Oncidium diseased leaves

[Fredmax]

Hi, I bought a greenhouse last summer and got a bit carried away with the humidity and misting systems, as a result all my Oncidiums now have a fungus affliction.

I know not to hand water their leaves but didn't extend that to automated irrigation and have learnt a lesson.

Would someone be familiar with specifics on what I've managed to infect them with, and what the best treatment is, I've tried cutting off the leafs with cinnamon applied but wondering if a copper anti-fungal, systemic or mancozeb should be my next step as it doesn't seem to have stopped and don't want to lose the plants.

I have also since stopped watering them besides by hand and relocated them outside to get fresh air but Winter's here in Sth Aus and nights are around 7c/45f so may exacerbate the issue.

Thanks

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