Thanks, bobad. Lots of info at that site; best one I've seen on the subject.

I don't think it's a viral or fungus thing. I suspect it's more like a moisture or heat or nutrient problem. I was avoiding fertizing the plants after they blossomed for just the reason you mentioned above. We had a couple of cooler nights recently so that might be it too.

By the way, here are some pics I took today of the plants in question (notice the curly leaves?):

The Big Berthas, supposed to be red when ripe

The Lady Bells, a green variety.

A Golden Bell, yellow when ripe. You can see a yellowed leaf at the bottom.

Another Golden Bell, with a yellowing blossom on the left, ready to drop off.

Maybe I need to harvest some of the bigger peppers? Not enough plant mojo to go round for the new runts to develop?...