To get rid of bugs on indoor plants, figure out which pest you have, isolate the plant, rinse off as many bugs as you can, and then treat with a method matched to that pest, repeating every 5 to 7 days for 2 to 3 weeks.
Most houseplant pests come back after one spray because eggs and young bugs survive it.
The repeat schedule is what catches them.
The good news is that a handful of tools handle almost every case.
A sink sprayer, 70% rubbing alcohol, insecticidal soap, neem or horticultural oil, yellow sticky traps, and mosquito bits cover the seven pests you’re most likely to meet indoors.
Once you can name the pest, you’ll know which of those tools to pick up first.
Identify the Pest by Where It Lives and the Damage It Leaves
Indoor plant pests are easy to tell apart once you know where each one hides and what kind of damage it leaves behind. Webbing points to mites, cotton fluff points to mealybugs, and tiny flies over wet soil point to gnats. If you are stocking up, a set of yellow sticky traps is the first thing I would pick up.
Where Should You Look First?
Start with the leaf undersides. Spider mites, whiteflies, aphids and scale all like the shaded side of a leaf, so flip several leaves on each plant and look closely.
Next, check these spots:
- New growth and buds: aphids and thrips crowd onto soft, young tissue.
- Leaf joints and stem crevices: mealybugs tuck into the angle where a leaf meets the stem.
- Stems and leaf veins: scale looks like small brown or tan bumps that don’t move.
- The soil surface: fungus gnats lay eggs in the top layer of damp potting mix.
- The pot rim and saucer: sticky residue or crawling insects often collect here.
A cheap 10x hand lens helps a lot. So does tapping a leaf over a sheet of white paper and watching for moving specks.
Which Pest Matches the Signs? An Identification Table
Use this table to match what you see to the pest most likely causing it. If you’re seeing tiny white bugs on plants, the table helps you sort mealybugs from whiteflies, which need different treatments.
| Pest | Where you’ll find it | What it looks like | Damage and clues |
|---|---|---|---|
| Fungus gnats | Soil surface, flying near pots | Tiny dark flies, weak fliers | Adults hover over wet soil; larvae in top 1 to 2 inches |
| Spider mites | Leaf undersides | Specks that move on white paper | Pale stippling, fine webbing, dusty look |
| Mealybugs | Leaf joints, stems, sometimes roots | White, cottony, slow-moving | Sticky honeydew, stunted growth |
| Aphids | New growth, buds, undersides | Pear-shaped; green, black, pink or yellow | Curled leaves, sticky honeydew |
| Scale | Stems, leaf veins | Brown or tan bumps that don’t move | Yellowing, sticky leaves, sooty mold |
| Thrips | New leaves, flowers | Slender, fast-moving, 1 to 2 mm | Silvery streaks, black specks of frass |
| Whiteflies | Leaf undersides | Tiny white moth-like insects | Cloud flies up when leaves are shaken |
For dark-colored flyers and crawlers, my guide to tiny black bugs on indoor plants covers the lookalikes side by side.
Isolate, Rinse, and Prune Before You Spray
Moving the plant away from the others, washing off live bugs, and cutting away the worst growth will remove a big share of the problem before any product touches the leaves. That makes every spray afterward work harder.
How Do You Keep Bugs From Spreading?
Move the infested plant to another room, or at least several feet from your other plants. Mites, aphids, thrips and whiteflies all crawl or drift to neighboring pots, and leaves that touch make it easy.
Then check every plant that was sitting nearby. I’d treat close neighbors as suspects for at least two weeks.
A few habits help:
- Wash your hands and pruners after handling the infested plant.
- Don’t reuse the same rag or sponge on healthy plants.
- Wipe the shelf or windowsill where the plant sat.
- Keep the sick plant isolated until two checks a week apart show no live bugs.
How Can You Remove Pests Without Damaging Leaves?
