Soybean growers this fall may have problems with green stem and mottled seed. Many of the problems may be caused by bean pod mottle virus (BPMV) or soybean mosaic virus (SMV). Both viruses cause the same leaf symptoms, green stem in the fall, and mottled seed coats. BPMV is transmitted primarily by bean leaf beetle; SMV is transmitted by at least 30 aphid species, including the newly introduced soybean aphid. Many soybean cultivars do not display obvious symptoms, and there is no positive correlation between severity of leaf symptoms and amount of seed coat mottling on fall-harvested seed.
Iowa State University
Hill, John H., "Virus-induced soybean seed problems" (2001). Integrated Crop Management News. 1861.
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