What Do Spider Mite Eggs Look Like? Tiny Clear Spheres

Spider mite eggs are translucent spheres about 0.1 mm across, laid on leaf undersides in webbing. Here is how to see them and tell them from other specks.

By Zakaria October 6, 2026 3 min read Save to Pinterest

Fine webbing strung between the leaves and growing tips of a shrub, lit from behind — Photo: wal_172619, Pixabay Content License, via Pixabay

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Spider mite eggs are round, translucent and about 0.1 mm across — glass beads scattered on the underside of a leaf, usually caught in the fine webbing the adults leave behind. You will almost certainly find the webbing and the leaf stippling first.

The short answer

Spider mite eggs are perfectly spherical, translucent to pearly white, and roughly 0.1 mm across — about the size of a grain of fine dust. They are laid singly on leaf undersides, concentrated along the midrib and larger veins and within the fine webbing the adults spin. As they mature they take on a faint amber tint and a dark spot appears inside shortly before hatching. At that size they read as a dusty sheen to the naked eye, so a 30x loupe or a phone macro lens is what turns them into recognisable objects.

Round, clear to pearly, about 0.1 mm — like minute glass beads
Underside of leaves, along the veins, inside the webbing
Amber with a dark centre just before hatching
Need a loupe or phone macro to see properly
Hatch in ~3 days warm, two weeks or more when cool
Most sprays do not kill eggs — treat on a repeat schedule

How to actually see them

Turn a leaf over. Everything happens on the underside.
Look along the midrib and the larger veins — that is where they cluster.
Use a 30x jeweller’s loupe or your phone’s macro mode. At 0.1 mm there is no alternative.
Tap the leaf over white paper. Moving specks are adults, and confirm the infestation even when you cannot resolve the eggs.

The paper tap test is the one that needs no equipment

Hold a sheet of white paper under a suspect leaf and tap it sharply. Dust does not walk. Specks that move after a few seconds are mites.

Telling them from the other white specks

This table answers the question on its own

	Spider mite eggs	Whitefly eggs	Scale / shed skins	Dust, perlite, hard water
Shape	Perfect spheres	Oval	Flat flecks	Irregular
Arrangement	Singly, along veins	Often arcs or circles	Scattered	Random
Webbing	Yes	No	No	No
Leaf damage	Fine yellow stippling above	Sticky honeydew	Yellow blotches	None
Move when tapped?	Adults do	Adults do	No	No

Why they are always on the underside

Spider mites want shelter, warmth and dry air. The underside of a leaf gives them all three, plus protection from rain and from anything you spray downward.

They concentrate in the lower and inner parts of the plant first, which is why an infestation is usually well established before the stippling on the upper surfaces becomes obvious from a distance.

The speed is the whole problem

In hot dry conditions the cycle from egg to egg-laying adult can run in under a week. Eggs hatch in about three days around 30°C / 86°F.

One treatment will not do it

Insecticidal soap and horticultural oils kill mobile mites on contact and do very little to the eggs. Everything laid before you sprayed hatches afterwards. Treat every five to seven days for three or four rounds, so each new generation is caught after hatching and before it lays.

What works, practically

Spray the undersides, thoroughly, to the point of run-off — a top-down spray misses the entire population
Insecticidal soap or horticultural oil, repeated on the five-to-seven-day schedule
Raise the humidity where you can. Spider mites thrive in hot dry air and struggle in damp
Hose plants down in the open garden; physical removal genuinely dents the population
Isolate new plants for a fortnight before they join the rest
Check weekly afterwards. Re-infestation from a missed pocket is normal

Common questions

What do spider mite eggs look like?

Perfectly round, translucent spheres roughly 0.1 mm across — about the size of a grain of fine dust — laid singly on the underside of leaves, usually alongside the veins and within the fine webbing the adults produce. Fresh eggs are clear to pearly white and look like tiny glass beads; as they mature they take on a faint amber or straw tint and a dark spot becomes visible inside just before hatching. They are too small to see clearly with the naked eye, which is why most people find the webbing first.

Can you see spider mite eggs without a magnifier?

Barely, and not reliably. At around 0.1 mm they read as a faint dusty sheen on the leaf underside rather than as individual objects. A cheap 30x jeweller's loupe or a phone camera with its macro mode turns them into obvious spheres. If you want a naked-eye test instead, hold a sheet of white paper under the leaf and tap it — dislodged adults appear as moving specks, which confirms an infestation even when you cannot resolve the eggs.

Where do spider mites lay their eggs?

On the undersides of leaves, concentrated along the midrib and the larger veins, and tucked into the webbing that gives the pest its name. They favour the sheltered parts of the plant: lower leaves, the inside of dense growth, and the junctions where leaf meets stem. This is why spraying the tops of leaves achieves so little — the entire population, eggs included, is on the surface you cannot see from above.

How long do spider mite eggs take to hatch?

Roughly three days in warm conditions around 30°C / 86°F, stretching to two weeks or more when it is cool. The whole life cycle from egg to egg-laying adult can run in under a week in hot dry weather, which is why an infestation seems to explode out of nowhere. That speed is also the reason a single treatment never works: eggs laid before you sprayed hatch afterwards.

Do spider mite treatments kill the eggs?

Most do not. Insecticidal soap and horticultural oils work by contact on mobile stages and have limited effect on eggs, and many miticides are similarly weak against them. The practical consequence is that you treat on a repeating schedule — roughly every five to seven days for three or four rounds — so that each new generation is caught after hatching and before it can lay. Stopping after one apparently successful treatment is the most common reason infestations come back.

What else looks like spider mite eggs?

Several things. Whitefly eggs are oval rather than spherical and often laid in arcs or circles. Scale insect crawlers and shed skins look like flat flecks rather than beads. Perlite dust, hard water deposits and leaf trichomes all read as white specks at low magnification but do not sit in webbing and do not move. The combination that identifies spider mites is fine webbing, stippled yellow speckling on the upper leaf surface, and moving specks on a tapped sheet of paper.

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