Donald M. Ferrin, Hadziabdic, Denita, Hollier, Clayton A., Overstreet, Charles
Downy mildew. The internal darkening of broccoli florets is caused by systemic invasion of the fungus Peronospora parasitica. Infected plants develop a gray mold on the lower leaf surface only, in contrast to powdery mildew. On the upper leaf, Yellowing and necrosis are observed on the upper leaf surface.
The LSU AgCenter and the LSU College of Agriculture