You might have potato beetles. They usually go for my potatoes,
occasionally my eggplants if we get a cold spring. For some reason,
they always leave my peppers and tomatoes alone. Maybe that's dessert
-- I usually pick them off around first course.

http://www.uky.edu/Agriculture/Entom.../veg/ef312.htm
http://res2.agr.ca/fredericton/stud/3500/biocpb_e.htm