Gummy Stem Blight
Causal Agent: (fungus ‑ Didymella bryoniae)
Early symptoms are round black, wrinkled spots on young leaves and dark sunken areas on stems. Early infection usually develops from contaminated seed and can be visible on transplants (Image 1).
Often, infected transplants will have lesions on the the stem (Image 2
On older leaves in the field, irregular brown to black spots develop between leaf veins (Image 3).
Leaf lesions will expand (Image 4