Tuber Blemishes

TUBER BLEMISHES

How do you distinguish between various non-rotting tuber diseases in storage. What do you look for and how are they different? The following are rough personalized descriptions for the identification of the major ones occurring periodically. These are the symptoms that I look for on tubers at harvest and in storage.

• Black Dot

• Silver Scurf

• Common Scab

• Early Blight

• Black Pit

• Late Blight

• Zebra Chip

• Net Necrosis (PLRV)

• Vascular Discoloration

Some tuber blemishes other than those listed may be found in other sections:

Black Scurf -- Refer to Rhizoctonia solani under WILTS.

Vascular Discoloration -- Refer to Verticillium spp. under WILTS.

Bacterial Soft Rot -- Refer to WILTS and WET ROTS.

Leak and Pink Rot -- Refer to Wet Rots.

Dry Rot -- Refer to Fusarium spp. under WILTS.