Cause Beet western yellows virus has a very broad host range including crucifers, (both weedy and cropped). The virus persists in aphid vectors for more than 50 days.
Symptoms Older leaves turn chlorotic, yellowish spots appear between leaf veins, grow larger, and often merge. The leaves become thickened and brittle. Infected leaves are often attacked by secondary fungi.
- Separate new plantings from infected fields.