Fruit Flies
Anastrepha, Ceratitis, and Bactrocera species
A group of true fruit flies whose females lay eggs under the skin of ripening fruit, where the maggots tunnel and feed and turn the flesh into a soft, brown, inedible mush. They are among the most serious fruit pests in the world, attacking hundreds of kinds of tree fruit, and several are under active quarantine and eradication programs in the United States.
🔎 How to spot it
These are not the tiny vinegar or pomace flies that swarm overripe fruit in the kitchen; they are larger, ranging from a little smaller than a housefly to housefly-sized, with patterned or banded wings and bodies marked in brown, yellow, and black. The Mediterranean fruit fly has mottled wings and a yellow body, while Anastrepha species such as the Caribbean fruit fly are larger with a long, pointed egg-laying tube. The maggots are white, legless, and tapered, found tunneling inside the fruit.
🥀 Damage it causes
The female punctures the skin of ripening fruit to lay eggs, leaving a small sting mark that may ooze or dimple, and the hatching maggots tunnel through the flesh. Their feeding, together with the rot organisms that follow them in, breaks the fruit down into a wet brown pulp, and infested fruit often drops early. A single female can ruin many fruit, and one of these flies can attack a wide range of hosts, so infestations spread fast.
🛡️ Prevent it
Pick fruit promptly as it ripens and never let windfalls or overripe fruit sit on the ground, since fallen fruit is the main breeding source. Bag developing fruit on prized trees, and where flies are active hang baited or sticky traps to catch adults and time control. In quarantine areas, do not move homegrown fruit out of the regulated zone, which is how these flies reach new regions.
🧯 If it is already here
Sanitation is the backbone of control: gather and destroy infested and dropped fruit by bagging or deep burial so the maggots cannot complete development. Protein-bait sprays that mix a small amount of insecticide with a feeding attractant, and the naturally derived spinosad, are the usual tools and are applied as spot treatments rather than covering the whole tree. Large outbreaks are handled by agencies with traps, baits, and sterile-insect releases.
💡 Good to know
True fruit flies are tightly regulated because a single mated female arriving in fresh fruit can found a damaging population, which is why fruit is inspected at borders and why quarantines restrict moving homegrown fruit. If you find white maggots inside otherwise sound-looking fruit, report it to your local agricultural office. Removing every dropped and overripe fruit is the most powerful thing a home grower can do.
🌱 Plants it attacks
20 plants in the library can be attacked by this pest
For educational and informational purposes only. Pest control advice is general guidance drawn from university cooperative extension sources; always identify a pest positively and read and follow the label on any product before use, especially around food crops, children, and pets.