How to Identify and Get Rid of Common Houseplant Pests

Most indoor plant pests fall into a small handful of categories, and each one has a distinctive appearance and feeding pattern. Correctly identifying which pest you're dealing with matters, since the treatment that works for one often does nothing for another.

Spider Mites

Fine, silky webbing across leaves and stems, paired with tiny pale or reddish specks too small to make out individually, are the giveaway. Affected leaves develop a dusty, stippled, washed-out appearance. Spider mites thrive specifically in dry indoor air, which is why they're most common during winter heating season. Raise humidity, rinse the plant thoroughly under running water, and follow up with insecticidal soap or neem oil applied to both sides of the leaves.

Mealybugs

Small, white, cottony masses clustered in leaf joints, along stems, and at the base of leaves. They're slow-moving and easy to spot once you know what to look for. Dab them directly with a cotton swab dipped in rubbing alcohol, which dissolves their waxy coating on contact, and repeat every few days until no new ones appear — a single treatment rarely clears an infestation completely.

Scale Insects

Small, immobile, shell-like brown or tan bumps along stems and the undersides of leaves, often mistaken at first for a natural part of the plant. Scale insects feed by piercing the plant and sucking sap, and heavy infestations leave a sticky residue (honeydew) behind. Scrape them off with a fingernail or soft brush, then treat with horticultural oil, which smothers any remaining nymphs.

Fungus Gnats

Small, dark flies hovering near the soil surface or around the plant when disturbed. Unlike the pests above, adult fungus gnats do little direct damage to the plant — the real problem is their larvae, which live in consistently moist soil and feed on organic matter and fine roots. Letting the top inch of soil dry out between waterings, and using sticky traps to catch adults, breaks the breeding cycle.

Aphids

Small, soft-bodied insects — green, black, or pink — clustered on new growth and flower buds, where the tissue is softest. Like scale and mealybugs, they excrete honeydew, which can attract ants and encourage sooty mould. A firm spray of water knocks most aphids off; persistent infestations respond well to insecticidal soap.

Thrips

Tiny, slender insects that leave silvery streaks or stippling on leaves and can distort new growth as they feed. They're harder to spot than most other common pests and often confirmed only once the damage pattern is already visible. Neem oil and yellow or blue sticky traps are the standard treatment.

Quarantine New Plants

The single most effective way to avoid a pest outbreak is prevention: keep any newly purchased plant separate from your existing collection for one to two weeks and inspect it closely before introducing it, since pests frequently arrive hidden in nursery soil or tucked into new growth.