They are short-day growers. If they get light for more than 12 hours a day (including lamp light) they start going dormant as they should in May. Gianluca Corazza, Italy. Il giorno mar 21 gen 2020 alle ore 16:20 Arnold Trachtenberg via pbs < pbs@lists.pacificbulbsociety.net> ha scritto: > I've had these Arums for a number of years. A. palaestinum, A. korolkowii > and an Arum I was given by a colleague in Puglia, Italy. > The soil has been changed and pots sterilized more than once. > I feed with an organic fertilizer Down to Earth which is a blend of > organic components. > I have them under some T-5 LED lights in a cool greenhouse not below 45-50 > F. > Any suggestions would be most appreciated as to how to correct this > condition. > > This has occurred for 3-5 years. The initiate growth and around this time > of year the leaf wilt appears. > Thanks in advance.Arnold New Jersey > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: Arum.disease.2020.1.JPG > Type: image/jpeg > Size: 373922 bytes > Desc: not available > URL: < > http://lists.pacificbulbsociety.net/pipermail/pbs/… > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: Arum.disease.2020.2.JPG > Type: image/jpeg > Size: 297409 bytes > Desc: not available > URL: < > http://lists.pacificbulbsociety.net/pipermail/pbs/… > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: Arum.disease.2020.JPG > Type: image/jpeg > Size: 328437 bytes > Desc: not available > URL: < > http://lists.pacificbulbsociety.net/pipermail/pbs/… > > > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…