Do you have repeated attacks of Fusarium? You should disinfect your grow area and treat with a proven product if your plant is valuable to you. One of the few products I know of that works on Fusarium is Banrot. There are others and they are all expensive. You only need a small amount so see if you can split the product with some friends or orchid buddies. One place is
Fungicides which has a variety of products used by professionals and they work. I use them in my gh.