The heuchera damage occurred 7-9/2012 and 2011, possiblly before that. It occurs to me that the past two summers have had drought conditions and very likely in 2013 we will have more. Sorry I don't have pictures. Bugs do like hot dry weather so Sally G 's website offering in the MidAtlantic forum may hold some promise:
Please offer any other thoughts.
Heucheras eaten 2012; Usual suspects don't seem cullprits