Cherry Fruit Fly
Rhagoletis species
The maggots of these small flies are the classic worm in the cherry. A single generation each summer lays eggs just under the skin of ripening sweet and tart cherries, and the larvae feed inside, contaminating the fruit and making it unfit to eat. Even a few flies can infest most of a backyard crop.
🔎 How to spot it
Adults are a bit smaller than a house fly, with a yellowish-brown head and legs, a dark body with pale crossbands on the abdomen, and clear wings marked with distinctive dark bands. The larvae are cream-colored, legless maggots with no obvious head that tunnel in the fruit pulp. Infested cherries develop dark, sunken, soft spots and look shriveled or wilted around the larval feeding.
🥀 Damage it causes
Females lay eggs into the fruit as it colors up, and the maggots feed in the pulp and contaminate it with their waste, so infested cherries are unacceptable for eating and may rot or drop early. Because the damage is hidden inside the fruit until harvest, an untreated tree can have a large share of the crop wormy.
🛡️ Prevent it
Sanitation is the foundation: pick up and destroy all dropped and leftover fruit so larvae cannot complete development and overwinter in the soil below the tree. A weed barrier, ground cover, or mulch under the canopy can interrupt the pupae in the soil. Fine netting over a small tree, put on before the fruit colors, physically keeps egg-laying females off.
🧯 If it is already here
Hang yellow sticky traps baited with an ammonium lure to detect the first adults, then time control to the flight, since sprays must target the adults before they lay eggs in the fruit. On a small tree, netting and strict sanitation may be enough. Where a spray is used, repeat coverage through the egg-laying window from the first catch until harvest.
💡 Good to know
The presence of even a few adults usually means treatment is warranted, because once eggs are laid inside the fruit nothing can be done. Trapping to know when the flies are active, combined with cleaning up every dropped cherry, is the most effective backyard strategy.
🌱 Plants it attacks
10 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.