Summary of relationships among management
practices and soybean diseases. Craig
Grau, University of Wisconsin
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Brown Stem Rot
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White Mold
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Phytophthora Root Rot
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Soybean Cyst Nematode
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Seedling Blight
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Early
Planting Date
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Negates
benefits
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Greater severity and yield loss
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Greater seedling mortality
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Greater invasion of roots, unknown yield effect
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Greater in cool-wet soils
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High Plant Population
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Negates
benefits
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Greater severity and yield loss
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Unknown
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Unknown
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May compensate for seedling mortality
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Narrow Row-Width
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Negates
benefits
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Greater severity, negates yield advantage
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Unknown
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Unknown
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Unknown
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Fungicide-
treated seed
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No documented effect
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No documented effect
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Apron® effectively reduces seedling mortality phase
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None available
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Apron®, Rival® effective; respond to no-till and early planting
date systems
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Crop rotation schemes
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2-3 years of nonhost extremely effective. Improves yield
of both resistant and susceptible varieties.
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2-3 years of nonhost beneficial, but rotation effect improved
by planting less susceptible varieties.
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Limited value
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2-3 years of nonhost beneficial. Improves yield of resistant
and susceptible varieties.
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Limited value
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No tillage
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Greater severity and yield loss
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No-till in nonhost year enhances death of Sclerotinia sclerotia.
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Greater severity and yield loss
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Lower SCN population, greater yield
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Greater severity and yield loss
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Soil fertility and tilth
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Higher K and pH, and supplemental N, reduce severity and
improve yield
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High fertility, dense canopy result in greater severity
and yield loss.
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Additional N results in greater severity and yield loss
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Minimal effects. High K may be beneficial
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Compaction results in greater severity and yield loss
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Weed management
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Modest suppression by Pusuit® herbicide
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Significant suppression by Cobra®. Disruption of sclerotia
by atrazine. Disruption of sclerotia by cultivation.
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Unknown
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Suppression of SCN reproduction by Blazer® herbicide.
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Preemergent herbicides suspected of reducing seedling vigor
resulting in greater seedling mortality.
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