It is caused by a different pathogen (Puccinia hordei) to the one associated with brown rust in wheat and there is no cross-infection between the two crops. Indeed, ...

Sporogenesis in pycnia of Puccinia sorghi is annellophoric, but at secession the spore retains the septal lamella and at least part of the lower septal wall. Pycniospores are bounded by a thin (±65 nm ...