- Soybeans are susceptible to infection at all stages of development. Plants and seeds may be infected.
- If the infected seed is planted, early disease development may result in damping-off (seed or seedling rot causing plant death). Dark brown lesions develop on cotyledons, the stem may collapse, and seedlings may die under severe infection.
- Most commonly, however, plants become infected during bloom and pod fill (reproductive stages) due to spores spread from infected plant residue.
- Symptoms appear on stems, pods, and leaf petioles as irregularly-shaped brown blotches.
- Severe symptoms may include leaf rolling, premature defoliation, and stunted plants. Pods may be shriveled and contain less seed, moldy seed, or no seed
- In some cases, pods can be diseased, and the seed may be infected but without symptoms in the seed.
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