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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.
Rust is caused by a fungal disease that creates brown-, orange- or rust-colored dots or pustules to appear on the hollyhock foliage. If not treated, rust results in wilted and discolored leaves that fall from the hollyhock. Splashing water and wind easily spread the fungus from one plant to another.