With the peppers the worm (maggot) that is usually called "corn root worm" will enter thru the ★★★★★★★★ between the cap and the fruit. The worm turns into the yellow and black "cucumber beetle".
Early in the season they will kill young just emerged squash plants if not taken care of. I don't know of any organic method so we use Sevin dust. Later in the season they will eat the silks off young corn ears.They usually don't bother the peppers much unless they don't have either of their more preferred crops around.
As far as the eggplant with stripped leaves -- most likely Colorado Potato Beetles and their larva. They like Eggplant even more than potatoes. Good luck killing them. Most are immune to just about everything except squishing.
pics here
http://www.google.com/search?q=color...w=1024&bih=653
Carol