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Wikipedia definition
1. Rust (fungus)Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales (previously also known as Uredinales). About 7800 species are known. Rusts can affect a variety of plants; leaves, stems, fruits and seeds. Rust is most commonly seen as coloured powder, composed off tiny aeciospores which land on vegetation producing pustules, or uredia, that form on the lower surfaces.
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