Thrips vs. Spider Mites

Thrips and spider mites can cause surprisingly similar damage to plants, but the pests themselves are very different. Thrips are tiny, slender insects with six legs, and most adults have narrow wings fringed with long hairs. Spider mites are even smaller arachnids related to spiders and ticks. Adult spider mites have eight legs, oval bodies, no wings, and many pest species produce fine silk webbing on infested plants. Webbing is one of the strongest clues pointing toward spider mites rather than thrips.

The confusion usually starts with the plant rather than the pest. Both can cause pale stippling, discoloration, yellowing, and declining leaves, so damage alone can overlap considerably. A closer inspection provides better evidence. Thrips may leave silvery or scarred areas and tiny dark fecal spots, while spider mite colonies commonly develop on leaf undersides and can eventually cover leaves and stems with fine webbing. Finding the actual pest is therefore much more reliable than trying to diagnose either one from a discolored leaf.

What Is the Main Difference Between Thrips and Spider Mites?

Thrips are insects in the order Thysanoptera. Like other adult insects, they have six legs, and most familiar adult pest thrips have two pairs of narrow fringed wings. Their bodies are elongated and slender, often resembling tiny moving lines. Spider mites are not insects at all. They belong to the arachnid group and are related to spiders and ticks. Adult spider mites have eight legs and much more rounded or oval bodies.

That structural difference becomes obvious with adequate magnification. The adult spider mite has an oval body and eight legs, while an adult thrips has a long, narrow body and characteristic fringed wings. Spider mites are also capable of producing silk webbing, something thrips do not do. Consequently, body shape, leg number, wings, and webbing provide a much stronger identification than color because both groups can occur in several shades.

What Do Thrips Look Like Compared With Spider Mites?

Thrips are elongated from head to abdomen. Depending on the species and life stage, they can be translucent white, cream, yellow, orange-yellow, brown, or almost black. Adult thrips generally have narrow wings folded along the back, although the wings are difficult to see without magnification. Immature thrips remain wingless and are frequently paler than adults. Our detailed guide to what thrips look like covers those identifying characteristics more closely.

Spider mites look more like tiny moving dots. Adult females of common spider mites are less than 1/20 inch long, and their bodies are oval rather than linear. The twospotted spider mite, one of the most familiar pest species, is about 1/50 inch long and typically yellow-orange with a dark spot on each side of its body. Those markings require magnification to appreciate properly. At normal viewing distance, you may notice only tiny dots moving slowly across the underside of a leaf.

Are Spider Mites Smaller Than Thrips?

Spider mites can be extremely small and are often harder to see clearly than adult thrips. Twospotted spider mites, for example, are only about 1/50 inch long. Many common pest thrips are roughly 0.5 to 1.5 millimeters long, although some species are larger. Size therefore provides some useful context, but it should not become the deciding characteristic.

Shape is more dependable. A thrips can look like a tiny moving dash because its body is exceptionally narrow, while a spider mite resembles a minute oval or rounded dot. This difference can remain visible even when exact measurements are impossible. Our article on how big thrips are explains why their narrow bodies can make them appear smaller than their measured length suggests. With spider mites, a 10X hand lens is particularly useful because their legs, body markings, and other identifying features are difficult to resolve with normal vision.

Do Thrips or Spider Mites Make Webs?

Spider mites make silk webbing. Thrips do not. This is one of the most useful distinctions between the two pests. Webspinning spider mites produce fine silk over infested plant surfaces, and heavy populations can create dense webbing across leaves, stems, twigs, and other plant structures. The presence of silk webbing is a particularly useful way to distinguish spider mites from thrips and other small plant pests.

However, the absence of webbing does not automatically rule out spider mites. Low populations may be present before enough silk accumulates to become obvious, and some webbing becomes easier to see only when viewed closely or under favorable lighting. Therefore, visible webbing strongly supports a spider mite diagnosis, but no visible webbing means you should keep inspecting. Check the undersides of stippled leaves with a hand lens for mites, eggs, and finer strands that might otherwise go unnoticed.

What Does Spider Mite Webbing Look Like?

Spider mite webbing is extremely fine and can resemble a delicate transparent veil stretched across a leaf surface. Early in an infestation, you may see only individual silk strands between leaf veins or around the underside of a leaf. As populations increase, the webbing can become dense enough to cover leaves, petioles, stems, and growing tips. Numerous mites and eggs may be protected beneath it.

