The folks at Michigan State Agricultural Extension Service have published a one-page guide to current commercial pesticides. It is targeting greenhouse-grown leafy greens, herbs, and vegetables, but does include those labeled for ornamentals, as well. While not covering all insects and mites, it does provide a decent reference for aphids, fungus gnats, spider mites, thrips, and whitefly, which are pretty common orchid pests.
I have [url="http://firstrays.com/PDF/Insecticides-veg-and-herbs.pdf"]uploaded it to my website[/url], so that you can check it out, or download it for yourself.
Ray Barkalow, Orchid Iconoclast
Using science & logic to improve orchid growing