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Thanks to everyone who contributed their thoughts. I just got home from a grip but will get on this right away. Damage doesn't seem to be continuing to spread, but rather has gotten more pronounced on the areas that were infected when I left. I will work on this. Very much appreciate the help.

Thanks. I saw that post but that was caused by water. My leaves rarely get water on them and our humidity is low. I think it's a different malady, though it could be a kind of fungus.

I'm sorry, but I don't know what you mean. Could you explain, please?

Thank you. I will try that.

HELP! My Rothschilde-Phillipinense is in a death spiral! I recently repotted my Paph Roth in fresh medium: the same medium it has been thriving in for years. It soon developed ugly brown spots on its new leaf, which also spread to other leaves. Can anyone tell me what's happening here, and what...

The roots looked fine. And thank you for the suggestion of starting a new thread. I'll try that.

Thank you, that's helpful. I am afraid I gave my plants too many hours of too-bright light last winter (my first) November was 14 hours, Dec 13 hours, Jan 12 hours, then increasing an hour a month until I put them back on the windowsill in March. Our days are very long in summer, and I think...

Hi Trevor. I am trying to solve the lighting puzzle. How many hours of light do you give your Catts in winter and summer?

HELP! My Rothschilde-Phillipinense is in a death spiral! I recently repotted my Paph Roth in fresh medium: the same medium it has been thriving in for years. It soon developed ugly brown spots on its new leaf, which also spread to other leaves. Can anyone tell me what's happening here, and...

This is great. I have that app on my phone and I'll put it to work. Last winter some of my Catts thrived while others seemed to get hammered: there are lighting variances even within the Catt family. All are doing better now that they are in real sunlight.

Thanks to EVERYONE for all that good advice! I've cut down on the light. Is there any way I can apply extra nitrogen other than switching fertilizers? I've read that I should add calcium by adding ground up eggshells, but I don't know if that's for real. I just repotted it, and roots are...

Thanks for this. I'm using an HLG-60, primarily because it was one of the few lights that fit my small square low space, is dimmable, and doesn't generate heat (which I can't easily vent). Please don't laugh at me, but I have an app on my iphone that measures PPFD. Photone - Grow Light Meter...

Not wanting to stir the pot here, but I do use Kelpak! It's hard for me to gauge the effect, as I have not control group, but my orchids generally look pretty good, so there is that!

I'm using Schultz Expert Orchid food, 19-31-17 on a weakly/weekly basis, but less in winter. At one point I mixed in some pulverized eggshells to increase the calcium. I didn't see any visible effect.

That's really helpful. I think I just hammered them with too much light, as I was going with recommended photoperiods of 13 and 14 hours, and the plants were mostly catts. I can see that I have one catt that has been throwing out smaller growths for a while. I just repotted it and hope that...

Thank you! I have wondered if it was the same as St. Swithin. This one says also: " 'Jungle Selected x Atlantis SM/TPS" Should I do anything abut the too-yellow color or just see how it does in a lower light regime? I also have a couple of Catts that got very yellow. Both had naturally...

Not to try anyone's patience, but I have one more question: I have a Maudiae type paph (pictured in my first post) that is ready for repotting. It blooms once every two years and has bloomed twice for me. I believe the plant is about 7 years old. I have been keeping it in fine-grade (small)...

Hi! I have a Paph. Rothschildianum x Philippinense which I have been caring for for about 3 years. I just repotted it. It's a grassy green, almost yellow color and I'm concerned that perhaps it may be missing some nutrients. I'm using Schultz Expert Orchid food, 19-31-17 on a weakly/weekly...

I have only so much control over temperature and humidity, though I may roll out some pebble trays in my tiny grow area. What about spagnum moss vs tiny bark chips? I have tried keiki paste on Phals and Cattleya. It works great on Phals getting them to sprout more spikes from existing...

Thanks! Generally, most of them look healthy but a couple have some of the backbulbs (or, many of the backbulbs) yellowing. It may be because I haven't changed the medium in a couple of years, but I'm not sure. Roots are very healthy and both have new growths. For the light meter, I...