Plants with Black shank wilt, turn yellow, and eventually die. Hybrid 403, a burley variety

Plants with Black shank wilt, turn yellow, and eventally die. Hybrid 403, a burley variety

Plants with Black shank wilt, turn yellow, and eventually die. Hybrid 403, a burley variety

Characteristic disking of pith tissue of the lower stem (shank) of an infected tobacco plant. Hybrid 403, a burley variety

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark variety VA 359

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco.

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco.

Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco.

Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8

Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8

Asexual spore-producing bodies called "sporangia" of the fungus Phytophthora parasitica var. nicotianae. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue.