Powdery mildew affects tomatoes, bee balm, phlox and lilacs, among other plants. “You get white bloom on the leaves that inhibits photosynthesis,” Kemery explained. This type of fungus is an ...

Powdery mildew can affect numerous plants, but some species are particularly ... Vegetables like courgette, squash, cucumbers, tomatoes, and melons are particularly susceptible to powdery mildew.