If you don't know the exact name of a pest, try the main Invertebrates menu. Find beneficial insects in the Natural Enemies Gallery.
This list can be sorted different ways: just click on the heading(s) you want to use.
| Common name | Scientific name | Family | Order |
|---|---|---|---|
| Acacia psyllid | Acizzia uncatoides | Psyllidae | Hemiptera |
| Acorn moth | Valentinia glandulella | Coleophoridae | Lepidoptera |
| Adelgid | Adelges sp. | Adelgidae | Hemiptera |
| Adelgid | Pineus sp. | Adelgidae | Hemiptera |
| American cockroach | Periplaneta americana | Blatellidae | Orthoptera |
| American plum borer | Euzophera semifuneralis | Pyralidae | Lepidoptera |
| Amorbia | Amorbia cuneana | Tortricidae | Lepidoptera |
| Ant | various spp. | various | Hymenoptera |
| Ant, Argentine | Linepithema humile | Formicidae | Hymenoptera |
| Ant, Carpenter | Camponotus sp. | Formicidae | Hymenoptera |
| Ant, Odorous house | Tapinoma sessile | Formicidae | Hymenoptera |
| Ant, Pavement | Tetramorium caespitum | Formicidae | Hymenoptera |
| Ant, Pharaoh | Monomorium pharaonis | Formicidae | Hymenoptera |
| Ant, Red imported fire | Solenopsis invicta | Formicidae | Hymenoptera |
| Ant, Southern fire | Solenopsis xyloni | Formicidae | Hymenoptera |
| Ant, Thief | Solenopsis molesta | Formicidae | Hymenoptera |
| Ant, Velvety tree | Liometopum occidentale | Formicidae | Hymenoptera |
| Aphid | various spp. | Aphididae | Hemiptera |
| Aphid, Gall | Pemphigius sp. | Aphididae | Hemiptera |
| Aphid, Gall | Tamalia coweni | Aphididae | Hemiptera |
| Aphid, Woolly apple | Eriosoma lanigerum | Aphididae | Hemiptera |
| Aphid, Woolly hackberry | Shivaphis celti | Aphididae | Hemiptera |
| Apple maggot | Rhagoletis pomonella | Tephritidae | Diptera |
| Apple pandemis leafroller | Pandemis pyrusana | Tortricidae | Lepidoptera |
| Argentine ant | Linepithema humile | Formicidae | Hymenoptera |
| Armyworm | Spodoptera sp. | Noctuidae | Lepidoptera |
| Armyworm and cutworm (lawns) | various spp. | Noctuidae | Lepidoptera |
| Artichoke plume moth | Platyptilia carduidactyla | Pterophoridae | Lepidoptera |
| Ash Borer | Podosesia syringae | Sesiidae | Lepidoptera |
| Asian citrus psyllid | Diaphorina citri | Psyllidae | Hemiptera |
| Asian longhorned beetle | Anoplophora glabripennis | Cerambycidae | Coleoptera |
| Asparagus beetle | Crioceris sp. | Chrysomelidae | Coleoptera |
| Ataenius, Black turfgrass | Ataenius spretulus | Scarabaeidae | Coleoptera |
| Avocado brown mite | Oligonychus punicae | Tetranychidae | Acari |
| Avocado lace bug | Pseudacysta perseae | Tingidae | Hemiptera |
| Avocado thrips | Scirtothrips perseae | Thripidae | Thysanoptera |
| Baccharis gall fly | Rhopalomyia californica | Cecidomyiidae | Diptera |
| Bagrada bug | Bagrada hilaris | Pentatomidae | Hemiptera |
| Banana moth | Opogona sacchari | Tineidae | Lepidoptera |
| Banded slug | Lehmannia poirieri | Limacidae | Stylommatophora |
| Bark beetle | various spp. | various | Coleoptera |
| Bean thrips | Caliothrips fasciatus | Thripidae | Thysanoptera |
| Bean weevil | various spp. | Curculionidae | Coleoptera |
| Bed bug | Cimex lectularius | Cimicidae | Hemiptera |
