[MikeK]

The moth itself actually does no damage. The larvae are the eaters of wool and fur, both a protein substance. A female moth can lay upwards of 1,000 eggs not much larger than a speck of dust. The fact that she flew away does not alleviate the problem. Of course, you won't get 1,000 holes if you do nothing to kill the larvae and eggs, you may only get 50 or a hundred.

The eggs can lay dormant from a month to two years if there is insufficient moisture. You need to kill the eggs. Most spray pesticides will kill the larvae that create the damage, but by that time you are chasing a problem already in progress. The pesticides (including 'mothballs') do nothing to dormant eggs. To kill the eggs you need to heat everything to 65C (150F). That will denature critical enzymes within the egg. Start by vacuuming first in all crevices and the underside of cushions, as 90% of the eggs will be picked up that way. A really hot commercial fabric steamer will kill any remaining eggs. You need to get the heat deep into the under-padding, as some of the eggs may have worked their way down through the fabric pores.