White Stripes/Marks On Leaves

[Roberta]

Originally Posted by hodgesml

Thank you to everyone who responded. Definitely no mites so let’s go with sun. Have moved them so they only get dappled sunlight.

Sun especially in early spring can easily burn plants because the sun abruptly clears obstacles (like houses, fences, etc) so that areas that have had shade suddenly get blasted. (Orchids that can handle strong sun once acclimated can still burn if they aren't introduced to it gradually. ) I speak from experience... I have toasted plenty of leaves right around the vernal equinox. The plants recover, no worries there, though leaves look ugly until they drop. If I'm right about the type (Den. kingianum or relative), this one may lose those damaged leaves, but no harm, will readily produce new growth even from leafless pseudobulbs.