Aphids, Scale Insects, Thrips and Barklice of Columbia County, Oregon

Aphids and Scale Insects are true bugs which feed on the sap of plants and trees. Thrips and Barklice are primitive insect families considered either part of the True Bugs or closely related to them. All of these insects are small and often found congregating on plants in large numbers.

Aphids (Aphidoidea)

Aphids are small insects with soft bodies that feed in large groups on plant juices. They are most closely related to “spruce aphids” and then scale insects. Some aphids feed on the same plant all year round while others spend the summer on one type of plant and the winter on another.

The aphids here are roughly organized by the plants they’re found on, which is the best way to ID them. Identification can best be done using the aphids page at Influential Points and Aphids on the World’s Plants.

Mottled Arum Aphid Neomyzus circumflexum lilies camellia chrysanthemums columbia county northwest oregon
Mottled Arum Aphid (Neomyzus circumflexum) – To 0.1″. Pale yellow to bright green with broken crossbands in front and a blotch on abdomen. Found on numerous plants including lilies, camellia, and chrysanthemums. (photo © John Bebbington)
Brown Ambrosia Aphid Uroleucon ambrosiae aster fireweed sowthistle goldenrod lettuce columbia county northwest oregon
Brown Ambrosia Aphid (Uroleucon ambrosiae) – 0.1″-0.14″. Brown to reddish-brown or dull red with black spikes. Feed on ambrosia, aster, fireweed, sowthistle, goldenrod, and lettuce. (photo © Jesse Rorabaugh)
Foxglove Aphid Aulacorthum solani plants flowers columbia county oregon
Foxglove Aphid (Aulacorthum solani) – To 0.12″. A pear-shaped greenish-yellow aphid with dark joints on the antennae. Winged adults have black bars. Found on numerous different flowers and plants. Introduced from Europe. (photo © Mihajlo)
Rose Aphid Macrosiphum rosae beans potato tomato sunflower columbia county northwest oregon
Rose Aphid (Macrosiphum rosae) – 0.07:-0.14″. Pink to reddish-brown or green with long black spikes and a pale tail. Moves from roses to holly, beans, or wild teasel. Introduced from Europe. (photo © giantcicada)
Rose-Grain Aphid Metopolophium dirhodum rose wheat barley columbia county northwest oregon
Rose-Grain Aphid (Metopolophium dirhodum) – 0.06″-0.12″. Yellowish-green or light green with a dark green midstripe. Moves from rose bushes to grains such as wheat or barley. Introduced from Eurasia. (photo © Jesse Rorabaugh)
Potato Aphid Macrosiphum euphorbiae rose cabbage lettuce tomato columbia county northwest oregon
Potato Aphid (Macrosiphum euphorbiae) – 0.1″-0.15″. Grayish-green (sometimes pink), with very long antennae and spikes. Moves from roses to numerous vegetables and flowers including potato, tomato, and cabbage. (photo © James Bailey)
Cowpea Aphid Aphis craccivora legumes peas beans columbia county northwest oregon
Cowpea Aphid (Aphis craccivora) – To 0.09″. Dark brown to black with protrusions from the back of the abdomen. Found on many plants but mostly legumes, peas and beans. Introduced from Eurasia. (photo © Jesse Rorabaugh)
Cabbage Aphid Brevicoryne brassicae cabbage broccoli cauliflower columbia county northwest oregon
Cabbage Aphid (Brevicoryne brassicae) – To 0.1″. Grayish-green with waxy white covering. Produces toxins. Feeds on vegetables like cabbage, broccoli, and cauliflower. Introduced from Europe. (photo © Jonathan Frank)
Melon Aphid Aphis gossypii melon squash cotton columbia county northwest oregon
Melon Aphid (Aphis gossypii) – To 0.08″. Green to black, often light green in the middle and dark green on the ends. Black eyes/antennae. Found on numerous vegetables including melons, squash, and cotton. (photo © Sönke Bonde)

