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. Forage quality may be lowered primarily because of the early death of the plant. There are no known toxic effects from feeding rust-infected corn silage. An obvious concern would be the palatability of the forage when mixed with the rust fungus.