Pepper problem
 

Maybe someone can shed light on this problem. We're in zone 6a, almost
online with 7a and our garden is thriving this year. That is, everything but
the peppers. I have regular bell and the colored types including a few
pimentos. Of the 18 plants only 3 have a few peppers. The rest are tall and
a nice green but with almost no flowers. Tiny buds just sit there. When
flowers do open, they close in a few days, turn brown to the stem, and the
entire thing falls off. No peppers form. Also, I find it strange that
they're dropping green leaves from the bottom. Every one of them has at
least 2 green leaves they've dropped. They're spread out over 3 garden
plots, not all together. We don't see any insect pests on them. Usually by
mid july I'm awash in peppers and already freezing them for winter. We've
had rain so drought is not a problem this year. Any suggestions? Ideas?
Thoughts? We really miss our peppers.