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Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances.ther forms of rust exist, like the result of reactions between iron and chloride in an environment deprived of oxygen â rebar used in underwater concrete pillars is an example â which generates green rust.
What Is 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.