disease killing my gesneriads
I had been growing various gesneriads for years. About 3 years ago, my few gloxinias, began to die. There leaves looked like they were a little sunburned, the plants became stunted, then died. My African violets began to die also. (it looked like root rot.) When I tried to start new plants, the leaves would not root. My columneas' leaves began to died also, and I lost a few plants. Finally my achimenes are stunted. Some of them have had the same sunburnt look to the leaves. My one strep is hanging on, but no blossoms for 2 years and the leaves tend to die
Any ideas? I use new soil and I believe I clean the pots out well.