Gnat and fruit fly control for Ontario, tied to backyard citrus left over from the colony's original orchards rather than any active quarantine.
Call (844) 924-1337California's produce growing scale comes with a genuinely serious invasive fruit fly problem elsewhere in the state, including active Mediterranean fruit fly quarantines in Bay Area communities as recently as 2024 and 2025, but Ontario isn't in one of those affected zones. What Ontario residents run into instead traces back to a smaller, older source: citrus trees planted generations ago as part of Chaffey's original colony orchards still grow in a lot of the city's established backyards, and fallen or overripe fruit left under them becomes an easy breeding source right next to the house.
Fungus gnats show up from an unrelated habit, overwatering potted plants and patio containers, which creates the same kind of consistently damp soil the region's naturally dry ground wouldn't otherwise support. Both problems usually trace back to one specific tree or planter once someone looks. Call (844) 924-1337 to discuss pest control help in Ontario and check service availability.
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Finding and eliminating the breeding source, whether that's overripe produce, a drain, or the garbage disposal, matters more than swatting the flies you can see. Traps can help reduce the adult population while you address the source, but a recurring problem often means the source hasn't fully been found yet.
Note where the flies gather, including any activity around plant containers, fruit around outdoor trees, and stored produce. Describe whether the problem is limited to one area or appears in several places, and what cleaning or watering changes you have already tried. That record helps focus the search for the source without assuming every small fly is a fruit fly.
Explain which area you cleaned, whether sightings decreased, and where flies appeared again. Mention whether activity stayed near the original spot or shifted elsewhere. Ask whether another breeding source needs checking before repeating the same approach; fewer visible adults alone does not establish that the source has been addressed.
Fruit flies and fungus gnats have different sources, produce and drains for fruit flies, overwatered houseplant soil for gnats, so treating both effectively means identifying which you actually have. Identifying which flies are present helps focus the inspection and treatment on the correct breeding source.
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