The question is what was the actual cause of death when transitioning from the baggie to soil. Was it really fungal disease? I never used sterilized soil and sometimes the compost has some white mold on it, and it still works. I use organic potting soil with added perlite and generally do not lose seedlings of Western American species and hybrids. The losses that occur for me during this transition occur because of several reasons. (1) not checking the baggies and having elongated seedlings that are weakened, (2) rough handling during transition to soil, (3) not watering thoroughly to ensure contact between the root and the soil, (4) overheating and drying up before the root has had a chance to firmly establish in the pot. To prevent that last problem, I don't put the newly transplanted seedlings directly under the heat of the fluorescent lights right away. I wait a day before putting it under the lights. Before that, I place it in the room somewhere near my light setup, but not directly under the light, and not in the path of direct sunlight. Room temperatures of anywhere near 70 F / 21 C are OK, but too warm conditions may be detrimental. If it is fungal disease killing these seedlings, but not harming your other lily species and hybrids, then that is an interesting problem. I am in the Pacific Northwest and of course, my natural environment might have a fungal biome that is more compatible with these species. However, I would consider the above issues first. Gordon PNW near Seattle but in the foothills, zone 7-8 Crocus and snowdrops looking good on warm winter days On Tue, Feb 15, 2022 at 2:51 PM Rick Rodich via pbs < pbs@lists.pacificbulbsociety.net> wrote: > Pasteurizing soil with steam is a good idea, because it is somewhat of a > selective killer. In theory at least, the bad actors are killed, and many > of the good ones are not. Rick Rodich > > > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… > Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>