This hosta of unknown origin looked fine two days ago and now I see this:
I've been treating for pests the last few days. This area also gets a lot of late afternoon sun.
Don't see HVX. What have you been using to "treat for pests". Looks a bit like Fortunei Albomarginata.
I treated the hydrangeas just behind this with an anti fungal.
I also spread some diatomaceous earth to deal with slugs. (I've since done a bit more reading and switched to an ammonia solution).
Sorry to be paranoid. I'm new, and I've done a lot of moving plants of unknown origins all around my property prior to learning about HVX with no cleaning of tools in between. If I have one plant with HVX, there is a good possibility that I have 30.
The diatomaceous earth should be harmless. It's simply ground up remains of a marine organism.
It's possible that the brown areas were caused by the fungicide. If it was somehow applied at a concentrated level, it could burn the foliage. Can you get a better straight-on pic and post it for us to look at?