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Rusts are the best known examples of obligate fungus parasites . We're primarily looking at visual type defects where there 's rust or the packaging is damaged , or something is wrong with a certain component . Fusiform rust : a fungus-caused disease which produces spindle-shaped swellings or cankers on the branches and main stem of pines . Examples are the duty not to let one 's talents rust or the duty not to deny help to others . The extermination of the hemp as a weed would be very much less difficult than the extermination of the common barberry , which has been done to safeguard farmers against wheat rust or the extermination of wild currants to save the white pine trees from the white-pine blister rust . Perhaps the best example in the Rust Belt these days is Kalamazoo , an aging and struggling industrial Michigan city . The SI fungicide treatments ( fenbuconazole and myclobutanil-plus-mancozeb ) controlled cedar apple rust and suppressed quince rust but the strobilurin fungicides ( kresoxim-methyl and trifloxystrobin ) did not . What is left from this process of corrosion is metal in the form of rust or the dusty material you can rub off an aluminium window frame , " says Mr Neufeld .