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Houseplant Pests: Identification Guide (What You See and What It Means)

Identify bugs on indoor plants by what you actually see: webbing, white fluff, brown bumps, sticky leaves, silver streaks, twisted new growth or tiny bugs in the soil. Match the sign to the pest, confirm it, and know how urgent it is.

Potting Corner Team · Oct 1, 2026 · Updated Oct 1, 2026 · 12 min read

Houseplant Pests: Identification Guide (What You See and What It Means)

Short answer: most houseplant pests can be identified by one clear sign. Fine webbing and pale speckles mean spider mites, white cottony clumps in leaf joints mean mealybugs, immobile brown bumps along stems and veins mean scale, silvery streaks with black dots mean thrips, and small dark flies around the soil mean fungus gnats. Tiny white bugs that jump on wet soil are usually springtails, which are harmless. Start with the table below, then confirm with the quick check listed for each pest before you treat anything.

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For problems that aren't caused by pests, see Houseplant Troubleshooting: Common Problems and Fixes.

The Direct Answer: Houseplant Pests at a Glance

What you seeLikely pestWhere it hides
Fine silky webbing, tiny pale speckles, dusty lookSpider mitesLeaf undersides, shoot tips
White cottony or fluffy clumpsMealybugsLeaf joints, leaf sheaths, undersides
Small brown, tan or white bumps that don't moveScale insectsAlong stems and leaf veins, mostly undersides
Silvery or bronze streaks with tiny black dotsThripsLeaf surfaces, inside flowers
Clusters of small soft green, black or pink insectsAphidsShoot tips, buds, leaf undersides
Tiny white "moths" that fly up when you move the plantWhitefliesLeaf undersides
Small dark flies walking on the soil or around the potFungus gnatsTop layer of wet potting mix
Twisted, cupped, stunted new growth but nothing visibleBroad or cyclamen mitesInside buds and unopened leaves
Plant declining, nothing on leaves, white wax on rootsRoot mealybugsOuter root ball, pot wall, drainage holes
Pale winding trails inside the leafLeaf minersBetween the upper and lower leaf surface
Ragged holes and shiny slime trailsSlugs or snailsUnder the pot, in the saucer, in the root ball
Tiny white bugs that jump on the soil after wateringSpringtails (harmless)Soil surface, saucer
Tiny white or brown dots crawling slowly on the soilSoil mites (harmless)Soil surface, bark, dead leaves

Sticky leaves are a clue on their own. Honeydew, the sugary liquid that makes leaves shiny and sticky, comes from sap-feeding insects: soft scales, mealybugs, aphids and whiteflies (UC IPM). Spider mites and thrips don't make it.

Pests on the Leaves and Stems

Spider mites

The key sign is many tiny pale dots across the upper leaf surface, often with fine silk between leaves and stems in heavier infestations. Adult mites are less than 1/20 inch long and live mainly on leaf undersides (UC IPM). To confirm, tap a leaf over white paper and watch for specks that start to walk. Severity is high: a generation can be completed in less than a week when conditions suit them, so act within a few days.

See Spider Mites on Houseplants: How to Spot and Get Rid of Them.

Mealybugs

Look for white, cottony clusters in leaf axils and on leaf undersides (Iowa State). Each is a soft insect about 1/8 to 1/4 inch long that moves very sluggishly (Clemson). Press a clump with a cotton swab: a living mealybug squashes into a wet smear, while dust or mineral crust stays dry. Severity is high, because mealybugs hide in tight spots and keep hatching, so they take weeks of repeated treatment.

See Mealybugs on Houseplants: How to Identify and Get Rid of Them.

Scale insects

Scale looks like small bumps clustered or lined up along stems and leaf veins, usually on the underside (Iowa State), rather than like bugs. They don't move once settled, and a live scale can be removed with a fingernail. Soft scales drip sticky honeydew; armored scales don't (Clemson). Severity is medium: they build slowly but are hard to clear once widespread.

Thrips

Thrips leave silvery to brownish scarring on leaves, dotted with dark specks of excrement, and can distort new growth and flowers (UC IPM). The insects are slender and less than 1/20 inch long, so you need a phone zoom or hand lens to see them (Clemson). Part of the life cycle is spent in the soil or leaf litter, and a generation can take as little as 2 weeks (UC IPM). Severity is medium; treat within a week.

Aphids

Aphids are small, soft, pear-shaped insects about 1/16 to 1/8 inch long, usually green but sometimes other colors, and some look woolly (Clemson). They cluster on growing points and leaf undersides, and new leaves turn curled, yellow or deformed (Iowa State). With zoom, most species show two small tubes (cornicles) projecting from the rear end (UC IPM). Severity is medium, but act within days: in warm conditions a newborn aphid can be reproducing in seven to eight days (UC IPM). Light infestations can often be knocked off with a spray of water (Iowa State).

Whiteflies

Whiteflies look like tiny white moths and flutter around the plant when it's disturbed (Clemson). Their young are oval, legless and don't move, so they look like pale scales on leaf undersides (UC IPM). Both adults and young produce honeydew. Severity is medium; Iowa State recommends yellow sticky traps plus several weekly treatments aimed at leaf undersides.

