I have mostly NOID complex hybrids. I have a bunch that I acquire in the summer and end up keeping outside. When nights start getting into the 40s and days don’t get warmer than the 60s some start getting this type of damage. If I bring them in the house (70s), the progression stops although the affected leaves stay “ugly”.
I have lost a few indoor Phalaenopsis on windowsills and I suspect that even 60s were too low for them so I try to stay away from hybrids with a lot of “hot” growers in their background if I’m buying ID’d plants.
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