Adult fungus gnats often become noticeable when moist potting mix is disturbed or watered. Their larvae develop in damp organic material, so consistently wet soil can support repeated generations.
Check moisture before watering
Use a finger or clean wooden skewer to assess the upper potting mix. Water according to the plant’s needs rather than a fixed daily schedule, and do not let the pot sit in standing drainage water.
Understand the two life stages
Yellow sticky cards catch some flying adults but do not directly eliminate larvae in the soil. Healthy mature plants may tolerate a few gnats, while heavy infestations deserve more attention.
Reduce breeding conditions
Improve airflow, clean dead leaves from pots and correct drainage. Avoid drying moisture-loving plants beyond their tolerance simply to fight the insects.
Frequently asked questions
Are fungus gnats the same as fruit flies?
No. Fungus gnats are generally slender and associated with soil, while fruit flies favor fermenting food.
Related: how to get rid of gnats in kitchen.
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