southern blight of tomato
Southern blight-Often the initial symptom of this disease is the sudden wilt and decline of the plant. Closer observation will show a lesion at soil level. Lesions will have small light brown fungal structures known as sclerotia. Causal fungus will affect many other crops. Not common in Indiana.
Figure 1. Southern blight can be recognized by the small sclerotia at the base of the stem. These lesions will eventually result in the wilting of the plant. 
Figure 2. Close up of southern blight of tomato lesions. Sclerotia become darker as they age. Red arrow indicates sclerotia. 
Figure 3. Southern blight of tomato. 
Figure 4. Base of plant with southern blight of tomato. Note sclerotia.