Recognize this disease?

[jason30809]

I have scrolled and scrolled and scrolled but there are so many diseases that look similar that I am unable to determine what this is or what if anything, can be done about it. Its not in the pic but one of these plants appears to have a dark colored, necrotic line going down the stem towards the roots. Any thoughts?

 

[deluxestogie]

It's always difficult to guess. The last photo, showing one half of a leaf affected, as well as the possible vascular injury in the stalk, suggest Fusarium wilt.

Fusarium wilt Fusarium oxysporum f.sp. nicotianae (Johnson) W.C. Snyder & H.N. Hansen

www.ipmimages.org

Fusarium Wilt | Burley Tobacco Extension

Fusarium wilt is caused by a soil-borne fungus that can persist in fields for many years. Symptoms include wilting, yellowing, and leaf distortion. Single plants or clusters of plants may show symptoms. (Photo: Kenneth Seebold, UK) Fusarium wilt generally affects one side of a tobacco plant...

burleytobaccoextension.ca.uky.edu

There are numerous other possibilities.

Bob