What are the most common houseplant pests?

The pests found most often indoors are spider mites, mealybugs, scale insects, thrips, aphids, whitefly and fungus gnats. Mealybugs, spider mites and fungus gnats are the ones most home growers meet first.

How do I get rid of bugs on my indoor plants naturally?

Start by isolating the plant, then shower it to knock pests off, and wipe leaves with a cloth. Follow up with insecticidal soap or horticultural oil labelled for houseplants, repeated every five to seven days for at least three weeks so you catch each new hatch.

What do spider mites look like on houseplants?

Spider mites are tiny, about half a millimetre, and look like moving specks of dust under the leaves. You usually notice the damage first, which is fine pale speckling on the upper leaf surface and, in heavy infestations, thin webbing between leaves and stems.

Does rubbing alcohol kill houseplant pests?

Isopropyl alcohol at 70 percent on a cotton swab kills mealybugs and young scale on contact and is a good spot treatment. Test it on one leaf first, because some thin-leaved plants are damaged by it, and don't spray it over the whole plant.

Can pests spread between houseplants?

Yes. Spider mites, thrips, mealybugs and whitefly all move between plants that touch or sit close together, and on hands and tools. Isolate any infested plant and check its neighbours carefully.

Is neem oil safe for houseplants?

Neem oil products labelled for indoor plants are widely used against soft-bodied pests and are fairly gentle. Apply them out of direct sun, test on a leaf first, and expect to repeat the treatment. Follow the label for dilution.

Houseplant Pests: Identify and Treat the 8 Common Ones

Houseplant pests are much easier to beat when you catch them early and know which one you're dealing with. The eight you're most likely to meet are spider mites, mealybugs, scale, thrips, aphids, whitefly, fungus gnats and root mealybugs. Most respond to the same plan: isolate the plant, physically remove as many pests as you can, then treat with insecticidal soap, horticultural oil or a targeted product every five to seven days for three to four weeks.

The reason for repeat treatments is that sprays rarely kill eggs. You have to keep going until every generation has hatched and been dealt with. Stopping after one treatment is the most common reason pests come back.

Houseplant pest identification table

Pest	What it looks like	Where to look	Damage you notice	Plants often hit
Spider mites	Tiny moving dots; fine webbing	Leaf undersides, leaf joints	Pale speckling, dull leaves, webs	Calathea, palms, alocasia, ivy
Mealybugs	White cottony blobs	Leaf joints, stem crevices, under leaves	Sticky leaves, stunted growth	Succulents, hoya, jade, monstera
Scale	Brown or tan bumps that don't move	Stems, leaf midribs	Sticky honeydew, yellowing	Ficus, citrus, fern, orchid
Thrips	Slim, 1–2 mm, pale or black insects	Upper leaf surfaces, new growth	Silvery streaks, black dots, distorted leaves	Monstera, philodendron, pothos
Aphids	Soft, pear-shaped, green or black	Tips of new growth, buds	Curled new leaves, sticky residue	Herbs, flowering plants
Whitefly	Tiny white moths that fly up when disturbed	Leaf undersides	Yellowing, honeydew	Hibiscus, herbs, flowering plants
Fungus gnats	Small dark flies around the soil	Soil surface, windows	Mostly a nuisance; root damage in seedlings	Any plant in wet soil
Root mealybugs	White fluff on roots	Roots, inside pot	Slow decline with no obvious cause	Succulents, cacti

The general treatment plan

Whatever the pest, this order works:

Isolate the plant in another room, away from other plants.
Prune the worst leaves and stems and bag them.
Rinse the plant in the shower with lukewarm water, covering the soil with a plastic bag. Hit the leaf undersides.
Wipe leaves with a damp cloth, or a cloth dipped in mild soapy water.
Treat with a product suited to the pest (see below), coating every surface.
Repeat every five to seven days for at least three to four weeks.
Check neighbouring plants, and keep checking the treated plant for two weeks after it looks clean.

The UC Statewide IPM Program points out that many soft-bodied houseplant pests can be managed largely by washing them off with water, which is a good reason to start there before buying anything.

Spider mites

Spider mites thrive in warm, dry air, which is why they show up in winter when heating is on. Hold a sheet of white paper under a leaf and tap it: specks that start moving are mites.

