rubigo
/ruːˈbaɪɡoʊ/
noun
- A reddish or rusty coating or stain, especially on plants caused by rust fungus.
- The gardener noticed rubigo on the leaves of the rose bushes.
- The old iron gate was covered in rubigo from years of exposure to moisture.
- Rubigo spread quickly across the wheat field after the rainy season.
Synonyms