Flea beetle damage has been observed on unsprayed blueberry plots at the NCSU Horticultural Crops Research Station in Castle Hayne. Feeding is mostly on new succulent shoots that have emerged following post-harvest summer pruning (hedging), so these are next year's bearing shoots that need to retain their leaves in order to set flower buds for the 2013 crop. Much of the damage is cosmetic, but where shoots are completely defoliated, or the shoots themselves are eaten, yield will be reduced in 2013.
For more information on insect pests of small fruits, see Hannah Burrack's excellent blog
here.