| Bee stings | various spp. | Apidae | Hymenoptera |
| Bee swarms | Apis sp. | Apidae | Hymenoptera |
| Bee, Carpenter | Xylocopa sp. | Apidae | Hymenoptera |
| Bee, Leafcutting | Megachile sp. | Megachilidae | Hymenoptera |
| Beetle, Asian longhorned | Anoplophora glabripennis | Cerambycidae | Coleoptera |
| Beetle, Asparagus | Crioceris sp. | Chrysomelidae | Coleoptera |
| Beetle, Bark | various spp. | various | Coleoptera |
| Beetle, California willow leaf | Plagiodera californica | Chrysomelidae | Coleoptera |
| Beetle, Carpet | Anthrenus sp. | Dermestidae | Coleoptera |
| Beetle, Carpet | Attagenus unicolor | Dermestidae | Coleoptera |
| Beetle, Carrot | Tomarus (=Ligyrus) gibbosus | Scarabaeidae | Coleoptera |
| Beetle, Cigarette | Lasioderma serricorne | Anobiidae | Coleoptera |
| Beetle, Confused flour | Tribolium confusum | Tenebrionidae | Coleoptera |
| Beetle, Cucumber | various spp. | Chrysomelidae | Coleoptera |
| Beetle, Darkling | various spp. | Tenebrionidae | Coleoptera |
| Beetle, Dichondra flea | Chaetocnema repens | Chrysomelidae | Coleoptera |
| Beetle, Driedfruit | Carpophilus sp. | Nitidulidae | Coleoptera |
| Beetle, Drugstore | Stegobium paniceum | Anobiidae | Coleoptera |
| Beetle, Elm leaf | Xanthogaleruca (=Pyrrhalta) luteola | Chrysomelidae | Coleoptera |
| Beetle, Eucalyptus snout | Gonipterus scutellatus | Curculionidae | Coleoptera |
| Beetle, Eucalyptus tortoise | Chrysophtharta m-fusca | Chrysomelidae | Coleoptera |
| Beetle, Eucalyptus tortoise | Trachymela sloanei | Chrysomelidae | Coleoptera |
| Beetle, Flea | various spp. | Chrysomelidae | Coleoptera |
| Beetle, Fuller rose | Naupactus (=Asynonychus) godmani | Curculionidae | Coleoptera |
| Beetle, Grape bud | Glyptoscelis squamulata | Chrysomelidae | Coleoptera |
| Beetle, Green fruit | Cotinis mutabilis | Scarabaeidae | Coleoptera |
| Beetle, Hoplia | Hoplia callipyge | Scarabaeidae | Coleoptera |
| Beetle, Klamathweed | Chrysolina quadrigemina | Chrysomelidae | Coleoptera |
| Beetle, Red flour | Tribolium castaneum | Tenebrionidae | Coleoptera |
| Beetle, Sap | Carpophilus sp. | Nitidulidae | Coleoptera |
| Beetle, Sawtoothed grain | Oryzaephilus surinamensis | Silvanidae | Coleoptera |
| Beetle, Tumbling flower | Mordella spp. | Mordellidae | Coleoptera |
| Beetle, Twig | Pithyophorus spp. | Curculionidae | Coleoptera |
| Beetle, Walnut twig | Pityophthorus juglandis | Curculionidae | Coleoptera |
| Beetle, Warehouse | Trogoderma variabile | Bostrichidae | Coleoptera |
| Beetle, wood boring in homes | various spp. | various | Coleoptera |
| Bermudagrass mite | Eriophyes cynodoniensis | Eriophyidae | Acari |
| Billbug | Sphenophorus sp. | Curculionidae | Coleoptera |
| Black scale | Saissetia oleae | Coccidae | Hemiptera |
| Black turfgrass ataenius | Ataenius spretulus | Scarabaeidae | Coleoptera |
| Black vine weevil | Otiorhynchus sulcatus | Curculionidae | Coleoptera |
| Black widow spider | Latrodectus sp. | Theridiidae | Araneae |
| Blister mite on ornamentals | various spp. | Eriophyidae | Acari |
| Borer, American plum | Euzophera semifuneralis | Pyralidae | Lepidoptera |
| Borer, Ash | Podosesia syringae | Sesiidae | Lepidoptera |
