Help - Indentify White/ black powdery lesions- Fusarium?

[jesstnt3]

I am a relatively new orchid hobbyist. I have been successfully keeping Phaelenopsis and dendrobium for several years. This year I added a Vanda. (Blue Pacha)
It is growing well making new leaves and now a new flower spike- there is phenomenal root growth since I got it in March.
The lower leaves are wilting- no really discolored and not wrinkling, but are sagging down.
I soak it once a day for 10 -15 minutes and hang it back up to dry. Alternate one week with fertilizer and the next week water only. I have forgotten it in the soak bucket a couple of times so it has had 12+ hours in there at least 3 times in the past 5 months.
I can't tell if this is Fusarium and I am too inexperienced to brave whacking off the ends right now...
Please help a newbie!