Acrobasis vaccinii
Acrobasis vaccinii, the cranberry fruitworm, is a moth of the family Pyralidae described by Charles Valentine Riley in 1884. It is found in North America from Nova Scotia to Florida and from Wisconsin to Texas, it is introduced in the state of Washington.
The wingspan is 16–18 mm.
The larvae feed on Vaccinium corymbosum, Vaccinium macrocarpon, Vaccinium vitis-idaea and Vaccinium stamineum. Larvae feed inside a berry until most of its contents have been consumed. Larvae are mostly green, with some brownish-red pigmentation on the dorsal surface, and grow to about half an inch before pupation. Full-grown larvae over winter in a cocoon, and emerge as adults after full bloom and fruit set. Female moths lay their eggs on the fruit, usually on or within the calyx cup of unripe berries. One generation emerges each year, with each larvae feeding on as many as eight berries to complete its development.()