| Borer, Branch & twig (grape) | Melalgus (=Polycaon) confertus | Bostrichidae | Coleoptera |
| Borer, Eucalyptus longhorned | Phoracantha sp. | Cerambycidae | Coleoptera |
| Borer, Flatheaded | various spp. | Buprestidae | Coleoptera |
| Borer, Goldspotted oak | Agrilus auroguttatus | Buprestidae | Coleoptera |
| Borer, Lead cable | Scobicia declivis | Bostrichidae | Coleoptera |
| Borer, Longhorned | various spp. | Cerambycidae | Coleoptera |
| Borer, Lycaenid pod | various spp. | Lycaenidae | Lepidoptera |
| Borer, Pacific flatheaded | Chrysobothris malis | Buprestidae | Coleoptera |
| Borer, Peach twig | Anarsia lineatella | Gelechiidae | Lepidoptera |
| Borer, Peachtree | Synanthedon exitiosa | Sesiidae | Lepidoptera |
| Borer, Poplar and willow | Cryptorhynchus lapathi | Curculionidae | Coleoptera |
| Borer, Raspberry crown | Pennisetia marginata | Sesiidae | Lepidoptera |
| Borer, Roundheaded | various spp. | Cerambycidae | Coleoptera |
| Borer, Shothole | Scolytus rugulosus | Curculionidae | Coleoptera |
| Borer, Sycamore | Synanthedon resplendens | Sesiidae | Lepidoptera |
| Bougainvillea looper | Disclisioprocta stellata | Geometridae | Lepidoptera |
| Boxelder bug | Boisea rubrolineata | Rhopalidae | Hemiptera |
| Boxwood leafminer | Monarthropalpus flavus | Cecidomyiidae | Diptera |
| Branch & twig borer (grape) | Melalgus (=Polycaon) confertus | Bostrichidae | Coleoptera |
| Branch borer (trees & shrubs) | various spp. | Bostrichidae | Coleoptera |
| Bristly roseslug | Cladius difformis | Tenthredinidae | Hymenoptera |
| Broad mite | Polyphagotarsonemus latus | Tarsonemidae | Acari |
| Brown apricot scale | Parthenolecanium corni | Coccidae | Hemiptera |
| Brown garden snail | Cornu (=Helix) aspersum | Helicidae | Stylommatophora |
| Brown marmorated stink bug | Halyomorpha halys | Pentatomidae | Hemiptera |
| Brown mite | Bryobia rubrioculus | Tetranychidae | Acari |
| Brown recluse spider (& others) | Loxosceles sp. | Sicariidae | Araneae |
| Brown soft scale | Coccus hesperidum | Coccidae | Hemiptera |
| Brownbanded cockroach | Supella longipalpa | Blatellidae | Orthoptera |
| Buffalo treehopper | Stictocephala bisonia | Cicadellidae | Hemiptera |
| Bug (True bugs) | various spp. | various | Hemiptera |
| Bug, Bagrada | Bagrada hilaris | Pentatomidae | Hemiptera |
| Bug, Bed | Cimex lectularius | Cimicidae | Hemiptera |
| Bug, Boxelder | Boisea rubrolineata | Rhopalidae | Hemiptera |
| Bug, Brown marmorated stink | Halyomorpha halys | Pentatomidae | Hemiptera |
| Bug, Conenose | Triatoma protracta | Reduviidae | Hemiptera |
| Bug, False chinch | Nysius raphanus | Lygaeidae | Hemiptera |
| Bug, Harlequin | Murgantia histrionica | Pentatomidae | Hemiptera |
| Bug, Lygus | Lygus hesperus | Miridae | Hemiptera |
| Bug, Southern Chinch | Blissus insularis | Blissidae | Hemiptera |
| Bug, Squash | Anasa tristis | Coreidae | Hemiptera |
| Bug, Stink | various spp. | Pentatomidae | Hemiptera |
| Bulb mite | various spp. | Acaridae | Acari |
| Cabbage maggot | Delia radicum | Anthomyiidae | Diptera |
| Cabbageworm, Imported | Pieris rapae | Pieridae | Lepidoptera |
| Calico scale | Eulecanium cerasorum | Coccidae | Hemiptera |
