Common Soybean Diseases 

Even with Fall approaching quickly and harvest on the horizon it is not time to quit scouting fields. Soybean diseases can creep up on you and steal some of your yield. Here are a few common diseases in our area:

White Mold

• Stem lesions begin as water-soaked spots near nodes
 • Lesions enlarge, fluffy white fungal growth develops on moist stems
• Hard black structures known as sclerotia form on infected tissue
• Infected stems become bleached white and may shred

This disease is more common when there is frequent wetness, dense plant canopy, high fertility and a high plant population.

Sudden Death Syndrome (SDS)

• Yellow and brown discoloration between leaf veins
• Tan stem under the epidermis near the soil line, while pith remains white
• Symptoms develop in plant seed fill stages (August)
• Root rot and occasionally blue fungal growth on root
• Leaflets can fall and petioles remain attached to the plant

This disease is most common in wet fields, compacted fields with poor drainage and fields with high soybean cyst nematode populations.


Brown Stem Rot (BSR)

• Brown pith in stem, especially in the lower stem
• Symptoms commonly develop in mid-August
 • Brown and yellow discoloration between leaf veins may be present

This disease is most common in fields with short/ no rotation, wet fields, susceptible varieties and when soybean cyst nematodes are present.

For more details on the diseases listed above as well as an extensive list with descriptions and pictures take a look at this great diagnostic booklet by NDSU: /getmedia/33ba8639-8a24-4a6e-8f0f-f5ef33be9576/soybeandiseases

If you have any questions about soybean diseases or think your fields may be at risk, contact your local Centra Sota Crop Advisor.

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