UW Soybean Plant Health

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Effect of specific management practices on soybean diseases 
 
 

Brown Stem Rot

 White Mold

Phytophthora Root Rot

SCN

Seedling Blight
Early
Planting Date		 Presence of BSR negates
benefits		 Greater severity and yield loss Greater seedling mortality Greater invasion of roots, unknown yield effect Greater in cool-wet soils
High Plant Population

Presence of BSR negates
benefits

Greater severity and yield loss

Unknown

 Unknown May compensate for seedling mortality
Narrow Row-Width Presence of BSR negates
benefits		 Greater severity, negates yield advantage Unknown Unknown Unknown
Fungicide-
treated seed		 No documented effect No documented effect Apron® effectively reduces seedling mortality phase None available Apron®, Rival® effective; respond to no-till and early planting date systems
Crop rotation schemes 2-3 years of nonhost extremely effective. Improves yield of both resistant and susceptible varieties. 2-3 years of nonhost beneficial, but rotation effect improved by planting less susceptible varieties. Limited value 2-3 years of nonhost beneficial. Improves yield of resistant and susceptible varieties. Limited value
No tillage Greater severity and yield loss No-till in nonhost year enhances death of Sclerotinia sclerotia. Greater severity and yield loss Lower SCN population, greater yield Greater severity and yield loss
Soil fertility and tilth Higher K and pH, and supplemental N, reduce severity and improve yield High fertility, dense canopy result in greater severity and yield loss. Additional N results in greater severity and yield loss Minimal effects. High K may be beneficial Compaction results in greater severity and yield loss
Herbicides Significant suppression by Cobra®. Disruption of sclerotia by atrazine. Disruption of sclerotia by cultivation. Unknown Preemergent herbicides suspected of reducing seedling vigor resulting in greater seedling mortality. Suppression of SCN reproduction by Blazer® herbicide.  

 
 


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