Rusts Rust is causing a lot of leaf damage late this season. This year is unusual because the majority of rust in most parts of the state is southern rust, caused by Puccinia polysora. The hot, humid weather earlier this summer probably had an influence on the prevalence of southern rust. Yield loss may occur due to the leaf damage alone, and additional yield loss will occur if plants die prematurely. Southern rust symptoms.
Southern rust is caused by Puccinia polysora .
Southern rust telia. Common rust pustules and spores. Common rust is caused by Puccinia sorghi . Common rust causing death of leaf tissue. Producers who intend to chop and feed rust-infested corn silage will no doubt wonder about the forage quality and potential animal health risks.