The more I look at the first photo, the more I think it is Phyllosticta (given the unfortunate name "Thai crud" by some growers). Check the following for information on this disease:
http://www.staugorchidsociety.org/PD...t-ThaiCrud.pdf
Generally, you should not let the leaves stay wet. Humid air yes, spraying roots yes, but minimize the water on the leaves. In addition to the fungicide, make sure you are providing all your plants with some supplemental calcium, which is beneficial and seems to help ward off some diseases.
Another good resource for learning about which fungicides treat specific diseases:
http://www.staugorchidsociety.org/PD...ySueBottom.pdf Not all fungicides treat all problems.
And this link for information on diseases in general:
Orchid Diseases
The St. Augustine Orchid Society's website is a good one to bookmark. Lots of good information.
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