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Rust is a type of parasite that can only survive on living plants. It is called rati, rauva, cobra in different local languages. Rust is recognizable by its rusty-looking pustules on the host plants. is an obligate parasite which survives only on living host plants. The rusts are known as rati, rauva, cobra in local languages in different parts of our country. The characteristic feature of rust is the presence of pustules of rusty appearance on the surface of the host plants.