Shallot Aphid Myzus ascalonicus onion broccoli pumpkin strawberry tulip columbia county northwest oregon
Shallot Aphid (Myzus ascalonicus) – to 0.09″. Shiny green of various shades or even yellow with brown antennae and legs. Found on numerous crops including onion, broccoli, pumpkin, strawberry, and tulip. (photo © Influential Points)
Black Bean Aphid Aphis fabae beans potato tomato sunflower columbia county northwest oregon
Black Bean Aphid (Aphis fabae) – To 0.12″. Green-brown to black with plump body. Yellow eyes/antennae. Feeds on beans, potato, tomato, sunflower, and numerous other plants. Winters on shrubs. Introduced from Europe. (photo © Alexis)
Pea Aphid Acyrthosiphon pisum clover bean columbia county northwest oregon
Pea Aphid (Acyrthosiphon pisum) – To 0.2″. A green or pink aphid with black marks on the apices of the antennae. Found on vegetables including pea, clover, and bean. Introduced from Eurasia. (photo © Felix Riegel)
Poplar Petiole Gall Aphid Pemphigus populitransversus cabbage cottonwood columbia county northwest oregon
Poplar Petiole Gall Aphid (Pemphigus populitransversus) – to 0.1″. Light gray to greenish with white waxy coating. Moves from the roots of cabbage to make reddish-green galls with horizontal openings on the stem of cottonwood leaves. (photo © Joanne Redwood)
Willow-Umbellifer Aphid Cavariella pastinacae willows celery wild hemlock cow parsnip columbia county northwest oregon
Willow-Umbellifer Aphid (Cavariella pastinacae) – 0.07″-0.12″. Shiny light green (often lightest in middle) with paler yellow spikes. Moves from willows to celery, wild hemlock, and cow parsnip. Introduced from Europe. (photo © Influential Points)
Willow-Carrot Aphid Cavariella aegopodii willows carrots celery parsnip fennel columbia county northwest oregon
Willow-Carrot Aphid (Cavariella aegopodii) – 0.06″-0.11″. Green or reddish, with yellow spikes and legs. Moves from willows to carrots, celery, parsnip, fennel, and related plants. Introduced from Europe. (photo © Jesse Rorabaugh)
Small Willow Aphid Aphis farinosa columbia county northwest oregon
Small Willow Aphid (Aphis farinosa) – To 0.1″. Dull mottled green with long pale spikes on back. Found on the youngest shoots of willow. (photo © James Bailey)
Giant Willow Aphid Tuberolachnus salignus columbia county northwest oregon
Giant Willow Aphid (Tuberolachnus salignus) – To 0.23″. Gray to brown with a gold sheen. Small dark spots and very dark tubercles in back. Found on willows. Introduced from Europe. (photo © Kasper Malmberg)
Black Willow Bark Aphid Pterocomma salicis columbia county northwest oregon
Black Willow Bark Aphid (Pterocomma salicis) – To 0.18″. Black with numerous white spots in distinct rows. Orange legs and spikes. Found on willow twigs. Introduced from Europe. (photo © Nathanial Sharp)
Bead-like Cottonwood Gall Aphid Thecabius populimonilis willow columbia county northwest oregon
Bead-like Cottonwood Gall Aphid (Thecabius populimonilis) – To 0.12″. This waxy yellowish-olive aphid hides in small round reddish-green galls. Moves between the leaves of cottonwood and the roots of willow. (photo © Sawyer Baran)
Rosebay Willowherb Aphid Aphis salicariae dogwood columbia county northwest oregon
Rosebay Willowherb Aphid (Aphis salicariae) – To 0.1″. Reddish-brown to gray dusted with wax, small dark spikes in back. Moves between dogwood and willowherb. Introduced from Europe. (photo © InfluentialPoints)
Wooly Beech Aphid Phyllaphis fagi columbia county northwest oregon
Wooly Beech Aphid (Phyllaphis fagi) – 0.08″-0.13″. Bluish or green in color, often with dark bands, and covered in while wooly filliments. Found on beech trees. Introduced from Europe. (photo © Felix Riegel)
California Maple Aphid Periphyllus californiensis maple trees columbia county northwest oregon
California Maple Aphid (Periphyllus californiensis) – 0.08″-1.2″. Reddish-brown to olive-green with black crossbands. Found on maple trees. (photo © Marie Lou Legrand)
Small Walnut Aphid Chromaphis juglandicola english walnut columbia county northwest oregon
Small Walnut Aphid (Chromaphis juglandicola) – 0.05″-0.09″. Yellow or yellowish-white, sometimes with black marks. Found on English Walnut. Introduced from Europe. (photo © Influential Points)
Dusky-veined Walnut Aphid Panaphis juglandis english walnut columbia county northwest oregon
Dusky-veined Walnut Aphid (Panaphis juglandis) – 0.14-0.17″. Yellow with dark blotches on nymphs becoming black bands on adults. Found on English Walnut. Introduced from Europe. (photo © bersou)
Black Citrus Aphid Toxoptera aurantii fig sumac camellia columbia county northwest oregon
Black Citrus Aphid (Toxoptera aurantii) – To 0.08″. Reddish-brown to black with banded antennae. Often on citrus but here found on figs, sumac, and camellias. (photo © Influential Points)
