Housekeeping · 실내 식물 관리

Fungus gnats in houseplants: six steps for soil moisture and monitoring

Tiny dark flies around pots may be fungus gnats. Adjust soil moisture, monitor with sticky cards, and know that traps alone do not control larvae.

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Wikimedia Commons · Photo: gailhampshire / Wikimedia Commons, CC BY 2.0 (unmodified). · Creative Commons Attribution 2.0 Generic ↗

University of Minnesota Extension explains that fungus gnats favour moist potting mix and adults are usually more of a nuisance than a major plant threat. Begin by checking watering practices.

Your try-it-at-home checklist

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1. Check that small dark flies are emerging around potting mix; avoid confusing them with fruit flies.
2. Inspect leaf surfaces, pot rims and saucers for other pests, and isolate new plants briefly for monitoring.
3. Allow the soil surface to dry as much as the plant can tolerate between waterings; do not let the plant wilt.
4. Use yellow sticky cards to monitor adults, away from children and pets. Traps alone do not solve a larval infestation.
5. For persistent problems, consider repotting into fresh mix with a clean pot while protecting healthy roots.
6. If considering a larval control such as an approved biological product, follow local registration and its exact label. Do not improvise pesticide mixtures.

University of Minnesota ExtensionManaging insects on indoor plants | University of Minnesota Extension ↗University extension fungus gnats section confirms larvae prefer wet potting mix, dry topsoil without wilting, yellow sticky traps monitor adults but are not enough, clean-pot repotting, and label-based Bti option.Wikimedia CommonsFile:Sciara hemerobioides Black Fungus Gnat photo | Wikimedia Commons ↗Photo by gailhampshire, CC BY 2.0 verified on original file page, source-file URI opened and visually inspected; illustrative reference, not a photographed home infestation.Wikimedia CommonsWikimedia Commons technical reuse and hotlink policy ↗Commons explicitly allows hotlinking with continued file-specific licence and credit compliance.

Your try-it-at-home checklist

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