Distribution
Puccinia emaculata appears to be widespread on switchgrass (Panicum virgatum) in the US, with reports from at least 10 US states as well as in Mexico (Farr,et.al; Creswell personal communication)Behavior
Puccinia emaculata, like other rust fungi, may be spread long distances by wind. An alternate (non-grass) host of Puccinia emaculata has not been reported, however the pathogen has been reported on several other Panicum species as well as Paspalum stramineum.References:
Some text fragments are auto parsed from Wikipedia.
https://wiki.bugwood.org/Puccinia_emaculata_(switchgrass_rust)