Horrible spots on dendrobium leaves

[Bethy]

Overnight, these horrible spots appeared on my Dendrobium leaves. What do you think this is?

[estación seca]

Was it an older leaf? Sometimes this happens when they're about to drop off naturally.

[Bethy]

I had three leaves that had the spotting all at once.

[KatieM]

Was it outside? Did it happen to get cold last night? Did you mist or water it yesterday afternoon or evening? Let us know growing conditions and what you've done recently...that might help give some clues. So some of our super awesome senior members can Nancy drew it 🙂

[Bethy]

Thank you for the questions. The dendrobium is grown indoors in a bright room but is not close to the window and was misted in the early afternoon the day before the spotting appeared. 3 leaves were spotted, but the rest are okay.

[estación seca]

This is often what they look like when they drop naturally. What is its name? What are your growing conditions - temperatures, humidity, light? How much are you watering? How do you decide when to water?

[Bethy]

I hope this clarifies the growing conditions:
Temperatures - typical indoor temps 68-75
Humidity - indoor fountain and humidity tray
Light - bright, southeast window
Water - The leaves were misted in the afternoon, and the next day, 3 were spotted and looked sickly.

Maybe the leaves were old. Perhaps the orchid didn't like the afternoon water spritz. At any rate, the orchid now seems to be doing fine—no more leaf damage.

[estación seca]

I'm more and more suspecting old leaves dropping. I don't think it was related to misting. But I would stop spraying the foliage. It doesn't raise humidity to any extent inside typical homes, takes time, and can contribute to fungal problems during spells of high humidity.

I asked the name because there are different kinds of Dens. with different cultural preferences. I'm guessing this is a hybrid in the Den. phalaenopsis group, but it might not be. If you don't have a name, could you show the stems of the plant?

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