Do not confuse this webbing with a single ordinary spider web passing through a plant. Spider mite silk tends to remain closely associated with the infested foliage and the colonies feeding beneath it. The webbing may span relatively small spaces across leaf surfaces rather than forming the larger organized structures produced by many spiders. If magnification reveals tiny oval mites moving beneath fine silk on stippled foliage, spider mites become a much stronger identification.

How Many Legs Do Thrips and Spider Mites Have?

Adult thrips have six legs because they are insects. Thrips larvae also have six legs. Adult spider mites have eight legs because they are arachnids. This difference sounds simple, but counting legs on either pest usually requires magnification because both are extremely small.

Spider mite development adds one interesting exception. Newly hatched spider mite larvae have six legs, while the later nymphal stages and adults have eight. The six-legged larva develops into eight-legged later stages, so counting six legs on a very young mite would not distinguish it from an insect by itself. On mature specimens, however, eight legs combined with an oval body and associated webbing strongly supports a spider mite identification.

Do Spider Mites Have Wings Like Thrips?

No. Spider mites do not have wings. They move by crawling and can also disperse to new plants with the assistance of wind. Adult thrips, by contrast, commonly have two pairs of extremely narrow fringed wings and can actively fly. Air currents can also carry these tiny insects beyond the distances they would cover through powered flight alone.

The difference becomes especially useful when an unknown pest flies away from a plant. A spider mite cannot suddenly take flight using wings because it has none. A mature thrips can. However, immature thrips are also wingless, so an insect that remains on the leaf is not automatically a mite. Our article on whether thrips can fly explains how adult flight differs from the movement of their wingless immature stages.

What Does Thrips Damage Look Like Compared With Spider Mite Damage?

The damage can overlap enough that inspecting the pests themselves is important. Thrips feeding can create stippling, scarring, silvery or darkened patches, distorted growth, and injured flowers or fruit. Tiny dark fecal spots may occur around feeding areas. Some thrips feed within flowers, buds, growing tips, or other protected structures, so their injury may become more obvious as damaged tissue expands.

Spider mites typically cause numerous tiny pale spots called stippling as they remove cell contents from leaves. As feeding intensifies, foliage may become yellowish, grayish, bleached, or bronze before drying and dropping. The progression from pale stippling to bronzed or yellow foliage is particularly characteristic of substantial spider mite feeding. Unfortunately, thrips can also cause stippling, so the presence of webbing, mites, eggs, fecal spots, and the exact pattern of injury should all be considered together.

Do Spider Mites Leave Black Spots Like Thrips?

Thrips can leave tiny dark or shiny fecal deposits around their feeding sites. When those spots occur alongside elongated insects and silvery or scarred tissue, they can provide valuable supporting evidence. The combination of thrips feeding injury and shiny black excrement can be particularly useful when comparing thrips with mites.

Spider mite infestations are better known for stippling, bronzing, mites, eggs, and silk webbing rather than the characteristic shiny black fecal spots associated with thrips. Therefore, a leaf showing silvery damage and numerous tiny dark deposits but no webbing deserves a close inspection for thrips. Conversely, stippled foliage covered with fine silk and tiny oval mites strongly points toward spider mites.

Where Do Thrips Live Compared With Spider Mites?

Thrips can occupy several aboveground plant structures. Depending on the species, they may feed on leaves, flowers, buds, fruits, tender shoots, or inside distorted and folded foliage. Many pest species prefer protected areas, which means you may find them deep inside flowers or other plant crevices rather than exposed on a broad leaf surface.

Spider mites commonly form colonies on the undersides of leaves. This protected location gives them access to plant tissue while reducing exposure to environmental conditions and some natural enemies. Eggs, immature mites, adults, shed skins, and webbing may all occur together within a colony. When you suspect mites, turning over damaged leaves is therefore essential. When you suspect thrips, your inspection should extend beyond leaf undersides to flowers, buds, growing tips, and other protected areas associated with signs of a thrips infestation.

What Do Baby Thrips Look Like Compared With Young Spider Mites?

Young thrips are narrow, wingless insects. Their first and second feeding stages are commonly translucent white, cream, yellowish, or light orange, depending on the species. They have legs and antennae and actively move across suitable plant tissue while feeding. Our article on what thrips larvae and nymphs look like explains how those stages differ from the adults and later prepupal and pupal stages.

Spider mites hatch as six-legged larvae. After molting, they enter nymphal stages with eight legs before eventually becoming adults. Their immature forms maintain the compact mite-like body rather than developing the elongated shape of thrips. Spider mite colonies may contain spherical translucent eggs, larvae, nymphs, and adults together beneath webbing. Seeing several tiny rounded developmental stages concentrated on a leaf underside therefore creates a very different picture from finding narrow thrips larvae moving through flowers or across foliage.

