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Black shank of tobacco is a disease caused by a funguslike organism (an Oomycete) called Phytophthora parasitica var. nicotianae. Stunting and wilting are common symptoms in the early stages of black shank disease. Close examination of an infected plant often reveals a dark discoloration of one or more of the larger roots and of the interior of lower regions of stalks. A dark discoloration or lesion along the shank of the plant is often observed also. In advanced stages of the disease, the tissues in the center of the stalks become blackened, and, as the pith dries, it segments into discs.
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