Cause The fungus, Mycocentrospora sp., has been associated with this disease on parsley in the Willamette Valley of Oregon. The fungus usually is a problem on carrot but has a wide host range of weed species. It is favored by cool soils.
Symptoms A red discoloration and lesions on roots; and lesions on petioles.
- Crop rotation.
- Plant later when soil temperature is warm.