| California oakworm | Phryganidia californica | Dioptidae | Lepidoptera |
| California pear sawfly | Pristiphora abbreviata | Tenthredinidae | Hymenoptera |
| California red scale | Aonidiella aurantii | Diaspididae | Hemiptera |
| California willow leaf beetle | Plagiodera californica | Chrysomelidae | Coleoptera |
| Cankerworm, Fall | Alsophila pometaria | Geometridae | Lepidoptera |
| Carpenter ant | Camponotus sp. | Formicidae | Hymenoptera |
| Carpenter bee | Xylocopa sp. | Apidae | Hymenoptera |
| Carpenterworm | Prionoxystus robiniae | Cossidae | Lepidoptera |
| Carpet beetle | Anthrenus sp. | Dermestidae | Coleoptera |
| Carpet beetle | Attagenus unicolor | Dermestidae | Coleoptera |
| Carrot beetle | Tomarus (=Ligyrus) gibbosus | Scarabaeidae | Coleoptera |
| Carrot rust fly | Psila rosae | Psilidae | Diptera |
| Casemaker | Bucculatrix spp. | Bucculatricidae | Lepidoptera |
| Ceanothus stem gall moth | Periploca ceanothiella | Cosmopterigidae | Lepidoptera |
| Centipedes | various spp. | various | various |
| Chafer, Masked | Cyclocephala sp. | Scarabaeidae | Coleoptera |
| Cherry leafhopper | Fieberiella florii | Cicadellidae | Hemiptera |
| Cherry slug | Caliroa cerasi | Tenthredinidae | Hymenoptera |
| Chinch bug, False | Nysius raphanus | Lygaeidae | Hemiptera |
| Chinch bug, Southern | Blissus insularis | Blissidae | Hemiptera |
| Cigarette beetle | Lasioderma serricorne | Anobiidae | Coleoptera |
| Citricola scale | Coccus pseudomagnoliarum | Coccidae | Hemiptera |
| Citrus bud mite | Eriophyes sheldoni | Eriophyidae | Acari |
| Citrus cutworm | Egira (=Xylomyges) curialis | Noctuidae | Lepidoptera |
| Citrus leafminer | Phyllocnistis citrella | Gracillariidae | Lepidoptera |
| Citrus mealybug | Planococcus citri | Pseudococcidae | Hemiptera |
| Citrus red mite | Panonychus citri | Tetranychidae | Acari |
| Citrus root weevil | Diaprepes abbreviatus | Curculionidae | Coleoptera |
| Citrus rust mite (Silver mite) | Phyllocoptruta oleivora | Eriophyidae | Acari |
| Citrus thrips | Scirtothrips citri | Thripidae | Thysanoptera |
| Clearwing moth | various spp. | Sesiidae | Hemiptera |
| Climbing cutworm | various spp. | various | Lepidoptera |
| Clothes moth, casemaking | Tinea pellionella | Tineidae | Lepidoptera |
| Clothes moth, webbing | Tineola bisselliella | Tineidae | Lepidoptera |
| Cockroach | various spp. | Blatellidae | Orthoptera |
| Cockroach, American | Periplaneta americana | Blatellidae | Orthoptera |
| Cockroach, Brownbanded | Supella longipalpa | Blatellidae | Orthoptera |
| Cockroach, Field | Blattella vaga | Blatellidae | Orthoptera |
| Cockroach, German | Blattella germanica | Blatellidae | Orthoptera |
| Cockroach, Oriental | Blatta orientalis | Blatellidae | Orthoptera |
| Cockroach, Smokybrown | Periplaneta fuliginosa | Blatellidae | Orthoptera |
| Cockroach, Turkestan | Blatta lateralis | Blatellidae | Orthoptera |
| Codling moth | Cydia pomonella | Tortricidae | Lepidoptera |
| Conenose bug | Triatoma protracta | Reduviidae | Hemiptera |
| Confused flour beetle | Tribolium confusum | Tenebrionidae | Coleoptera |
| Conifer sawfly | Neodiprion spp. | Diprionidae | Hymenoptera |
| Corn earworm | Helicoverpa zea | Noctuidae | Lepidoptera |
