So sorry, Trevor. I know it can be devastating.
I had to start almost from scratch in the 90's. I sprayed with Benlate a fungicide. Over a summer, I lost cattleyas that had been in my family for years, passed down from my Grandmother. Seems Dupont never cleaned out a tank that had been used to mix a batch of herbicide. Processed the Benlate inside that tank and the rest is history. It was a maddening, slow process of death.