Pests can turn a thriving plant into a drooping mess in weeks. The key is catching them early — and knowing what you're dealing with. Here's how to identify and eliminate the five most common houseplant pests.
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Spider mites are tiny — almost invisible — but the damage they leave behind is unmistakable. Look for fine webbing between leaves and tiny yellow or white speckles on leaf surfaces. They're most common in dry, warm conditions.
Treatment: Isolate the plant immediately. Wipe down all leaves with a damp cloth, then spray with neem oil or insecticidal soap. Repeat every 3-5 days for two weeks. Increase humidity around the plant while treating.
Mealybugs
These look like tiny balls of cotton fluff tucked into leaf joints and along stems. They leave behind sticky honeydew and cause leaves to yellow and distort. They're slower-moving than other pests and often appear in clusters.
For a step-by-step treatment and recheck routine, see Mealybugs on Houseplants: Find, Treat, and Recheck.
Treatment: Dab each bug with a Q-tip dipped in rubbing alcohol. Follow up with neem oil spray. For severe infestations, you may need to dispose of heavily affected leaves or branches.
Fungus Gnats
Those tiny flies buzzing around your plants aren't just annoying — their larvae feed on plant roots. You'll see them hovering near moist soil. The adults don't damage plants, but the larvae do, especially to seedlings and cuttings.
Treatment: Let soil dry out completely between waterings — fungus gnats need moisture to breed. Set up sticky traps to catch adults. For severe cases, drench the soil with a diluted hydrogen peroxide solution.
Aphids
Aphids cluster on new growth and undersides of leaves. They come in green, black, brown, and pink. They suck sap and excrete honeydew, which leads to sooty mold. Growth becomes stunted and leaves curl.
Treatment: Spray plants vigorously with water to knock them off, then apply insecticidal soap. Neem oil also works. Repeat every week until they're gone. Keep new plants quarantined before bringing them indoors.
Scale Insects
Scale looks like small brown or tan bumps on stems and leaf surfaces. They're stationary and hard to spot because they blend in with plant tissue. Heavy infestations look like a crusty coating on stems.
Treatment: Scrape them off with a fingernail or soft toothbrush. Wipe with rubbing alcohol, then spray with neem oil. For heavy infestations, you may need to prune affected branches entirely.
Prevention Is Better Than Cure
- Quarantine new plants for at least two weeks before putting them near your other plants.
- Inspect plants before buying — check undersides of leaves and stem joints.
- Keep leaves clean — wipe them down periodically to remove dust and potential pest eggs.
- Don't overwater — stressed plants are more susceptible to pests.
Not sure what pest you're dealing with? Snap a photo and let our AI plant identifier take a look. Early detection makes all the difference.
See also: Found small bumps under the leaves? Bumps Under Plant Leaves: Edema, Scale, or Spores? tells scale insects apart from edema and fern spores.