The importance of Fusarium and Pythium species in seed decay and root rot on soybean

The importance of Pythium spp. in seed and root rot symptoms on soybean seedlings has been well documented, but information about individual species of Fusarium on seeds and roots is limited. The objective of this research was to evaluate the role of P. irregulare, P. mamillatum and the Fusarium spp...

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Bibliographic Details
Published in:Phytopathology 2008-06, Vol.98 (6), p.S16-S16
Main Authors: Avanzato, M V, Rupe, J C, Rothrock, C S
Format: Article
Language:English
Subjects:
Fusarium
Pythium
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Summary:The importance of Pythium spp. in seed and root rot symptoms on soybean seedlings has been well documented, but information about individual species of Fusarium on seeds and roots is limited. The objective of this research was to evaluate the role of P. irregulare, P. mamillatum and the Fusarium spp.: F. tricinctum, F. oxysporum and F. equiseti on seedling establishment. All the isolates evaluated were recovered from soybean roots or seeds grown in a naturally infested field soil from Hope, Arkansas, under controlled environmental conditions. The pathogenicity of individual isolates of Fusarium and Pythium was determined in controlled environmental conditions using artificially infected soilless potting media at 23C. A seed germination assay also was conducted at room temperature with Fusarium spp. Results showed a wide range in plant stands but little root discoloration, among Fusarium isolates. Pythium isolates also showed differences in plant stands, but root discoloration was more severe than for Fusarium isolates. Screening for Fusarium pathogenicity by the seed germination assay was not comparable to the soil infestation technique. Interaction between isolates of Fusarium spp. and Pythium spp. on soybean is being investigated using a soil infestation technique.
ISSN:0031-949X