I'm sure some of the more experienced members will reply to this, but meanwhile I did find this about the rust (not a virus)Uromyces ari triphylli: https://ask.extension.org/questions/400676/ erik On 27 August 2017 at 20:12, Jane McGary <janemcgary@earthlink.net> wrote: > I see that among the material offered in the latest BX is Arisaema > triphyllum, a North American native known as "Jack in the pulpit." I > remember reading, I think in the NARGS Quarterly long ago, that A. > triphyllum shoiuld not be planted in a garden where other Arisaema species > are grown (at least, outside its native range) because it can carry a virus > which it tolerates, but which is harmful to related species. Does anyone > know more about this? > > Jane McGary > > Portland, Oregon, USA > > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…