You searched for: “rubigo
rubigo (s) (noun) (no plural)
A kind of rust that is on plants, consisting of a mildew or a parasitic fungus: "Rubigo is a plant disease that is caused by a rust fungus which is characterized by reddish or brownish spots on leaves, stems, and other parts of plants."
This entry is located in the following unit: rub-, rubi- (page 1)
Word Entries containing the term: “rubigo
Aerugo animi rubigo ingenii. (Latin proverb)
The rust of the mind is the destruction of genius.

Alfred Henderson, Latin Proverbs, page 10 (1869), quoting Seneca. An equivalent English proverb: "I had rather wear out than rust out." Written by George Whitfield in his Remark (c. 1770).