That looks like spider mite damage. Spider mites love thin-leafed plants of all kinds, and are common in warm and low-humidity environments. Some thin-leafed plants are such delicacies they even attack in higher humidity. Spider mites are famous for attacking thin-leafed Dendrobiums like this one.
Take a tissue and rub from the stem to the leaf tip on the underside of the leaves. If you see brownish or red streaks you have spider mites. You need to move fast. They can kill plants in a few days. They will be on all your plants, but damage won't be visible on the more resistant ones.
Spray the entire surface of all your plants with one of two things: 70% isopropyl alcohol (rubbing alcohol), or 1 Tablespoon of liquid dish soap for hand washing dishes in a quart of water (15ml soap in 1 liter water.) Then read more about spider mites here on Orchid Board in the Pests and Diseases forum.
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