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| Disease: Mosaic Virus |
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Soybean Mosaic Virus - Symptoms
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| Foliar symptoms of SMV infection sometimes include a mosaic appearance consisting of light and dark green areas. Photo credit: Laura Sweets, University of Missouri. |
General symptoms of SMV are plant stunting, leaf distortion and mottling, reduced pod numbers, and seed discoloration. Plant reaction to infection by SMV depends on the soybean variety.
Leaf symptoms include a mosaic of light and dark green areas, chlorosis, rugose (rough) leaves, and leaf curl. The youngest and most rapidly growing leaves show the most symptoms. Symptoms are most severe at cooler temperatures (less than 25°C).
Plants can be stunted, with shortened petioles and internodes. Symptoms can resemble injury from herbicide drift.
Infected pods are small, flat, have less hair, and are more curved than pods that are not infected with virus. Seed discoloration may occur, and seed germination may be reduced.