Scab of Potato
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Scab (Streptomyces scabies) symptoms on tubers include rough, raised lesions that are variable in shape and size. Lesions (scabs) may have a corky texture and range from superficial to those that extend deep into tubers. This disease is most problematic where soil pH is above 5.5.
Scab.
(Photo: Blair Janson, Bugwood.org)
Management:
- Select resistant cultivars
- Plant pathogen-free seed pieces
- Maintain proper soil pH (between 5.0 and 5.2)
- Provide adequate soil moisture
- Rotate to non-host crops
- Promptly destroy crop residues after harvest
- Deep plow to bury residual inoculum
