brown spots on coelogyne

[missann]

Personally, I would test a buch of things on one leaf. Get a sharpie marker and draw circles around a few spots and then test one spot with physan, another with cinnamon, and another with sulphur. That is what I would try personally. Also this way, you can test to see whether or not any particular substance hurts the plant. I know you probably have already done this, but if not, increase the air circulation. If you are damping down at all, I would reccommend stopping that. It almost looks like you have left water droplets on the leaves in the sun and the spots where the water was has burned. Of course, I cannot say for sure. If you want to do a rudimentary test for virus, you can take some leaf ooze and infect a sweet pea. Apparently viruses from orchids can be transfered to other plants, and I guess sweet peas are what "they" use when doing tests. I hope that helps you.

[addictedcountryman]

Originally Posted by missann

It almost looks like you have left water droplets on the leaves in the sun and the spots where the water was has burned.

I agree because that is what happened to mine. Mine were fine until I misted them last week. I guess thin leaved orchids are susceptible to spotting, which I didn't realize because I have some hard leaved dendrobs and cattleya. Live and learn.