Dusty white residue on Cymbidium foliage

[MrHappyRotter]

I think the important information has already been relayed, all good answers.

If you decide to go with the cinnamon oil / extract option, which works in my experience, I have a word of caution.

I'm pretty sure it's safe to use on cymbidiums, but test a small patch first, and if there's no leaf damage after a day or so, you're good to go. But be careful spraying it on other plants.

I'm saying this with the voice of experience, not all plants can handle cinnamon spray. I know that many Tillansias (bromeliads) and Mimosas, as well as other soft leaved plants will burn very easily, even from a light over spray.

I found this out the hard way. Cinnamon works, and works well, but you need to be selective with it.