Treat: shower the plant thoroughly, then spray with insecticidal soap or horticultural oil every five days for three weeks.
Prevent: keep humidity up, wipe leaves monthly, and check calatheas, palms and alocasias often.
For bad infestations: predatory mites (Phytoseiulus persimilis) are available by mail and work well on large collections.

Mealybugs

Mealybugs hide in tight spots and protect themselves with a waxy coat, so sprays often miss them.

Treat: dab each one with a cotton swab dipped in 70% isopropyl alcohol. Then spray with insecticidal soap or oil, paying attention to leaf joints. Repeat weekly.
Check the roots: if a plant keeps declining, unpot it. Root mealybugs look like white fluff on the roots and need the roots rinsed and the plant repotted in fresh mix.
Prevent: quarantine new succulents and hoyas for two weeks.

Scale insects

Scale look like small shells or bumps stuck to stems. Adults are protected by their shell, so the crawlers that hatch are the stage most treatments kill.

Treat: scrape off adults with a fingernail or soft toothbrush, then wipe with alcohol. Spray horticultural oil to smother remaining scale and crawlers, repeated every one to two weeks.
Look for: sticky leaves and black sooty mould on the honeydew they drip.

Thrips

Thrips are fast, slender insects that rasp the surface of leaves. They leave silvery patches peppered with black specks (their droppings).

Treat: shower the plant, then use insecticidal soap or spinosad-based products labelled for houseplants, every five days for at least three weeks. Blue sticky traps catch adults.
Note: thrips pupate in the soil, so replacing the top layer of soil helps break the cycle.

Aphids

Aphids cluster on soft new growth and buds.

Treat: squash or wipe them off, rinse the plant, and spray with insecticidal soap. They're among the easiest pests to clear.

Whitefly

Whitefly rise in a cloud when you brush the plant.

Treat: yellow sticky traps for adults, and insecticidal soap or oil on leaf undersides every five days. Vacuuming adults off with a handheld vacuum early in the morning, when they're sluggish, also helps.

Fungus gnats

Fungus gnats breed in wet soil and are dealt with by changing how you water rather than spraying leaves. We cover the full plan in how to get rid of fungus gnats.

Treatments compared

Treatment	Works on	How it works	Notes
Shower/rinse	Mites, aphids, mealybugs, thrips	Physically removes pests	Free, safe, first step
Insecticidal soap	Soft-bodied pests	Breaks down outer layer on contact	Must hit the pest; repeat
Horticultural oil / neem	Soft-bodied pests, scale crawlers	Smothers	Test first; avoid hot sun
70% isopropyl alcohol swab	Mealybugs, scale	Kills on contact	Spot treatment only
Sticky traps (yellow/blue)	Flying adults	Traps	Monitoring as well as control
BTI	Fungus gnat larvae	Biological larvicide	Soil drench
Predatory mites, nematodes	Mites, thrips, gnats	Biological control	Good for big collections
Systemic insecticides	Many pests	Taken up by plant	Use only labelled products and follow the label

Always read the label and use products specifically approved for indoor houseplants where you live.

How to prevent houseplant pests

Quarantine new plants for two weeks before they join the others.
Inspect leaf undersides and stem joints every time you water.
Clean leaves monthly; dust and dry air favour mites.
Avoid overwatering, which brings gnats and weakens roots. Our overwatered plant signs guide helps.
Don't overfeed. Soft, lush growth attracts aphids. The fertilizer dilution calculator keeps feeds light.
Check plants coming back indoors after summer outdoors.

When to give up on a plant

Sometimes the kinder choice is to bin a badly infested plant before it spreads pests to the rest. Consider it if more than half the leaves are damaged, if you've treated for six weeks without improvement, or if the plant is cheap and easy to replace. You can often rescue a clean cutting first: see how to propagate houseplants.

Pest check checklist

Look under leaves and in leaf joints when watering
Tap leaves over white paper monthly to check for mites
Wipe leaves monthly
Quarantine new plants for two weeks
Treat every 5–7 days for 3–4 weeks once you find pests
Check neighbouring plants

Sources and further reading

UC Statewide IPM Program: Houseplant problems, for identification and low-toxicity controls.
Royal Horticultural Society: Glasshouse red spider mite, for mite biology and biological control.
Royal Horticultural Society: Mealybugs, for identification and treatment.
University of Wisconsin–Madison Extension: Houseplant care, for general pest management.

Leaves looking wrong but no bugs? Try our plant leaf problems guide.