With over 1000 tropical plants, Stewart, pretty much the last thing on my mind is a disease epidemic. I have enough on my table simply watering and fertilizing. I typically have around a dozen cuttings per 5 gal. bucket and in the years of rooting cuttings, I have never seen a "disease" spread one plant to another. Typically, when a cutting rots (usually due to my letting water get to it), it just rots singly. If there is enough length, I just cut back to healthy tissue, let it callus well, and start that plant's rooting process over. I have never really thought about the fact that there is a specific organism(s) involved in that rotting process. Again, that/those organism doesn't seem to jump around. I guess it is naturally present in each and every plumeria, since the perlite is supposed to be sterile.