What Do Thrips Eggs Look Like Compared With Spider Mite Eggs?

The eggs are quite different when you can see them clearly. Many plant-feeding thrips insert their elongated, oval, cylindrical, or kidney-shaped eggs into plant tissue, leaving the eggs partly or completely concealed. Other species place eggs more openly in protected plant structures. This variation is covered more closely in our article on what thrips eggs look like.

Spider mite eggs are generally spherical and translucent when first laid, becoming cream colored before hatching. They can resemble tiny droplets or miniature beads on the leaf surface. The round translucent eggs of spider mites may occur alongside mites and webbing on leaf undersides. Therefore, clusters of exposed round eggs among webbing point much more strongly toward spider mites than toward the many thrips species that conceal eggs within plant tissue.

Do Thrips and Spider Mites Like the Same Conditions?

Their outbreaks do not respond identically to environmental conditions. Spider mites are particularly associated with hot, dry, dusty conditions, and water-stressed plants can suffer more severe mite problems. Populations can reproduce rapidly during warm weather, which is why spider mite outbreaks may seem to develop suddenly during dry summer periods. The relationship between spider mites, hot weather, dust, and plant water stress is important enough to influence management recommendations.

Thrips populations are also affected by temperature, plant condition, host availability, and species-specific biology, but “hot and dry” should not be treated as a universal diagnostic rule for thrips. Several species occupy protected flowers and growing tissues, and different thrips have different environmental relationships. Weather can therefore support your diagnosis, but the insect’s anatomy and the signs on the plant remain much stronger evidence.

Can Thrips Eat Spider Mites?

Some can. This is an important exception to the assumption that every thrips on a mite-infested plant is another pest. Certain thrips are predators, and some feed on spider mites and their eggs. Sixspotted thrips (Scolothrips sexmaculatus), for example, are natural enemies of pest mites and can contribute to biological control.

That creates an unusual situation in which thrips and spider mites can appear on the same plant for completely different reasons. A plant may contain damaging spider mites while predatory thrips are there feeding on them. Automatically killing every thrips you see could therefore remove a beneficial predator. Our overview of different thrips species explains why identifying the role of a thrips can matter just as much as identifying the insect itself.

Can a Plant Have Pest Thrips and Spider Mites at the Same Time?

Yes. A plant can support both plant-feeding thrips and spider mites simultaneously. The presence of webbing does not prove that every tiny arthropod on the plant is a spider mite, just as finding thrips does not rule out a mite colony elsewhere on the foliage. Mixed infestations can produce overlapping symptoms and make the plant’s appearance particularly difficult to interpret.

When several pests may be present, inspect individual specimens instead of assigning one identity to everything that moves. Look for elongated thrips, oval eight-legged mites, webbing, round mite eggs, thrips fecal spots, and the location of each population. Also remember that predatory thrips and predatory mites can occur among pest populations. Correct identification prevents beneficial species from being mistaken for additional pests.

How to Tell Whether You Have Thrips or Spider Mites

Begin with the undersides of damaged leaves. Use a hand lens and look for tiny oval mites, spherical eggs, and fine silk. If you find these together, spider mites are strongly indicated. You can also hold white paper beneath a leaf and tap or shake the foliage. Dislodged spider mites will look like extremely small moving dots, and magnification will reveal their compact bodies.

Use the same white-paper method when looking for thrips, but pay attention to a different shape. Dislodged thrips should appear elongated rather than round. Then inspect flowers, buds, tender growth, and other protected areas for additional adults or pale wingless larvae. The combination of a narrow insect, characteristic feeding injury, and tiny dark fecal spots provides much stronger evidence for thrips than plant discoloration alone.

What to Do After You Identify the Pest

If you confirm spider mites, avoid jumping immediately to a broad-spectrum insecticide. Spider mites have numerous natural enemies, and some broad-spectrum insecticides can kill those predators while failing to provide good mite control, potentially allowing mite populations to increase. Keeping plants appropriately watered, reducing dusty conditions, washing foliage where suitable, and preserving natural enemies are important parts of spider mite management. Insecticidal soaps or horticultural oils can be considered when additional control is necessary and the product is labeled for the plant and intended use.

If you confirm damaging thrips instead, concentrate on the plant areas and developmental stages involved. Remove heavily infested plant material where appropriate, inspect nearby susceptible plants, and use cultural and physical measures before escalating to targeted treatments. Because some thrips eggs are concealed within plant tissue and later developmental stages may occupy protected locations, one inspection rarely reveals the entire population. Our dedicated article on how to get rid of thrips covers that management process in detail.