Iowa State University Extension - Wapello County Plum cuculios are pests of peaches, plums, cherries. and apples.
Overwintering adults begin to appear in orchards about the time apples are in the pink stage.
Adult feeding and egg laying are characterized by small crescent-shaped cuts in the skin of small fruits. These injuries may later result in deformed fruit. The larvae usually eat into the flesh of apples to the core and seeds. There is one generation each year in Iowa.