| Cottony cushion scale | Icerya purchasi | Margarodidae | Hemiptera |
| Crane fly | Tipula paludosa | Tipulidae | Diptera |
| Cribrate weevil | Otiorhynchus cribricollis | Curculionidae | Coleoptera |
| Cricket | Gryllus sp. | Gryllidae | Orthoptera |
| Cricket, Jerusalem | Stenopelmatus fuscus | Stenopelmatidae | Orthoptera |
| Cuban laurel thrips | Gynaikothrips ficorum | Phlaeothripidae | Thysanoptera |
| Cucumber beetle | various spp. | Chrysomelidae | Coleoptera |
| Curculio, Rose | Rhynchites bicolor | Curculionidae | Coleoptera |
| Cutworm | various spp. | Noctuidae | Lepidoptera |
| Cutworm and armyworm, lawns | various spp. | Noctuidae | Lepidoptera |
| Cutworm on fruit | various spp. | â?¦ | Lepidoptera |
| Cutworm, Citrus | Egira (=Xylomyges) curialis | Noctuidae | Lepidoptera |
| Cutworm, Climbing | various spp. | â?¦ | Lepidoptera |
| Cutworm, Variegated | Peridroma saucia | Noctuidae | Lepidoptera |
| Cycad scale | Furchadaspis zamiae | Diaspididae | Hemiptera |
| Cyclamen mite | Phytonemus (=Steneotarsonemus) pallidus | Tarsonemidae | Acari |
| Cypress bark mealybug | Ehrhornia cupressi | Pseudococcidae | Hemiptera |
| Cypress bark moth | Cydia (=Laspeyresia) cupressana | Tortricidae | Lepidoptera |
| Cypress bark moth | Epinotia hopkinsana | Tortricidae | Lepidoptera |
| Cypress bark scale | Ehrhornia cupressi | Pseudococcidae | Hemiptera |
| Dampwood termite | Zootermopsis spp. | Termopsidae | Isoptera |
| Darkling beetle | various spp. | Tenebrionidae | Coleoptera |
| Diamondback moth | Plutella xylostella | Plutellidae | Lepidoptera |
| Diaprepes root weevil | Diaprepes abbreviatus | Curculionidae | Coleoptera |
| Dichondra flea beetle | Chaetocnema repens | Chrysomelidae | Coleoptera |
| Douglas-fir pitch moth | Synanthedon novaroensis | Sesiidae | Lepidoptera |
| Douglas-fir twig weevil | Cylindrocopturus furnissi | Curculionidae | Coleoptera |
| Drain fly | Pyschoda spp. | Pyschodidae | Diptera |
| Drain fly | Telmatoscopus spp. | Pyschodidae | Diptera |
| Driedfruit beetle | Carpophilus sp. | Nitidulidae | Coleoptera |
| Drosophila, spotted wing | Drosophila suzukii | Drosophilidae | Diptera |
| Drugstore beetle | Stegobium paniceum | Anobiidae | Coleoptera |
| Dryberry mite | Phyllocoptes gracilis | Eriophyidae | Acari |
| Drywood termite | Incisitermes minor | Kalotermitidae | Isoptera |
| Earthworm | Lumbricus terrestris | Lumbricidae | Haplotaxida |
| Earwig | Forficula auricularia | Forficulidae | Dermaptera |
| Earworm, Corn | Helicoverpa zea | Noctuidae | Lepidoptera |
| Elm leaf beetle | Xanthogaleruca (=Pyrrhalta) luteola | Chrysomelidae | Coleoptera |
| Eucalyptus longhorned borer | Phoracantha sp. | Cerambycidae | Coleoptera |
| Eucalyptus redgum lerp psyllid | Glycaspis brimblecombei | Psyllidae | Hemiptera |
| Eucalyptus snout beetle | Gonipterus scutellatus | Curculionidae | Coleoptera |
| Eucalyptus tortoise beetle | Chrysophtharta m-fusca | Chrysomelidae | Coleoptera |
| Eucalyptus tortoise beetle | Trachymela sloanei | Chrysomelidae | Coleoptera |
| Eugenia psyllid | Trioza eugeniae | Psyllidae | Hemiptera |
| Euonymus scale | Unaspis euonymi | Diaspididae | Hemiptera |
