“Small and white” is one of the most common descriptions people bring to the front desk, and one of the least useful on its own, because nine different creatures fit it. What sorts them out is not colour but three questions: where was it, did it jump, fly or crawl, and was it fuzzy or smooth. Answer those and the list collapses to one or two.
On a plant
Whiteflies. Tiny, pure white, wedge-shaped, resting under the leaves and rising in a cloud when you brush the plant. They suck sap and leave sticky honeydew. A plant pest and nothing else; rinse the leaves or hang a yellow sticky card.
Mealybugs. White, cottony, waxy blobs tucked into leaf joints and along stems, moving very slowly if at all. Also sap-suckers, also plant-only. A cotton bud dipped in rubbing alcohol lifts them off.
Woolly aphids. Fluffy white masses on stems, twigs and bark, often on fruit trees, looking like mould until you see them move. Under the fluff they are ordinary aphids. Ladybirds and lacewings eat them; a hose works too.
Scale insects (some species). Flat white or cream bumps stuck to stems, not moving. Scrape one off and it is soft underneath. Plant pest.
In a damp room
Springtails. Pinhead-sized, pale grey to white, and they jump: touch one and it vanishes. Found on bathroom floors, in plant pots, in cellars and on the surface of standing water. They eat mould and decay, and their presence means damp, not dirt. Card #141 is the round garden kind; the indoor ones are its slimmer relatives.
Booklice. Pale, soft, about 1 mm, walking slowly across a page, a wall or a windowsill. Not lice at all: they eat the microscopic mould that grows on paper and plaster in humid rooms. Dry the room and they go. Harmless to people.
Silverfish. Often reported as white but actually silvery-grey, carrot-shaped and up to about 1.5 cm, running with a fish-like wiggle. They eat starch: paper, glue, cardboard. Card #140, and a full silverfish guide.
In food
Pantry larvae. Pale, wriggling, a few millimetres long, in flour, oats, nuts, dried fruit or pet kibble. They are the young of pantry moths or grain beetles. Find the packet with webbing or clumped grains, bin it, wipe the shelf. Card #100 is one of the beetles whose larvae turn up in old stored grain.
Maggots. Smooth white fly larvae, tapered at one end, in a bin or on something that has gone off. Card #124 and #127 are the usual parents. Empty and rinse the bin; the smell is what attracted the fly.
In wood
Termite workers. Soft, creamy white, blind, ant-sized, and they die within minutes in open air, so you only see them when you break into infested wood or a mud tube on a wall. This is the one white insect that is a building problem. Card #145. If you see white ant-like insects pouring out of a beam or a skirting board, photograph it and call someone who inspects timber.
Things that are not insects
Dust mites are too small to see; if you can see it, it is not a dust mite. Mould does not move. Mite eggs and insect eggs on plants are white specks that never walk. A hand lens or a phone camera at maximum zoom settles most of these in seconds.
The quick sort
| Where | Moves how | Fuzzy? | Most likely |
|---|---|---|---|
| Plant leaves | Flies up in a cloud | No | Whitefly |
| Plant stems, leaf joints | Barely moves | Yes, cottony | Mealybug |
| Twigs, bark | Barely moves | Yes, woolly | Woolly aphid |
| Bathroom floor, pots | Jumps | No | Springtail |
| Paper, walls | Walks slowly | No | Booklouse |
| Floor, cupboards, at night | Runs, wiggles | No, silvery | Silverfish |
| Flour, cereal, kibble | Wriggles | No | Pantry larva |
| Bin, spoiled food | Wriggles | No | Maggot |
| Inside wood, mud tubes | Crawls, dies in light | No | Termite worker |
Front desk note: white plus jumping is a springtail, white plus a cloud is whiteflies, white plus wood is a termite. Those three rules cover most of the photos we see.
Not sure which row you are in? A photo in the identifier gives a name and a safety read, and the Field Guide has where each species lives and when it is active.
Questions
What are the tiny white bugs on my plants?
Usually one of three sap-suckers: whiteflies (fly up in a cloud when touched), mealybugs (cottony, waxy blobs in the leaf joints) or woolly aphids (fluffy white masses on stems and bark). All three are plant pests and none of them bite people.
What are the tiny white bugs in my bathroom?
Most often springtails, which jump when disturbed, or booklice, which walk and are pale rather than white. Both are moisture indicators and harmless. Silverfish are larger and silvery-grey rather than white.
Are white bugs in the house dangerous?
No. None of the common small white insects found indoors bite or sting. The two worth acting on are termite workers, which are white and mean a colony in wood, and pantry pests, whose pale larvae mean an infested packet.
What are white worms in my kitchen?
Pale, wriggling larvae in flour, cereal, nuts or pet food are usually pantry moth or beetle larvae. Small white maggots in a bin are fly larvae. Either way, the fix is the same: find and bin the source, then clean the shelf.
