gummy stem blight / black rot of pumpkin

Gummy stem blight/black rot-Gummy stem blight is the name for symptom on leaves or stems. Black rot is the name for symptoms due to the same pathogen on fruit. Gummy stem blight symptoms are not economically important on pumpkin in Indiana. Black rot problems occasionally cause marketability issues. The latter symptoms can sometimes appear as a ring structure which may appear to be virus-like symptoms. However, dark fruiting bodies in the lesions are diagnostic. 

Gummy stem blight lesion on a pumpkin leaf. Figure 1. Gummy stem blight lesion on a pumpkin leaf.
Black rot of pumpkin. Note target spot-like pattern of lesion. Figure 2. Black rot of pumpkin. Note target spot-like pattern of lesion.
Close-up of black rot lesion on pumpkin. Figure 3. Close-up of black rot lesion on pumpkin.