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Bean Yellow Mosaic Virus (BYMV)
BYMV is occasionally seen but is not serious in North Dakota. This virus is readily transmitted by aphids and mechanically by plant sap, but it is not seedborne. It causes plant stunting and leaves with contrasting areas of dark green and yellowed tissue. Bright yellow spots can be obvious on older plants. The virus also attacks wild hosts such as clover and sweet clover. Genes for resistance have been identified.
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