Symptom types vary based on timing of infection with respect to root development and cultivar. The primary symptom on fibrous roots is the formation of black, necrotic lesions followed by rot of the root tips (Figure 4). Lesions on storage roots are typically sunken (Figure 5). As lesions age, they turn dark brown to black and tissue becomes crusty (Figure 6). Cracking radiating out from the center can be observed in some lesions. Infections prior to root enlargement result in constriction near the point of infection, giving the root a distinct dumbbell shape (Figure 7). Lesions do not develop further during post-harvest storage.