| European elm scale | Gossyparia spuria | Eriococcidae | Hemiptera |
| European fruit lecanium | Parthenolecanium corni | Coccidae | Hemiptera |
| European grapevine moth | Lobesia botrana | Tortricidae | Lepidoptera |
| European red mite | Panonychus ulmi | Tetranychidae | Acari |
| Eye gnat | Hippelates spp. | Chloropidae | Diptera |
| Eye gnat | Liohippelates spp. | Chloropidae | Diptera |
| Face fly | Musca autumnalis | Muscidae | Diptera |
| Fall cankerworm | Alsophila pometaria | Geometridae | Lepidoptera |
| Fall webworm | Hyphantria cunea | Erebidae | Lepidoptera |
| False chinch bug | Nysius raphanus | Lygaeidae | Hemiptera |
| Field cockroach | Blattella vaga | Blatellidae | Orthoptera |
| Fiery skipper | Hylephila phyleus | Hesperiidae | Lepidoptera |
| Filbert weevil | Curculio occidentis | Curculionidae | Coleoptera |
| Filbertworm | Cydia latiferreana | Tortricidae | Lepidoptera |
| Fire ant, Red imported | Solenopsis invicta | Formicidae | Hymenoptera |
| Fire ant, Southern | Solenopsis xyloni | Formicidae | Hymenoptera |
| Firebrat | Thermobia domestica | Lepismatidae | Thysanura |
| Flatheaded borer | Agrilus sp. | Buprestidae | Coleoptera |
| Flatheaded borer | Chrysobothris sp. | Buprestidae | Coleoptera |
| Flea | Ctenocephalides felis | Pulicidae | Siphonaptera |
| Flea beetle | various spp. | Chrysomelidae | Coleoptera |
| Flea beetle, Dichondra | Chaetocnema repens | Chrysomelidae | Coleoptera |
| Flies | various spp. | various | Diptera |
| Fly, Carrot rust | Psila rosae | Psilidae | Diptera |
| Fly, Crane | Tipula paludosa | Tipulidae | Diptera |
| Fly, Drain | Pyschoda spp. | Pyschodidae | Diptera |
| Fly, Drain | Telmatoscopus spp. | Pyschodidae | Diptera |
| Fly, Face | Musca autumnalis | Muscidae | Diptera |
| Fly, Fruit | Drosophila sp. | Drosophilidae | Diptera |
| Fly, Garbage | Phaenicia spp. | Calliphoridae | Diptera |
| Fly, House | Musca domestica | Muscidae | Diptera |
| Fly, Lesser bulb | Eumerus spp. | Syrphidae | Diptera |
| Fly, Little house | Fannia canicularis | Muscidae | Diptera |
| Fly, Moth | Pyschoda spp. | Pyschodidae | Diptera |
| Fly, Moth | Telmatoscopus spp. | Pyschodidae | Diptera |
| Fly, Narcissus bulb | Merodon equestris | Syrphidae | Diptera |
| Fly, Olive fruit | Bactrocera oleae | Tephritidae | Diptera |
| Fly, Shore | Scatella stagnalis | Ephydridae | Diptera |
| Fly, Stable | Stomoxys calcitrans | Muscidae | Diptera |
| Fly, Vinegar | Drosophila sp. | Drosophilidae | Diptera |
| Fly, Walnut husk | Rhagoletis completa | Tephritidae | Diptera |
| Foliage miner (woody ornamentals) | various spp. | various | Lepidoptera |
| Frosted scale | Parthenolecanium pruinosum | Coccidae | Hemiptera |
| Fruit fly | Drosophila sp. | Drosophilidae | Diptera |
| Fruit fly, Olive | Bactrocera oleae | Tephritidae | Diptera |
| Fruittree leafroller | Archips argyrospila | Tortricidae | Lepidoptera |
| Fruitworm, Green | various spp. | Noctuidae | Lepidoptera |
| Fruitworm, Tomato | Helicoverpa zea | Noctuidae | Lepidoptera |
| Fuchsia gall mite | Aculops fuchsiae | Eriophyidae | Acari |
| Fuller rose beetle | Naupactus (=Asynonychus) godmani | Curculionidae | Coleoptera |
| Fungus gnat | Bradysia spp. | Sciaridae | Diptera |