Broad and cyclamen mites

These mites are about 1/100 inch long and can't be seen without a microscope or at least a 20x hand lens (UC IPM). The clue is the damage: new leaves come out cupped, curled, dwarfed, thickened and stiff, and the plant can look stunted or tufted while older leaves look normal. African violet, begonia, ivy and impatiens are among the hosts UC IPM lists. Severity is high, because the damage is serious and they spread on infested plant material.

Leaf miners

Leaf miner larvae feed between the upper and lower leaf surfaces, leaving a winding, discolored trail or an irregular blotch inside the leaf (Clemson). Hold the leaf up to the light: the damage is a tunnel inside the leaf, not a mark on the surface. Clemson calls the damage unsightly but rarely serious. Removing affected leaves is usually enough.

Slugs and snails

Irregular holes that appear overnight, plus shiny slime trails on leaves, the pot or the windowsill, point to slugs or snails. They are most active at night (UC IPM). Indoors, Clemson notes they hide along the outside of the root ball in small cavities, so slide the plant out of its pot to find them. Picking them off and bagging them is the main fix, and severity is low.

Pests in the Soil and Roots

Fungus gnats

Fungus gnats are small, black, weak-flying insects about 1/8 inch long that run or fly near the soil surface (Clemson). Their whitish larvae have shiny black heads and live in the top of wet potting mix. Iowa State describes them as mainly a nuisance with minimal plant damage. The cure starts with letting the soil surface dry between waterings; yellow sticky traps help you monitor them.

See Fungus Gnats: Causes and How to Get Rid of Them.

Root mealybugs

Suspect root mealybugs when a plant slowly yellows, wilts or stops growing and you can't find anything on the leaves. UC IPM says they concentrate on the outer part of the root ball, between the roots and the pot, and leave white powdery wax on the soil near the stem. NC State notes the wax can give the soil a bluish tint and that the insects sometimes crawl out of drainage holes into nearby pots. Severity is high; unpot the plant to confirm.

Harmless Look-Alikes (No Treatment Needed)

Not everything that moves or looks odd is a pest.

Springtails

Springtails are pinhead-sized, about 1.5 mm long (CSU Extension), and jump using a fork-like structure folded under the body. They show up on the soil surface or in the saucer, especially right after watering. They feed on fungi, algae and decaying plant matter and do very little, if any, damage to houseplants. Clemson notes their presence is usually a sign of overwatering, so the fix is letting the soil dry down a bit more between waterings.

Soil mites

Soil mites are small white or brown mites crawling across the soil surface (UKHouseplants). They never jump or fly and stay at or below the soil line, which separates them from spider mites on the leaves. Most are decomposers that feed on rotten roots, bits of bark, fungi and other organic matter. They favor potting mix that stays moist or pots in darker spots.

Natural nectar glands

Some plants, including philodendron, alocasia and colocasia, have extrafloral nectaries: glands outside the flower that release small sticky droplets on leaf backs or leaf stalks (Plants For All Seasons). They are usually under 1 mm, often with a colored border, and are a normal part of the plant. A scale insect lifts off with a fingernail; a nectary is part of the leaf and needs no treatment.

General First Steps for Any Pest

  1. Isolate the plant. Iowa State advises isolating infested plants to stop pests spreading to other houseplants
  2. Inspect the neighbors. Check leaf undersides, leaf joints, stems and shoot tips on every plant that was nearby, plus the pot rims and saucers
  3. Tap a leaf over white paper. Specks that walk point to mites or thrips; nothing moving rules out many pests
  4. Check for stickiness. Sticky leaves or furniture below the plant point to honeydew producers: scale, mealybugs, aphids or whiteflies
  5. Unpot a declining plant. If a plant is fading and the leaves look clean, look at the roots for white wax, insects or rot
  6. Identify before you spray. CSU notes the right approach depends on the specific pest. Insecticidal soap also injures some plants (Clemson lists ivy, maidenhair fern, dieffenbachia, jade plant and begonia among them), so test a few leaves first

If the leaves also have a black film, it's sooty mold growing on honeydew. It doesn't infect the plant and washes off with water or soap and water, but it returns until the insects producing the honeydew are controlled (UC IPM).

How to Prevent Houseplant Pests

  • Quarantine new plants. Clemson recommends isolating new plants for six weeks and examining them about once a week, paying attention to leaf undersides
  • Check plants each time you water. Leaf undersides, leaf joints and new growth are where most pests start
  • Don't keep the soil constantly wet. Fungus gnats and springtails both thrive in wet potting mix. See How to Water Houseplants: The Beginner's Guide
  • Inspect roots when you repot. It's the only way to catch root mealybugs early

Frequently Asked Questions

What are the tiny white bugs on my houseplant?

It depends on where they are and how they move. Cottony clumps on stems are mealybugs, white insects that fly up are whiteflies, and tiny white bugs that jump on the soil are springtails.

Can houseplant pests spread to my other plants?

Yes. Mites, mealybug and scale crawlers, and root mealybugs can all move to nearby plants, and adult whiteflies, thrips and fungus gnats fly. Isolate first and check the neighbors.

Do I need to throw away a plant with pests?

Usually not. Iowa State and CSU both advise discarding heavily infested plants, but light and moderate infestations can be treated. Harmless soil bugs are never a reason to discard a plant.

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