Bud Blight

Guy Padgett  |  4/22/2013 11:56:34 PM

Bud blight tobacco ringspot.

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Bud Blight
Melvin Newman
University of Tennessee

Bud blight, caused by the tobacco ringspot virus (TRSV), can be a serious disease of soybeans. Yields may be reduced 25-100% depending on the time of infection. The virus is spread by planting infected seed, but the amount of infected seed produced is usually extremely low.

Infected plants are stunted and the pith of stems and branches show a brown discoloration, first near the nodes, then throughout the stem. Leaves on infected plants are smaller, wrinkled, and have a bronze discoloration. Buds become brown, necrotic, and barittle; hence the name bud blight. The most strinking symptom is the curving of the terminal bud to form a crook. Diseased pods are often aborted or contain no seed. In the field, plants that are infected remain green after healthy plants have matured.
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