Abstract
Sudden death syndrome (SDS), caused by the fungal pathogen Fusarium virguliforme , causes significant yield reductions in soybean [ Glycine max (L.) Merr.] in the United States. Appropriate recommendations to manage SDS for growers in Iowa and the Upper Midwest are limited. The research objective was to determine the response of SDS foliar disease incidence, severity, and yield to row spacing and seeding rate. In 2008 and 2009, at two Iowa locations, in fields with histories of SDS, SDS‐susceptible and SDS‐resistant cultivars were planted at 38‐ and 76‐cm row spacing at seeding rates of 185,000, 309,000, and 432,000 seeds ha −1 in plots infested with and without the pathogen. Sudden death syndrome incidence and severity were very low; however, infested plots had greater SDS disease incidence and severity than uninfested plots. A row spacing × infestation interaction indicated 7% greater yield in narrow rows (38 cm) than wide rows (76 cm) in uninfested plots, with no yield advantage to narrow rows in infested plots. Soil infestation reduced soybean seed mass (7%) in narrow rows, explaining the yield reduction for narrow rows with greater SDS. The two highest seeding rates had increased SDS incidence but yielded 9% greater than the lowest seeding rate. The susceptible cultivar had greater SDS incidence and severity and yielded 7% less than the resistant cultivar. This study indicates that in infested plots with greater SDS symptom expression, the yield advantage of narrow rows may be negated; therefore, cultivar selection is crucial when planting in narrow rows to maximize yield.
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Claims 9
Claim · model-written summary
Infested soybean plots had greater SDS incidence and severity.
- Taxon
- soybean
Glycine maxt0 - Treatment
- infested plotse0
- Interactor
- SDSe0pathogen
- Outcome
- SDS disease incidence and severitye0
- Direction
- greatere0
- Comparator
- uninfested plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infested plots had greater SDS disease incidence and severity than uninfested plots.”
t0“Soybean”
Claim · model-written summary
Narrow rows yielded 7% more than wide rows in uninfested plots.
- Taxon
- soybeanGlycine maxt0
- Treatment
- narrow rows (38 cm)e0
- Outcome
- yielde0
- Direction
- greatere0
- Value
- 7%e0
- Qualifier
- in uninfested plotse0
- Comparator
- wide rows (76 cm)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“7% greater yield in narrow rows (38 cm) than wide rows (76 cm) in uninfested plots, with no yield advantage to narrow rows in infested plots.”
t0“Soybean”
Claim · model-written summary
Narrow rows had no yield advantage in infested plots.
- Taxon
- soybeanGlycine maxt0
- Treatment
- narrow rowse0
- Outcome
- yielde0
- Direction
- no yield advantagee0
- Qualifier
- in infested plotse0
- Comparator
- wide rowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“7% greater yield in narrow rows (38 cm) than wide rows (76 cm) in uninfested plots, with no yield advantage to narrow rows in infested plots.”
t0“Soybean”
Claim · model-written summary
Infestation reduced soybean seed mass by 7% in narrow rows.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Soil infestatione0
- Outcome
- soybean seed masse0
- Direction
- reducede0
- Value
- 7%e0
- Qualifier
- in narrow rowse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil infestation reduced soybean seed mass (7%) in narrow rows, explaining the yield reduction for narrow rows with greater SDS.”
Claim · model-written summary
The two higher seeding rates increased SDS incidence.
- Taxon
- soybeanGlycine maxt0
- Treatment
- two highest seeding ratese0
- Interactor
- SDSe0pathogen
- Outcome
- SDS incidencee0
- Direction
- increasede0
- Comparator
- lowest seeding ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two highest seeding rates had increased SDS incidence but yielded 9% greater than the lowest seeding rate.”
t0“Soybean”
Claim · model-written summary
The two higher seeding rates yielded 9% more than the lowest rate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- two highest seeding ratese0
- Outcome
- yieldede0
- Direction
- greatere0
- Value
- 9%e0
- Comparator
- lowest seeding ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two highest seeding rates had increased SDS incidence but yielded 9% greater than the lowest seeding rate.”
t0“Soybean”
Claim · model-written summary
The susceptible cultivar had greater SDS incidence and severity than the resistant cultivar.
- Taxon
- soybeanGlycine maxt0
- Material
- susceptible cultivare0
- Interactor
- SDSe0pathogen
- Outcome
- SDS incidence and severitye0
- Direction
- greatere0
- Comparator
- resistant cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The susceptible cultivar had greater SDS incidence and severity and yielded 7% less than the resistant cultivar.”
t0“Soybean”
Claim · model-written summary
The susceptible cultivar yielded 7% less than the resistant cultivar.
- Taxon
- soybeanGlycine maxt0
- Material
- susceptible cultivare0
- Outcome
- yieldede0
- Direction
- lesse0
- Value
- 7%e0
- Comparator
- resistant cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The susceptible cultivar had greater SDS incidence and severity and yielded 7% less than the resistant cultivar.”
t0“Soybean”
Claim · model-written summary
The authors recommend careful cultivar selection for narrow rows in SDS-infested fields.
- Taxon
- soybeanGlycine maxt0
- Outcome
- cultivar selection is crucial when planting in narrow rows to maximize yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivar selection is crucial when planting in narrow rows to maximize yield.”
t0“Soybean”
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infection · yield · Glycine max (soybean)Results differ
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1 paper in the same direction as this paper
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.