Project Details:

Fusarium species infecting soybean roots: Risks and management tools

Parent Project: This is the first year of this project.
Checkoff Organization:Iowa Soybean Association
Categories:Soybean diseases
Organization Project Code:
Project Year:2009
Lead Principal Investigator:Gary Munkvold (Iowa State University)
Co-Principal Investigators:
Silvia Cianzio (Iowa State University)
Leonor Leandro (Iowa State University)
Palle Pedersen (Iowa State University)
Alison Robertson (Iowa State University)
Gregory Tylka (Iowa State University)
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Information and Results

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Project Summary

The specific objectives of this project are to:

• Characterize the frequency of Fusarium species associated with soybean root in Iowa, the occurrence of SDS foliar symptoms, and the occurrence of Fusarium virguliforme in soils from Iowa soybean fields.

• Determinate aggressiveness of predominant Fusarium species towards soybean.
• Estimate potential yield loss caused by Fusarium root rot on soybeans.
• Determine the effect of SCN infestation and SCN resistance on Fusarium root rot colonization and root rot.
• Characterize the current SDS resistance in relation to root infection; and
• Measure effects of agronomic practices (planting date, maturity group, row spacing) on SDS and Fusarium root rot under current growing conditions.

The research team has collected soybean roots from fields around Iowa at soybean growth states of R2 and R4 stages and has identified Fusarium as a predominant fungus associated with soybean roots. They have established field trial experiments to estimate possible yield loss caused by Fusarium root rot on soybeans and the effect of SCN infestation and SCN resistance on Fusarium root colonization and root rot. Data is being collected on the importance of root rot on soybean yield loss.

A greenhouse assay was developed to compare foliar and root rot symptoms in soybean lines differing in SDS resistance. Results indicated a poor relationship between foliar severity and root rot for each line, as some lines with moderate foliar resistance showed severe root rot. These studies are continuing.

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Benefit to Soybean Farmers

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