Term: Rust
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Rusts like to attack healthy plants in order to steal nutrients from living cells. They are recognized by characteristic brown, black, or orange leaf spots and/or a powdery rust-colored coating on the undersides of foliage. If left untreated, rusts can cause a systemic infection returning yearly on perennial plants resulting in stunted or abnormal growth and chlorosis (a yellow discoloration). A diluted neem oil solution will help prevent spread by smothering present spores.