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In page Rust (fungus):

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It is probable that most plant species are affected by some species of rust.[citation needed] Rusts are often named after a host species that they infect. For example; Puccinia xanthii infects the flowering plant cocklebur (Xanthium). Recently, a total of 95 rust fungi belonging to 25 genera associated with 117 forest plant species belonging to 80 host genera under 43 host families were reported from the Western Ghats, Kerala, India.[1] Rust fungi include: