I'm not at all sure you are looking at disease issues here. The first three photos are showing signs of mite damage - the stippling or dotting of the foliage is pretty characteristic of that problem and the trumpet vine is clearly showing a mite infestation.

And while pachysandra can develop a number of leaf spots/blights, they don't look much like what's on your plants but perhaps they have yet to fully develop. Pachy can also become infected with alfalfa mosaic virus but that also does not resemble what's on your plants.

And maybe it is just the quality of your photo but I don't see much wrong with the kiwi other than some discoloration.....which could (and probably is) be due to cultural or nutrient issues.

I see. In retrospect, I shouldn't have used the word "disease" as I have no idea what's hurting my plants---pest, disease, cultural or nutrient. Spider mites do make sense for many of my plants. The allegheny spurge spots remain a mystery.

Oh, this is interesting---on the spurge, there's tiny black dots inside the white spots that look like pycnidia (something I just learned about ten minutes ago):

So, seems like some sort of fungus then?