Larvae move from one berry to another, injuring 3-6 berries. The larvae web together infested and uninfested berries, which are unsuitable for harvest. Most larvae are grown by the end of May. Larvae drop to the ground and build a silken chamber. Larvae resemble cranberry fruitworms, but are more reddish in color. Larvae reach about 9 mm.
Adults are small dark grey moths with chocolate colored markings on wings.
Wingspan is 8-11 mm, seldom seen, nocturnal. Adults emerge in April, oviposit on fruit and foliage of blueberry. When larvae are half grown, they move into an adjacent berry at the point of contact, lining junction with silk. Some reach full size in this fruit, others enter additional fruit. Murray et al.