Yellow spots of phalenopsis leaves

[Jbombs]

Does anyone know what these yellow spots are and what to use for it? Yellow spots with a tiny brown spot in the middle. Looks like spots started on the underside of the leaf. We are getting a lot of rain right now and they are probably not drying out enough in between. I've been looking online and my best guess at this point is cercospora fungus. Any help is appreciated! Thanks

[estación seca]

Welcome to the Orchid Board!

The most likely causes are necrotic zones around areas where insects took bites, and some kind of fungus due to your recent high humidity.

Phals in nature grow hanging sideways so rain drains out of the crown and down the leaves. Consider potting and/or mounting them like this. I think Orlando is too far North to mount on trees outside, but people in the Miami region are able to do this.

Fungicide won't help for long. I suggest figuring out how to improve leaf drainage and air circulation.

The medium for the Dendrobium looks very old. When was it last repotted? This plant might do well mounted on the branch of a deciduous tree outside, if you can ensure it doesn't suffer frost damage.

[Jbombs]

Thanks for the info. My intention is to mount them on some hanging driftwood that I can move into the greenhouse in winter. They've been a little neglected due to a family health issue, but I'm going to move them out of the rain tomorrow and work on them. What do you suggest for treatment right now? A fungicide or pesticide? Any particular brand? Thanks!!!

[estación seca]

I don't grow in such a high humidity environment so I don't know what happens in Orlando. I don't use fungicides.