Rinse the plant in the shower or at the kitchen sink with lukewarm water. Aim at the leaf undersides and stems, and support each leaf with your hand so the spray doesn’t tear it.
Cover the soil with a plastic bag or plastic wrap first so you don’t flood the pot. For small plants with delicate leaves, turn the pot upside down (holding the soil in place) and swish the foliage in a bucket of room-temperature water.
After rinsing, prune leaves or stems that are heavily coated with bugs, webbing or scale. Seal the cuttings in a bag and put them in the trash.
Never compost them, since that just spreads the pests outdoors and back in again. I’d avoid removing more than about a third of the plant at once so it has enough leaves left to recover.
Treat Fungus Gnats in the Soil and Above It
Fungus gnats need a two-part fix: dry out the soil where larvae live, and trap the adults so they stop laying eggs. The adults are just a nuisance, but the larvae chew roots when numbers get high, especially on seedlings and young plants.
Let the Top 1 to 2 Inches of Soil Dry
Fungus gnat larvae live in the top 1 to 2 inches of damp potting mix. Letting that layer dry out between waterings kills eggs and larvae and makes the pot unattractive to egg-laying females.
Push your finger into the soil before you water. If the top 1 to 2 inches still feel moist, wait. Empty any water sitting in saucers or cachepots within 30 minutes of watering.
Bottom watering helps a lot here. Set the pot in a tray of water for 15 to 30 minutes, let the mix soak up moisture from below, then drain it. The surface stays drier, which is where the gnats breed.
Some gardeners sprinkle a thin layer of diatomaceous earth or coarse sand on the dry soil surface. It can discourage egg laying, but diatomaceous earth stops working once it’s wet, so it’s a helper at best.
For more soil-dwelling pests, see my guide to bugs in houseplant soil.
Catch Adults and Treat Larvae With BTI
Yellow sticky traps catch adult gnats and show you how big the problem is. Stick one into the soil of each affected pot, keep it off the leaves, and swap it out when it fills up.
For the larvae, use BTI (Bacillus thuringiensis israelensis), a bacteria sold as mosquito bits. It targets fly larvae and is labeled for use around people and pets.
Soak the bits in your watering water following the label, strain or leave them in, and water as usual so the treated water reaches the root zone.
Keep this up for 3 to 4 weeks. Fungus gnats run through a full life cycle in about that time, so stopping early lets a new batch hatch.
Clear Spider Mites From Leaf Undersides
Spider mites are worth taking seriously because they multiply fast in warm, dry indoor air, and a light case can turn into a webbed, yellowing plant within a few weeks. Crotons, English ivy, palms and elephant ears are frequent targets.
How Can You Confirm Those Specks Are Spider Mites?
Hold a sheet of white paper under a suspect leaf and tap the leaf firmly. If tiny dots fall and start crawling, you have spider mites.
They can be red, green or yellow, and they have eight legs, so they’re relatives of spiders, not true insects.
Other signs include:
- Fine pale speckling (stippling) across the leaf surface
- A dull, dusty look to the foliage
- Thin silky webbing between leaves and stems
Webbing means the population is already well established. My full guide to spider mites on indoor plants has more on hard-hit plants.
Rinse Away Webbing and Repeat Contact Treatments
Start with a strong shower rinse focused on leaf undersides, which knocks off adults and breaks up webbing. Then spray insecticidal soap or horticultural oil so it fully wets the undersides, since these products only kill mites they touch.
UC IPM lists soaps and oils among its low-toxicity options for mites on indoor plants.
Repeat every 5 to 7 days for at least 3 weeks. Mite eggs survive sprays, so each round catches the newly hatched ones.
Raise humidity while you treat. A humidifier or a pebble tray helps, and moving the plant away from heating vents slows mites down.
Remove Mealybugs From Stems and Leaf Joints
Mealybugs look like tiny tufts of white cotton, and you can kill most of them on contact with rubbing alcohol. The hard part is finding the ones hiding in tight spots.