Green Apple Aphid Aphis pomi apples pears hawthorn columbia county northwest oregon
Green Apple Aphid (Aphis pomi) – To 0.09″. Bright green with dark spikes on back. Found on apples, pears, hawthorn, and other related trees. Introduced from Europe. (photo © Paul Bowyer)
Spiraea Aphid Aphis spiraecola fruit trees apples pears plum shrubs columbia county oregon
Spiraea Aphid (Aphis spiraecola) – To 0.09″. Greenish-yellow to bright green with dark spikes in back. Moves between fruit trees and shrubs. (photo © Jesse Rorabaugh)
Hop Aphid Phorodon humuli plum trees hops columbia county northwest oregon
Hop Aphid (Phorodon humuli) – 0.04-0.1″. Pale yellow-green with three dark green stripes. Two long spikes in the back. Moves between plum trees and hops. Introduced from Europe. (photo © alderash)
Mealy Plum Aphid Hyalopterus pruni plum peach apricot cherry reed grasses columbia county northwest oregon
Mealy Plum Aphid (Hyalopterus pruni) – 0.06″-0.1″. Slender aphid, pale green or red with darker mottling and waxy covering. Moves from stonefruits (plum, peach, apricot, cherry) to reed grasses. Introduced from Mediterranean. (photo © Marie Lou Legrand)
Leaf-curling Plum Aphid Brachycaudus helichrysi peach apricot cherry goldenrod aster chrysanthemum columbia county oregon
Leaf-curling Plum Aphid (Brachycaudus helichrysi) – To 0.08″. White, yellow, green, or pink with slight wax. Causes leaves to roll up tightly. Moves from stonefruits to flowers like goldenrod, aster, and chrysanthemum. (photo © Alexis)
Short-beaked Clover Aphid Nearctaphis bakeri plum hawthorn clover nightshade columbia county northwest oregon
Short-beaked Clover Aphid (Nearctaphis bakeri) – 0.04″-0.1″. Light yellowish with dark green patches and dark speckles. Moves from plum and hawthorn to clover or nightshade. (photo © Influential Points)
Plum-thistle Aphid Brachycaudus cardui stonefruits peach apricot cherry  columbia county northwest oregon
Plum-thistle Aphid (Brachycaudus cardui) – To 0.09″. Brown, brownish-yellow, or greenish, with dark bars towards front and a large black spot behind. Moves between stonefruits and thistles. Introduced from Europe. (photo © Rolf Lawrenz)
Water Lily Aphid Rhopalosiphum nymphaeae stonefruits cherry plum peach apricot aquatic columbia county northwest oregon
Water Lily Aphid (Rhopalosiphum nymphaeae) – To 0.11″. Reticulated reddish-brown to olive. Moves from stonefruits to semi-aquatic plants, sometimes even going in water. Introduced from Europe. (photo © Cedric Lee)
Black Cherry Aphid Myzus cerasi bedstraw eyebrights speedwell columbia county northwest oregon
Black Cherry Aphid (Myzus cerasi) – 0.07″-0.1″. Shiny dark brown to black with yellow legs. Moves from cherry trees to bedstraw, eyebrights, and speedwell. Introduced from Europe. (photo © alderash)
Bird Cherry-Oat Aphid Rhopalosiphum padi peach plum cherry apricot grains columbia county oregon
Bird Cherry-Oat Aphid (Rhopalosiphum padi) – To 0.11″. Green, brown, or black with rust at the end of the abdomen. Moves from stonefruits onto grains. Introduced from Europe. (photo © Jesse Rorabough)
Green Peach Aphid Myzus persicae plum cherry apricot vegetables columbia county northwest oregon
Green Peach Aphid (Myzus persicae) – To 0.09″. Yellowish-green, sometimes green or pink. Moves from stonefruits to almost any vegetable or flower. Introduced from Asia. Considered a major pest. (photo © Jesse Rorabaugh)
Ornate Aphid Myzus ornatus cherry trees chrysanthemum violets pansies columbia county northwest oregon
Ornate Aphid (Myzus ornatus) 0.04″-0.07″. Dirty yellowish-green with dark green or brown markings. Found on cherry trees, chrysanthemum, violets, pansies, and several weeds. (photo © Influential Points)
Serviceberry Aphid Nearctaphis sensoriata serviceberry mountain ash columbia county northwest oregon
Serviceberry Aphid (Nearctaphis sensoriata) to 0.09″. Reddish-brown to blackish. Found on serviceberry and sometimes mountain ash. (photo © Andy Jensen)
Snowberry Aphid Aphthargelia symphoricarpi columbia county northwest oregon
Snowberry Aphid (Aphthargelia symphoricarpi) – To 0.11″. Dark blue, dusty green, or black with white crossbands. Found on snowberry. (photo © Jason Headley)
Strawberry Aphid Hayhurstia atriplicis wild rose sweetbriar columbia county northwest oregon
Strawberry Aphid (Hayhurstia atriplicis) – 0.04″-0.07″. Translucent yellow to greenish-yellow with long spikes. Found on wild and cultivated strawberry, as well as wild rose and sweetbriar rose. (photo © Influential Points)
Elder Aphid Aphis pomi elderberry carnations docks evening primrose northwest oregon
Elder Aphid (Aphis pomi) – To 0.14″. A round aphid, dark blue-green to gray with dark points in back. Moves from elderberry to carnations, docks, evening primrose, and other flowers. (photo © Else Mikkelsen)

