Fusarium in Vanda

[estación seca]

I still think the plant's problems are better explained by cool growing conditions and low humidity. Vandas drop leaves when it's too cool and too arid. Your plant doesn't look infected. If you're a student, perhaps the biology or agriculture department at your school could help identify a potential pest. Realise there are Fusarium species that are not pathogenic, but are normal endosymbionts in some orchids.

[Longroots]

It had lost 4 leaves yellowing from the base. I decided not to risk it and throw it away. But I wanted to see so I cut into the Vanda stem. It was pure purple. There was no evidence of any greenery.

I've posted the image of the inside of the stem