The plum curculio, Conotrachelus nenuphar (Herbst), is a weevil (a type of beetle). It is dark brown, 1/4 inch long, and has four humps on its back and a long (one-third of the body length) snout projecting forward and downward from its head.
Found throughout the eastern United States wherever wild blueberries grow, the cranberry fruitworm, Acrobasis vaccinii (Riley), affects cultivated blueberries that are poorly maintained.
The cherry fruitworm, Grapholita packardi (Zeller), overwinters as large larvae in cavities usually made in the dead wood on the bush. The small, dark-gray moths with brown banded wings emerge in the late spring.
The blueberry maggot, Rhagoletis mendax (Curran), is the major pest of blueberries in many parts of the Northeast; however, blueberry plantings in Pennsylvania have not been heavily attacked to date.
These insects may be common in blueberry plantings, especially if pruning has been neglected for several years and the scales' parasites and predators have been destroyed by insecticide sprays.