Thanks to all who have contributed to this discussion. Uli; the purple leaf is not any problem, it's the lighter striations in the leaf that I imagined were insect damage, now viral perhaps. My entire population of more than 1000 plants exhibit this condition; 99.9% of those plants are my recent seedlings. None of the plants exhibit any other signs of distress, in bulb, leaf, or flower scape. Here in Arkansas, we get late frosts, and cold snaps, and that will stunt the scape if it is developing, but all the plants are vigorous and bloom well. That is one reason I am surprised it might be a virus. I am beginning to think it might be heat stress instead, so to address that, I will raise some plants indoors here next spring, where they can have plenty of light from south-facing windows, but the temperatures will remain low. Our outside temps here in the summer reach 100 F routinely, sometimes for many days running. Thank you for your helpful thoughts and comments. I will investigate the possibility of testing my plants for virus properly. Don Kuonen _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…