The red plum maggot (Cydia funebrana) is mainly a pest of plums but can also attack apricot and peach. It occurs in Europe and Asia.
Life cycle and appearance of Red plum maggot
The adults of Cydia funebrana have a wingspan of 11-15 mm. The forewings are dull purplish grey, with darker, obscure markings, and irregularly suffused with ash-grey; the hindwings are brownish grey.
Eggs are small, whitish translucent when laid and later becoming yellowish. The larvae are up to 12 mm long, bright pinkish red with a dark brown to black head; young larvae are whitish and translucent. The pupa is light brown and 6-7 mm long.
Adults occur form April to May onwards depending on the location. Eggs are laid on fruitlets from May or June onwards, usually just one per fruitlet. The eggs hatch after about two weeks. The emerging larvae bores into the fruitlet and fed there for several weeks passing through five instars. When fully grown, from late June onwards or in July and August depending on the climate, they leave the fruits and spin a cocoon under loose bark or in other hiding places. In warmer regions, a second generation is produced, whereas in cooler areas they remain in diapause until the next spring. Then they pupate.
The mines produced in the fruit quickly become brownish and the flesh in the area near the stone is eaten and converted into a mass of wet brown frass. Attacked fruit ripen prematurely and fall off. Droplets of dried up gum can be seen at the entry holes.