Fruit Fly (Mediterranean)

The Mediterranean fruit fly, or medfly, Ceratitis capitata, is a small tephritid fly native to sub-Saharan Africa that has become established across much of the Mediterranean basin, parts of the Americas, Australia, and other warm regions through accidental transport in fruit shipments. Adults are noticeably more colorful than a typical house fly, with a body marked in black, yellow, and silvery-white and wings patterned with bold brown bands and streaks.

Female medflies use a sharp, retractable egg-laying organ to insert eggs just beneath the skin of ripening or nearly ripe fruit, and the developing larvae tunnel through the flesh as they feed, a habit that has made the species a well-studied agricultural pest of citrus, stone fruit, and many other crops in regions where it has become established. Because of its economic significance, the medfly has also become one of the most intensively researched fruit flies in applied entomology, particularly for detection trapping and area-wide management programs.

Outside of agricultural contexts, the species is simply one of hundreds of tephritid fruit flies worldwide that specialize on fleshy fruit as larval habitat, an ecological role shared by many native, non-pest species in the same family.

• Small fly, about 4–5 mm long, with a tan to black body marked with pale yellow patches and rows of fine silvery hairs on the thorax
• Wings are broad, clear, and marked with distinctive brown and yellow bands and streaks arranged in a mottled pattern
• At rest, wings are held out and slightly down, often waved slowly from side to side, a behavior typical of tephritid fruit flies
• Females have a slender, pointed ovipositor visible at the tip of the abdomen, used to pierce fruit skin
• Distinguished from the common vinegar fly (Drosophila) by its larger size, patterned wings, and lack of red eyes

The Mediterranean fruit fly is found in warm temperate to subtropical climates worldwide, wherever host fruit trees grow and winters remain mild enough to support year-round activity. It is closely associated with orchards, home gardens, and areas where cultivated or ornamental fruit trees are present, and adults are most abundant during the fruit ripening season in a given region. In climates with cold winters the species generally cannot persist outdoors, limiting its established range to milder regions.

Adult medflies feed on plant sap, nectar, and other sugary substances, while females seek out ripening fruit to insert eggs beneath the skin using their pointed ovipositor. Males gather on leaves within a host tree to perform courtship displays involving wing movements and pheromone release, attracting females to mate before egg-laying begins. Within its introduced range the species is recognized as a significant pest of many fruit crops, since larval feeding causes fruit to rot and drop prematurely, though in its native African range it exists alongside a wide diversity of other fruit-feeding tephritids as part of the natural fruit-fly community.

Eggs are laid in small batches just under the skin of host fruit and hatch within a few days, after which larvae tunnel through the fruit flesh, feeding and molting through three stages over one to two weeks depending on temperature. Mature larvae exit the fruit, often after it has fallen, and burrow into the soil to pupate for one to two weeks. Adults emerge, mature over several days, and begin the cycle again, with warm climates supporting many overlapping generations throughout the year.