects the plant, genotype A or genotype B, the effect is more or less potent. Genotype A causes browning of stems as well as foliar symptoms such as interveinal chlorosis, defoliation and wilting [1] [3]. Symptomatic leaves have a shriveled appearance, but remain attached to the stem [3]. These foliar symptoms can often be confused by those caused by the pathogen Fusarium virguliforme, which causes Sudden Death Syndrome in soybean [3] [2]. Genotype B causes only browning of stems [3]. Secondary symptoms of brown stem rot are stunting, premature death, decrease in seed number, reduced pod set, and decrease in seed size. [3].
External links
 | This plant disease article is a stub. You can help Wikipedia by expanding it. |
 | This Ascomycota-related article is a stub. You can help Wikipedia by expanding it. |
References
- ^ a b c d e f Grau, C. "Brown Stemrot of Soybeans." <http://fyi.uwex.edu/fieldcroppathology/files/2010/11/bsr_063.pdf>
- ^ a b Monsanto. "Brown Stem Rot and Sudden Death Syndrome in Soybean." Lewis Hybrids. Lewis Hybrids, 2010. Web. <http://www.lewishybrids.com/files/File/Agronomic%20Spotlight%20-%20Brown_Stem_Rot_Sudden_Death_Soy.pdf?PHPSESSID=0c6bc72c5c097a7e80e53605fd2effce>
- ^ a b c d e Robertson, A. & Tabor, G. “Soybean Brown Stem Rot.” Iowa State University. <http://www.extension.iastate.edu/Publications/PMR1004.pdf.>2012.