I've been propagating African Violets for some time. I've noticed that when potting leaves that sometimes 100% make it just fine and other times I can lose over 50% to rot. Usually a part of the leaf starts to rot, rather than the petiole, but sometimes the petiole may start the problem.
I'd like to know a couple things. First, exactly what pathogens are usually responsible for this type of rot?
Second, where do these pathogens reside - I guess I really want to know what I can do to avoid them.
Thank you.