Spindly Elderberry Aphid Macrosiphum stanleyi columbia county northwest oregon
Spindly Elderberry Aphid (Macrosiphum stanleyi) – 0.12″-0.17″. Narrow light green body, with long spindly legs and spikes. Found on elderberry. (photo © Andy Jensen)

Large American Raspberry Aphid Amphorophora agathonica columbia county northwest oregon
Large American Raspberry Aphid (Amphorophora agathonica) – To 0.19″. Pale green with brown legs. Antennae darken towards ends. Feed on raspberry bushes. (photo © Stephen Ausmus, USDA)
Salmonberry Aphid Amphorophora forbesi columbia county northwest oregon
Salmonberry Aphid (Amphorophora forbesi) – To 0.15″. Pale green with greenish legs. Found on the undersides of salmonberry leaves. (photo © Andy Jensen)
Blackberry-grass Aphid Tuberolachnus salignus grains columbia county northwest oregon
Blackberry-grass Aphid (Tuberolachnus salignus) – To 0.12″. Yellowish-green with small red or brown spots. Moves from blackberries to grasses/grains. Introduced from Europe. (photo © Kasper Malmberg)
Blackcurrant-Sowthistle Aphid Hyperomyzus lactucae columbia county northwest oregon
Blackcurrant-Sowthistle Aphid (Hyperomyzus lactucae) – 0.08″-0.13″. Transluscent green, with black blotches on winged adults. Moves from blackcurrant to sowthistle. Introduced from Europe. (photo © Influential Points)
Redcurrant Blister Aphid Cryptomyzus ribis currant columbia county northwest oregon
Redcurrant Blister Aphid (Cryptomyzus ribis) – 0.06″-0.09″. Whitish, yellow, or pale green with green middorsal stripe. Causes redcurrant and other currant leaves to blister red. Introduced from Europe. (photo © Nikita Gerasin)
Dogberry Aphid Nasonovia cynosbati  currants piggyback plant fringecups columbia county northwest oregon
Dogberry Aphid (Nasonovia cynosbati) – 0.07-0.12″. Pale green, sometimes suffused with dark green or red. Found on currants, piggyback plant, and fringecups. (photo © Influential Points)
Serviceberry Aphid Nearctaphis sensoriata columbia county northwest oregon
Serviceberry Aphid (Nearctaphis sensoriata) to 0.09″. Reddish-brown to blackish. Found on serviceberry and sometimes mountain ash. (photo © Andy Jensen)
Short-beaked Clover Aphid Nearctaphis bakeri columbia county northwest oregon
Short-beaked Clover Aphid (Nearctaphis bakeri) – 0.04″-0.1″. Light yellowish with dark green patches and dark speckles. Moves from plum and hawthorne to clover or nightshade. (photo © Influential Points)
Dogberry Aphid Nasonovia cynosbati columbia county northwest oregon
Dogberry Aphid (Nasonovia cynosbati) – 0.07-0.12″. Pale green, sometimes sufficed with dark green or red. Found on currents, piggyback plant, and fringecups. (photo © Influential Points)
Hazel Aphid Myzocallis coryli columbia county northwest oregon
Hazel Aphid (Myzocallis coryli) 0.05″-0.09″. Pale yellow, sometimes to the point of almost white, and covered in tiny hairs. Found on the leaves of hazel. (photo © Sandy Rae)
Wild Legume Aphid Macrosiphum creelii wild legumes vetches peavines columbia county northwest oregon
Wild Legume Aphid (Macrosiphum creelii) 0.09″-0.16″. A large pale green to yellow aphid with long slender spikes. Found on wild legumes such as vetches and peavines. (photo © Andy Jensen)
Dock Aphid Aphis rumicis docks sorrels rhubarb columbia county northwest oregon
Dock Aphid (Aphis rumicis) – To 0.11″. Dark greenish-brown to dull black with spines in back. Found on docks and sorrels, sometimes rhubarb. (photo © Felix Riegel)
California Lilac Aphid Aphis ceanothi columbia county northwest oregon
California Lilac Aphid (Aphis ceanothi) – To 0.09″. Reddish to brown with black end that has two spikes protruding from it. Found on California Lilacs. (photo © dlbowls)
Pearly Everlasting Aphid Uroleucon russellae cudweed columbia county northwest oregon
