catasetum with leaf spots

[shahnw]

My catasetum has recently developed these chlorotic spots. In a few places, there appear to be larger, irregularly shaped black spots, the largest of which is slightly translucent at the center. I have a second catasetum that has also started to display one or two of the small spots. I have thought thrips, spider mites, and cercospora, but I am fairly ignorant in this area and at a loss for what it is and what to do.

[Roberta]

That looks to me like sunburn - Catasetinae need bright light, but a sudden blast of unfiltered sun can still toast leaves.

[shahnw]

Thanks Roberta, that is very helpful. do you have any idea as to what might be causing the small spots? you can see them best in the second image.

[Roberta]

Something may be munching... look at the underside of the leaf and see if perhaps scale. Or it could be just on top. Would not be a bad idea to spray with Bayer's Advanced (or whatever they call it now) - spray both sides of the leaves. It does contain a miticide as well as insecticide (and Catasetinae are spider-mite magnets though that doesn't look like spider-mite damage)

[isurus79]

I'd say Roberta nailed this diagnosis!

[Roberta]

Originally Posted by isurus79

I'd say Roberta nailed this diagnosis!

Thanks!

[shahnw]

It does look like you may be right Roberta. I just took a closer look at the rest of my plants. My Phal and my Peristeria elata look like something has been munching on them as well.