Soybean Disease Calendar

Here is an overview of common soybean diseases and their stages throughout the season.

Stage I 
Stage II 
Stage III 
Fusarium Seedling Blight, Pythium
 Seed Decay/ Damping Off
Bacterial Blight, Bean Pod Mottle Virus, Soybean Mosaic Virus, Phytophthora Root and Stem Rot, Rhizoctonia Root Rot
 Bacterial Pustule, Downy Mildew, Soybean Vein Necrosis Virus, Target Spot
  Aerial Blight, Asian Soybean Rust, Cercospora Leaf Blight, 
Frogeye Leaf Spot, SeptoriaBrown Spot, Bleeding Hilum,
Bud Blight (via Tobacco  Ringspot Virus),  Phomopsis Seed
 Decay, Pod and Stem Blight, Purple Seed Stain (via Cercospora),
Anthracnose, Brown Stem Rot, Charcoal Rot, Sclerotinia Stem 
Rot (White Mold), StemCanker, Sudden Death Syndrome 

Seedling Diseases

Fusarium Seedling Blight   (Stage I)   Photo courtesy of Darin Mueller, Iowa State University,
Fusarium Seedling Blight (Stage I)

Photo courtesy of Darin Mueller, Iowa State University,

Pythium Seed Decay/ Damping Off    (Stage I)
Pythium Seed Decay/ Damping Off (Stage I)

Foliar Diseases

Bacterial Blight
Bacterial Blight (Stage I, II, III)


Bean Pod Mottle Virus 5581650
Bean Pod Mottle Virus (Stage I, II, III)

Photo courtesy of Edward Sikora, Auburn University, 

Soybean Mosaic ( Potyvirus SMV  ) 5470054
Soybean Mosaic Virus (Stage I, II, III)

Photo courtesy of Daren Mueller, Iowa State University,

Bacterial Pustule
Bacterial Pustule (Stage II, III) 

Photo courtesy of Daren Mueller, Iowa State University, 

Downy Mildew lesions on soybean leaves.
Downy Mildew (Stage II, III)
Soybean Vein Necrosis Virus Foliar Symptoms
Soybean Vein Necrosis Virus (SVNV) (Stage II, III)
Target Spot in Soybean Leaf
Target Spot (Stage II, III)
Aerial blight
Aerial Blight (Stage III)  

Photo courtesy of Dr. Padgett, Mississippi State University.

Asian Soybean Rust  (Stage III)
Cercospora leaf blight on soybean leaf
Cercospora Leaf Blight (Stage III)
Frogeye Leaf Spot, Cerospora sojina, fungus
Frogeye Leaf Spot (Stage III)
Septoria Brown Spot  (Stage III)

Root and Stem Diseases

Phytophthora - Plants 4
Phytophthora - On Stem
Phytophthora Root and Stem Rot  (Stage I, II, III)
Rhizoctonia lesions on soybean stems. Picture courtesy of Daren Mueller, Iowa State University,  5466877
Rhizoctonia - Stem Base and Roots
Rhizoctonia Root Rot (Stage I, II, III)

Photo on left courtesy of Daren Mueller, Iowa State University,

Anthracnose lesions on soybean stem. 5469600
Anthracnose (Stage III) 

Photo courtesy of Daren Mueller, Iowa State University,

Brown discoloration of soybean stem pith due to brown stem rot
Brown Stem Rot  (Stage III)
Charcoal Rot
Charcoal Rot  (Stage III)
Sclerotinia Stem Rot (White Mold) Leaf
Scerotinia stem rot on soybean pod.
Scerotinia stem rot on soybean stem.
Sclerotinia Stem Rot (White Mold) (Stage III)

Photos courtesy of Daren Mueller, Iowa State University, 

Northern Stem Canker lesions on soybean stem
Stem Canker  (Stage III) 
Sudden Death Syndrome (SDS) Soybeans
udden Death Syndrome
Sudden Death Syndrome  (Stage III)

Pod and Seed Diseases

Bud Blight - Bud 1
Bud Blight (via Tobacco Ringspot Virus) (Stage III)
Phomopsis Seed Decay
Phomopsis Seed Decay (Stage III) 

Photo courtesy of Daren Mueller, Iowa State University,

Purple Seed Stain 5466895
Purple Seed Stain (via Cercospora)  (Stage III) 

Picture courtesy of Adam Sisson, Iowa State University.

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Corn Disease Calendar




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