Pearly Everlasting Aphid (Uroleucon russellae) – To 0.13″. Rust-colored with bronzy-black. Has extremely long legs. Found on pearly everlasting and cudweed. (photo © Influential Points)
Northwest Saxifrage Aphid Macrosiphum tolmiea piggyback fringecups bishop's cups  columbia county northwest oregon
Northwest Saxifrage Aphid (Macrosiphum tolmiea) 0.12″. A bright green aphid with dark spikes. Found in wet forests on small plants including piggyback plants, fringecups, and bishop’s caps. (photo © Andy Jensen)
Wild Legume Aphid Macrosiphum creelii columbia county northwest oregon
Wild Legume Aphid (Macrosiphum creelii) 0.09″-0.16″. A large pale green to yellow aphid with long slender spikes. Found on wild legumes such as vetches and peavines. (photo © Andy Jensen)
Fennel Aphid Hyadaphis foeniculi honeysuckle wild carrots celery parsnip columbia county northwest oregon
Fennel Aphid (Hyadaphis foeniculi) – 0.05″-0.1″. Grayish-green (sometimes reddish-brown areas) with dark antennae, legs, and spikes. Moves from honeysuckle to wild carrots, celery, and parsnip. Introduced from central Asia. (photo © Influential Points)
Wayfaring Tree-Sedge Aphid Ceruraphis eriophori viburnum sedges columbia county northwest oregon
Wayfaring Tree-Sedge Aphid (Ceruraphis eriophori) – 0.1″-0.12″. Reddish-violet when small, deep black in larger form. Moves between viburnum and various sedges. (photo © Influential Points)
Chenopodium Aphid Hayhurstia atriplicis orache goosefoot columbia county northwest oregon
Chenopodium Aphid (Hayhurstia atriplicis) – 0.06″-0.12″. Green with white wax powder, short yellow spikes. Found on orache and goosefoot, rolling leaves into pseudogalls. Introduced from Europe. (photo © ðejay (Orkney))
Broom Aphid Aphis cytisorum sarothamni scotch scottish broom columbia county oregon
Broom Aphid (Aphis cytisorum sarothamni) – To 0.1″. Very dark green, with grayish wax giving the body a gray or black appearance. Found on Scotch Broom. Introduced from Europe. (photo © Jan Grathwohl)
Cocksfoot Aphid Hyalopteroides humilis cocksfoot grass columbia county northwest oregon
Cocksfoot Aphid (Hyalopteroides humilis) – Pale yellowish-green with very short spikes. Elongate body. Found on the midline of cocksfoot grass. Introduced from Europe. (photo © Influential Points)
Common Dogwood-grass Aphid Anoecia corni columbia county oregon
Common Dogwood-Grass Aphid (Anoecia corni) – To 0.12″. Adults are black, have clear wings with a small black dot. Moves between dogwood and the roots of grasses. (photo © Felix Riegel)
English Grain Aphid Sitobion avenae grasses columbia county oregon
English Grain Aphid (Sitobion avenae) – To 0.13″. Can be yellowish-green or reddish-brown, both forms with yellow legs. Found on many grains and grasses. Introduced from Europe. (photo © Jesse Rorabough)
American Grass-leaf Aphid Utamphorophora humboldti ninebark columbia county northwest oregon
American Grass-leaf Aphid (Utamphorophora humboldti) – To 0.1″. Apple-green with pale green stripe in the middle border in darker green. Moves between ninebark and the leaves of sedges/grasses. (photo © Influential Points)
Buckthorn-Fern Aphid Macrosiphum rhamni columbia county northwest oregon
Buckthorn-Fern Aphid (Macrosiphum rhamni) – 0.07″-0.1″. Pale yellow to yellowish-green, with a spot of red pigment under the surface in the middle. Moves between buckthorn and ferns. (photo © Andy Jensen)
Ocean Spray-Fern Aphid Macrosiphum walkeri columbia county northwest oregon
Ocean Spray-Fern Aphid (Macrosiphum walkeri) – 0.07″-0.13″. Yellowish-green to green, sometimes with red dots. Moves from ferns to ocean spray and related shrubs. (photo © Andy Jensen)
Ivy Aphid Aphis hederae english ivy spikenard schefflera columbia county northwest oregon
Ivy Aphid (Aphis hederae) – To 0.1″. Dark brown to dull black with small spikes in back. Primarily found on English Ivy as well as spikenard and schefflera. (photo © Gilles San Martin)

