Unsettling leaf spots on many orchids.

[BrassavolaStars]

Hello all,

These unwholesome spots have been appearing on the leaves of several of my plants. None of these plants have had tools shared between them (many have never even been repot ever) and these plants aren’t even near each other in the greenhouse.

What is going on? I virus tested the plant in the last picture and nothing showed up. Not even a ghost of a line. That said, I can’t say whether or not all the spots are caused by the same problem. The first two sets of spots seem possibly different than the rest.

As usual the plants are in greenhouse conditions that can get very warm. Because I’ve been having heating problems, the ventilation hasn’t been great either.

I have also had some pest problems in the form of two spot mites and boisduval scale but none of these plants seemed to have been pest targets.

The first two plants are especially unsettling. Also, it seems like it might be spreading.