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
uploaded it to my website, so that you can check it out, or download it for yourself.