Spruce Aphids (Adelgidae)

“Spruce Aphids”, also known as “Pine Aphids”, differ from true aphids in lacking cornicles or cauda sticking out the back of the body. They feed on the needles and twigs of conifers like spruce or pines. Because at different life stages they have varying appearance and may be covered by a gall or waxy excretion, Spruce Aphids are often ID’d by their effect on plants (drained needles and galls on branches) rather than by seeing the bug itself.

Douglas Fir Adelgid Adelges cooleyi columbia county northwest oregon
Douglas Fir Adelgid (Adelges cooleyi) – To 0.1″. Dark brownish, often with waxy cotton covering. Sucks juice from Douglas Fir needles and forms galls on spruce twigs. Also known as “Cooley Spruce Gall Adelgid”. (photo © Noah Strycker)

Pineapple-gall Adelgid Adelges abietis aphid gall columbia county northwest oregon norway spruce Picea abies
Pineapple-gall Adelgid (Adelges abietis) – Bugs themselves are yellowish-brown but usually identified by the pineapple-like galls they form on Norway and Sitka Spruce. Introduced from Europe. (photo © Robby Deans)
Hemlock Wooly Adelgid Adelges tsugae aphid columbia county northwest oregon western hemlock
Hemlock Wooly Adelgid (Adelges tsugae) – To 0.06″. Reddish-purple to purple-black, often with waxy cotton covering. Feed on new stem and needle growth of hemlock. Possibly introduced from Japan. (photo © thylacine)

Balsam Woolly Adelgid Adelges piceae aphid northwest oregon columbia county fir
Balsam Woolly Adelgid (Adelges piceae) – To 0.04″. Purple to black, often with waxy cotton covering. Found on trunk or branch nodes (not new growth) of true firs. Introduced from Europe and a major pest. (photo © Jeremy Nielsen)

Balsam Twig Adelgid Mindarus abietinus aphid columbia county northwest oregon fir spruce
Balsam Twig Adelgid (Mindarus abietinus) – To 0.1″. Yellowish-green, often with waxy cotton covering. Found on new stem growth of true firs, white spruce and blue spruce. Introduced from Europe. (photo © InfluentialPoints.com)
Green Spruce Adelgid Elatobium abietinum aphid columbia county oregon sitka spruce
Green Spruce Adelgid (Elatobium abietinum) – To 0.08″. Green to yellowish-green in color. Feeds the needles on Sitka Spruce and ornamental spruces, sometimes fir. Introduced from Europe. (photo © Matt Bowser)
Pine Bark Adelgid Pineus strobi aphid columbia county northwest oregon eastern white pine
Pine Bark Adelgid (Pineus strobi) – To 0.04″. Dark red to purplish and often covered in cottony wax. Found on branches and trunk of Eastern White and other pines. Introduced from the eastern US. (photo © Cara Coulter)

Giant Douglas Fir Aphid Cinara pseudotsugae columbia county northwest oregon
Douglas Fir Aphid (Cinara pseudotsugae) – 0.1″-0.15″. Amber to brown, sometimes tinged in green or marked with black. Found on the end of shoots and branches of Douglas Fir. (photo © Chris Brant)
Bow-legged Fir Aphid Cinara curvipes columbia county northwest oregon
Bow-legged Fir Aphid (Cinara curvipes) – 0.14″-0.23″. Gray-black with stout black cones. Sometimes wax powder coating. Found on the trunk and branches of true firs and cedar. (photo © Influential Points)
Grey Waxy Pine Needle Aphid Schizolachnus pineti columbia county northwest oregon
Waxy Gray Pine-leaf Aphid (Schizolachnus pineti) – To 0.1″, smaller than Cinara sp. Brown to grayish-green with waxy coating. Found on the needles of pine trees. Introduced from Europe. (photo © Joe Holt)

Scale Insects (Coccoidea)

Also called “mealy bugs”, the females of this species are soft limbless bugs that hide under a protective scale on their plant host. They often remain unnoticed until they produce a large eggsac behind or above their actual bodies. Males on the other hand are tiny winged fly-like bugs that can travel between the plants to fertilize the females. Some species have a mutualistic relationship with ants. Identification is often difficult and depends on identifying the host plant.

