Soybean Seedling Diseases

  • 13;10; 13;10;9;9;9;9;9;Soybean seedling diseases are often caused by fungal pathogens, which can slow germination and plant growth, and kill seedlings.13;10;9;9;9;9;13;10;
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  • 13;10; 13;10;9;9;9;9;9;Conditions that favor disease development are cool to warm temperatures and wet, poorly drained soils.13;10;9;9;9;9;13;10;
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  • 13;10; 13;10;9;9;9;9;9;Once the pathogens that cause diseases are present within the environment they cannot eliminated and must be managed to reduce yield loss.13;10;9;9;9;9;13;10;
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Diseases, Pathogens, and Symptoms

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13;10;9;9;9;9;9;There are three main categories of soybean seedling diseases: 

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Seed rot (V0-VE growth stages): 

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  • Fungal pathogens: Pythium, Phytophthora, and Phomopsis.
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  • Typical symptoms: soft decay of the seed and missing seedlings in the row or poor emergence. 
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Seedling mortality (damping-off or seedling blight) (VE-V4 growth stages):

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  • Fungal pathogens: Pythium (Figure 1), Phytophthora (Figure 2), Rhizoctonia (Figure 3), and sometimes Fusarium.
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  • Typical symptoms: hypocotyl appears pinched and rotted. Yellowed and wilted leaves later turn brown. Leaves remain attached to the stem after plant death.
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