black leg of potato
Blackleg of potato-Often the first symptom one might notice is the wilt and collapse of potato plants. Upon closer examination, the stems of such plants may be dark and slimy. These symptoms may extend down into the roots and into the seed potato. Two genera may be responsible for this disease in the Midwest: Pectosporium and Dickeya. The latter genus used to be regulated.
Figure 1. Often the first symptom of black leg of potato that is noticed is a wilt. 
Figure 2. Initial symptoms of black leg of potato. 
Figure 3. The base of the stem of potato plants affected with black leg is often dark and slimy. 
Figure 4. Base of potato plant affected with black leg. 
Figure 5. Collapse, wilt and dark stems caused by black leg of potato. 
Figure 6. Black leg of potato. 
Figure 7. Dark, slimy stem of potato plant with black leg. 
Figure 8. Black leg of potato may affect only occasional plants. At least initially.