Pine Needle Scale Chionaspis pinifoliae bug columbia county northwest oregon
Pine Needle Scale (Chionaspis pinifoliae) – 0.3″. Light reddish-brown body with teardrop-shaped white eggsac. Feeds on pine and occasionally hemlock, spruce, or Douglas-fir, typically on curved interior of needles. (photo © Mews)
Black Pineleaf Scale Dynaspidiotus californica columbia county northwest oregon
Black Pineleaf Scale (Dynaspidiotus californica) – 0.08″. Tiny conical scales are brown to blackish with pale edges. Found on the needles of pine, hemlock, spruce and Douglas-fir. (Whitney Cranshaw, Colorado State University)
Cottony Camellia Scale Pulvinaria floccifera columbia county northwest oregon
Cottony Camellia Scale (Pulvinaria floccifera) – 0.25″. Small brown body with long oval cottony egg sac that extends behind it. Found on yew, camellia, ivy, rhododendron and other woody plants. (photo © Jesse Rorabaugh)
Cottony Maple Scale Pulvinaria innumerabilis columbia county northwest oregon
Cottony Maple Scale (Pulvinaria innumerabilis) – 0.13″. A flat brown insect with a rather tall cottony white egg sac. Found on the branches of maple and other woody stems. (photo © Jason Dombroskie)
Cottony Maple Leaf Scale Pulvinaria acericola columbia county northwest oregon
Cottony Maple Leaf Scale (Pulvinaria acericola) – to 0.16″. Brown body with yellow-brown ridge and a cottony white egg sac up to 3x longer than body. Found on the underside of leaves, usually maple or dogwood. (photo © Susan Hewitt)
Apple Mealybug (Phenacoccus aceris) – A brown or red oval body with waxy white on top. Eggcase is long and oval. Found on apple and other fruit trees as well as maple. (photo © Beatriz Moisset)
Apple Mussel Scale (Lepidosaphes ulmi) – To 0.13″. Brown or gray, elongated and slightly curved scale with hint of ribbing. Found on branches, twigs, and fruit of broadleaf deciduous plants and trees. (photo © Melissa Hutchison)
European Fruit Scale Parthenolecanium corni columbia county oregon
European Fruit Scale (Parthenolecanium corni) – To 0.4″. Brown dome-shaped scale. Found on the wood of elm, plum, apricot, cherry, and other deciduous trees. Introduced from Europe. (photo © Oliver K. Reichl)
Oak Lecanium Scale Parthenolecanium quercifex columbia county oregon
Oak Lecanium Scale (Parthenolecanium quercifex) – To 0.25″. Shape is a bulbous brown dome. Found on twigs of oak and sometimes sycamore or hickory. (photo © hausbaun)
European Elm Scale Eriococcus spurius columbia county oregon
European Elm Scale (Eriococcus spurius) – Flat and oval, gray to brown with strong ribbing and waxy white exterior. Found on elm. Introduced from Europe. (photo © Jesse Rorabaugh)
Azalea Bark Scale (Eriococcus azaleae) – To 0.13″. Reddish-purple, typically covered with white cottony wax. Oval with imprecise borders. Found on azalea, rhododendron, and blueberries. (US Collection of Scale Insect Photographs)
Brown Soft Scale (Coccus hesperidum) – 0.12-0.2″. Flat, yellowish-brown with brown speckling or patterned lines, darkening to fully brown with age. Found on numerous hosts. (photo © James Bailey)
Long-tailed Mealybug Pseudococcus longispinus columbia county oregon
Long-tailed Mealybug (Pseudococcus longispinus) – To 0.16″. Waxy white oval, surrounded by filaments with two especially long “tails”. Found on ornamental and greenhouse plants. (photo © jbarclay)
Fern Scale Pinnaspis aspidistrae columbia county oregon
Fern Scale (Pinnaspis aspidistrae) – To 0.1″. Females brown with lighter edges and slightly curved, males straight and whitish. Found in greenhouse on ficus, hibiscus, citrus, magnolia, liriope, and acacia. (photo © John A. Davidson)
Euonymus Scale Unaspis euonymi columbia county oregon
Euonymus Scale (Unaspis euonymi) – To 0.1″. Dark brown mussel-shaped females and white elongated males. Found on leaves and stems of Euonymus and other ornamental plants. Introduced. (photo © Sequoia Wrens)

Thrips (Thysanoptera)

Extremely small, slender, soft-bodied bugs, often with thin fringed wings that they rarely use. Have sucking mouthparts that most species use to suck plant juices, though a few are predators. Larva are often brightly colored while adults are drab and dark. Thrips are difficult to find information on – there are dozens if not hundreds of species in oregon, but only a few of the most well-known ones are covereed here.

Greenhouse Thrips Heliothrips haemorrhoidalis columbia county northwest oregon
Greenhouse Thrips (Heliothrips haemorrhoidalis) – 0.05″-0.07″. Yellowish/whitish larvae, black adults with pale legs and wings. Found on citrus and other greenhouse plants. Introduced from South America. (photo © Jesse Rorabaugh)
Common Banded Thrips Aeolothrips fasciatus columbia county northwest oregon
Common Banded Thrips (Aeolothrips fasciatus) – To 0.1″. Dark brown body and distinct black-and-white banded wings. Found on flowers where it hunts the larvae of other thrips. Introduced from Europe. (photo © Jesse Rorabaugh)
Rear-bordered Banded Thrips Aeolothrips kuwanaii columbia county northwest oregon
Rear-bordered Banded Thrips (Aeolothrips kuwanaii) – Dark brown body, white wings with dark margin on rear (middle when folded). Found on flowering shrubs where it hunts the larvae of other thrips. (photo © James Bailey)
Western Flower Thrips Frankliniella occidentalis columbia county northwest oregon
Western Flower Thrips (Frankliniella occidentalis) – 0.04″-0.06″. Yellowish-white to brown with narrow wings. Feeds on numerous flowers, crops, and fruit trees of many types. (photo © Jesse Rorabaugh)
Pear Thrips Taeniothrips inconsequens
Pear Thrips (Taeniothrips inconsequens) – 0.05″-0.06″. Brown body, narrow wings brown in front and pale behind. Feeds on maples and fruit trees. Introduced from Europe. (photo © Pennsylvania DCNR, bugwood.org)

Barklice and Booklice (Psocoptera)

Considered the most primitive of all true bugs, barklice over 250 million years old have been found in the fossil record. They are very small winged bugs (though many drop their wings) with amusingly bulbous eyes. In nature they feed on fungi and algae on trees, though some have become stored grain pests or enjoy the paste on book bindings. They are a close relative of parasitic lice.

