scurf of sweet potato

Figure 1. Scurf of sweet potato. Note gray, brown stain on surface. Holes are not necessarily a symptom of scurf. Figure 1. Scurf of sweet potato. Note gray, brown stain on surface. Holes are not necessarily a symptom of scurf.
Figure 2. Scurf of sweet potato. Note gray, brown stain on surface. Figure 2. Scurf of sweet potato. Note gray, brown stain on surface.
Figure 3. Scurf of sweet potato. Figure 3. Scurf of sweet potato.
Figure 4. Scurf of sweet potato. Figure 4. Scurf of sweet potato.