Moth species that attack Sarracenia:
"The three species of moths in the genus Exyra eats the pitcher tissue, causing the top of the pitcher to topple over. Exyra rolandiana feasts only upon S. purpurea, Exyra ridingsii eats S. flava, and Exyra semicrocea infests the other species. "
"The larvae of the moth Papaipema appasionata bores into the rhizome and causes great damage to the plant. I have also seen a great deal of damage to the fruit of Sarracenia purpurea in New Jersey, apparently caused by the larvae of the moth Endothenia daeckeana." (emphasis mine)
Photos of the the Exyra nigrocaput adult and larva can be seen here. (Barry are there four species of Exra that munch Sarracenia?)
You can induce growing points on Sarracenia rhizomes by cutting notches on the top, maybe the chewed portions have the same effect.