Kellogg's Scaly-winged Barklouse barkfly Pteroxanium kelloggi
Kellogg’s Scaly-winged Barklouse (Pteroxanium kelloggi) – to 0.1″. Brownish haired body with dark brown bars, often white speckling. With or without wings. Found in leaf litter as well as on fence posts and tree trunks. (photo © K Schneider)
Mottled Stout Barklouse Peripsocus subfasciatus columbia county northwest oregon
Mottled Stout Barklouse (Peripsocus subfasciatus) – To 0.15″. Tan to dark brown with smoky wings mottled with dark sections. Found on trees and in leaf litter. (photo © Harsi Parker)
Shaggy Barklouse Teliapsocus conterminus columbia county northwest oregon
Ink-drop Shaggy Barklouse (Teliapsocus conterminus) – To 0.3″. White, grayish, or yellowish with dark ribbing on abdomen and inky black dots on thorax. Fine hairs on front of forewing. Found on trees including birch. (photo © Seymore Gulls)
Brigg's Flat-winged Barklouse Ectopsocus briggsi columbia county northwest oregon
Brigg’s Flat-winged Barklouse (Ectopsocus briggsi) – to 0.08″. Body brownish-orange to brown, head broad, spotted wings broad and held horizontal. Found on dead leaves outdoors or stored food indoors. (photo © Alexis)
California Flat-winged Barklouse Ectopsocus californicus columbia county northwest oregon
California Flat-winged Barklouse (Ectopsocus californicus) – to 0.08″. Similar to Brigg’s with flat horizontal wings, but has distinct dark clypeus (protrusion between eyes). Found on tree leaves. (photo © Rebecca Marshall)
Clear Lash-faced Booklouse Trichopsocus clarus columbia county northwest oregon
Clear Lash-faced Booklouse (Trichopsocus clarus) – to 0.1″. Tan with green eyes, sometimes white spotting on abdomen. Wings clear with dark highlights. Found on tree leaves. Introduced from Europe. (photo © Seymore Gulls)
Intricate Lizard Barklouse Valenzuela perplexus columbia county northwest oregon
Intricate Lizard Barklouse (Valenzuela perplexus) – To 0.1″. Tan or orangish-brown with clear wings and relatively small head. Usually found on pine boughs, sometimes on hardwoods. (photo © Arthur MacMillan)
Yellow Lizard Barklouse Valenzuela flavidus columbia county northwest oregon
Yellow Lizard Barklouse (Valenzuela flavidus) – 0.08″-0.1″. Yellow or yellowish-orange, with some dark markings on top of thorax. Found in broad-leafed trees in forest, feeding on the fungus on leaves. (photo © kristobal22)
Two-striped Barklouse Amphigerontia bifasciata columbia county northwest oregon
Two-striped Barklouse (Amphigerontia bifasciata) – to 0.1″. Gray to brown with two dark stripes on abdomen, characteristic dark spot on lower rear of each wing. Found in both mountins and lowlands. (photo © Jesse Rorabaugh)
Fair-phallus Damp Barklouse Propsocus pulchripennis columbia county northwest oregon
Fair-phallus Damp Barklouse (Propsocus pulchripennis) – 0.1″. A stout dark barklouse, with off-setting clear and smoky sections on the wings. Found in leaf litter and under objects. Introduced from Australia. (photo © K Schneider)
Dark-headed Damp Barklouse Elipsocus hyalinus columbia county northwest oregon
Dark-headed Damp Barklouse (Elipsocus hyalinus) – 0.1″-0.14″. Dark head and thorax, dark bands on abdomen, unique veins on wings. Found on leaves of trees. Introduced from Europe. (photo © K Schneider)
F-winged Barklouse Graphopsocus cruciatus columbia county northwest oregon
F-winged Barklouse (Graphopsocus cruciatus) – to 0.1″. Five dark marks on front half of wing and a lighter “F” on second half. Found on leaves of trees and shrubs. Introduced from Eurasia. (photo © Seymore Gulls)
Reticulate-winged Booklouse Lepinotus reticulatus columbia county northwest oregon
Reticulate-winged Booklouse (Lepinotus reticulatus) – to 0.05″. Brown with large bulbous abdomen. With or without wings. Found in leaf litter, old wood, and stored grain, off of which it eats mold and bacteria. (photo © Elva Paulson)
House Psocid Liposcelis bostrychophila columbia county northwest oregon
House Psocid (Liposcelis bostrychophila) – 0.04″. Small, tan, and wingless with small eyes. In nature is found in leaf litter and under bark. A major pest of stored grains, also feeds on mold, dead insects, and insect eggs. (photo © Alexis)

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