Sudden Death Syndrome is actually a crown rot and root rot of soybean plants even though foliar symptoms can be dramatic. Yield losses occur with this disease when infections occur prior to or during flowering. Foliar symptoms appear very similar to brown stem rot, but there are distinct chlorotic spots on the leaves during early stages of foliar symptom development. The key diagnostic feature is that plants have few roots and the crown is a gray color. If the soil has been wet, sometimes the blue-green spores of the fungus can be seen on the tap root. This disease has limited distribution in Ohio. It has been reported from a few fields scattered throughout the state and tends to be associated with areas where the soil is compacted, SCN is present, and heavy rains have occurred during the growing season.
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| Figure 24. Sudden death syndrome. Tap root is discolored. | Figure 25. Foliar symptoms of sudden death syndrome caused by Fusarium solani f. sp. glycines. The spots are scattered and a bright yellow. | Figure 26. Advanced foliar symptoms of sudden death syndrome, where yellow spots have developed into brown areas of dead tissue. |
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