Extension > Crop production > Crop Diseases > Soybean Diseases > Soybean Diagnostic

Soybean diagnostic

• Seedling Death or Seed Rot
  • Phytophthora
  • Pythium
  • Fusarium
  • Rhizoctonia Seed Rot and Root Rot
• Leaf Symptoms
  • Brown Spots
    • With yellow patches
      • Septoria Brown Spot
    • With purple rings
      • Frogeye Leaf Spot
    • With yellow rings
      • Bacterial Blight
    • With raised blisters
      • Masses of spores
        • Soybean Rust
      • No spores
        • Bacterial Pustule
  • Yellow Spots
    • with grey growth on underside
      • Downy Mildew
  • Patches or whole leaves
    • Bronze or purple leaves
      • Cercospora Leaf Blight
    • White or gray powdery patches
      • Powdery Mildew
    • Yellow and green patches
      • Bean Pod Mottle Virus
    • Light to dark green patches
      • Soybean Mosaic Virus
    • Yellow leaves (whole plant)
      • Soybean Cyst Nematode (SCN)
    • Brown spots in and beyond yellow patches
      • Septoria brown spot
    • Interveinal
      • With pith browning
        • Brown Stem Rot (BSR)
      • No pith browning
        • Sudden Death Syndrome (SDS)
• Stem Symptoms
  • External discoloration
    • White growth on stem
      • Sclerotinia Stem Rot (White Mold)
    • Grey streaks & black specks on lower stem
      • Charcoal Rot
    • Green stems when pods are ripe
      • Green Stem Syndrome
    • Black dots in rows
      • Pod & Stem Blight
    • Dark Patches
      • At branches
        • Stem Canker
      • Sunken, rusty-brown near soil line
        • Rhizoctonia rot
      • Dark patches with tiny spines
        • Anthracnose
      • Moving upwards from soil line
        • Phytophthora Root & Stem Rot
  • Internal Discoloration
    • Browning in lower stem with white pith
      • Sudden Death Syndrome (SDS)
    • Brown pith
      • Brown Stem Rot (BSR)
• Wilting or Dead Plants
  • With brown rotting roots
    • Fusarium Root Rot
  • With nematode cysts on roots
    • Soybean Cyst Nematode (SCN)
  • With stem discoloration
    • Brown discoloration moving upwards from soil line
      • Phytophthora Root & Stem Rot
    • Sunken brown lesions, near soil line
      • Rhizoctonia
    • White growth on stem
      • Sclerotinia Stem Rot (White Mold)
  • Tops of plants dying
    • Pod and stem blight