| Fungus gnat | Orfelia spp. | Sciaridae | Diptera |
| Gall and blister mite | various spp. | Eriophyidae | Acari |
| Gall and bud mite | various spp. | Eriophyidae | Acari |
| Gall aphid | Pemphigius sp. | Aphididae | Hemiptera |
| Gall aphid | Tamalia coweni | Aphididae | Hemiptera |
| Gall fly, Baccharis | Rhopalomyia californica | Cecidomyiidae | Diptera |
| Gall maker | various spp. | various | various |
| Gall midge | various spp. | Cecidomyiidae | Diptera |
| Gall midge, Honeylocust pod | Dasineura gleditschiae | Cecidomyiidae | Diptera |
| Gall mite on ornamentals | various spp. | Eriophyidae | Acari |
| Gall moth, Ceanothus | Periploca ceanothiella | Cosmopterigidae | Lepidoptera |
| Gall wasp, Twohorned oak | Dryocosmus dubiosus | Cynipidae | Hymenoptera |
| Garbage fly | Phaenicia spp. | Calliphoridae | Diptera |
| Garden symphylan | Scutigerella immaculata | Scutigerellidae | Symphyla |
| German cockroach | Blattella germanica | Blatellidae | Orthoptera |
| Giant whitefly | Aleurodicus dugesii | Aleyrodidae | Hemiptera |
| Gilli mealybug | Ferrisia gilli | Pseudococcidae | Hemiptera |
| Glassy-winged Sharpshooter | Homalodisca vitripennis | Cicadellidae | Hemiptera |
| Gnat, Eye | Hippelates spp. | Chloropidae | Diptera |
| Gnat, Eye | Liohippelates spp. | Chloropidae | Diptera |
| Gnat, Fungus | Bradysia spp. | Sciaridae | Diptera |
| Gnat, Fungus | Orfelia spp. | Sciaridae | Diptera |
| Goldspotted oak borer | Agrilus auroguttatus | Buprestidae | Coleoptera |
| Grape bud beetle | Glyptoscelis squamulata | Chrysomelidae | Coleoptera |
| Grape erineum mite | Colomerus vitis | Eriophyidae | Acari |
| Grape leaffolder | Desmia funeralis | Crambidae | Lepidoptera |
| Grape leafhopper | Erythroneura spp. | Cicadellidae | Hemiptera |
| Grape mealybug | Pseudococcus maritimus | Pseudococcidae | Hemiptera |
| Grape phylloxera | Daktulosphaira vitifoliae | Phylloxeridae | Hemiptera |
| Grapeleaf skeletonizer, Western | Harrisina brillians | Zygaenidae | Lepidoptera |
| Grapevine moth, European | Lobesia botrana | Tortricidae | Lepidoptera |
| Grasshopper | various spp. | Acrididae | Orthoptera |
| Gray garden slug | Deroceras reticulatum | Agriolimacidae | Stylommatophora |
| Greedy scale | Hemiberlesia rapax | Diaspididae | Hemiptera |
| Green fruit beetle | Cotinis mutabilis | Scarabaeidae | Coleoptera |
| Green fruitworm | various spp. | Noctuidae | Lepidoptera |
| Green fruitworm, humped | Amphipyra pyramidoides | Noctuidae | Lepidoptera |
| Green fruitworm, speckled | Orthosia hibisci | Noctuidae | Lepidoptera |
| Green shield scale | Pulvinaria psidii | Coccidae | Hemiptera |
| Greenhouse slug | Milax gagates | Milacidae | Stylommatophora |
| Greenhouse thrips | Heliothrips haemorrhoidalis | Thripidae | Thysanoptera |
| Ground mealybug | Rhizoecus spp. | Pseudococcidae | Hemiptera |
| Grub, White | Cyclocephala sp. | Scarabaeidae | Coleoptera |
| Hackberry woolly aphid | Shivaphis celti | Aphididae | Hemiptera |
| Harlequin bug | Murgantia histrionica | Pentatomidae | Hemiptera |
| Head lice | Pediculus humanus capitis | Pediculidae | Phthiraptera |
| Hobo spider | Tegenaria agrestis | Agelenidae | Araneae |
| Honeylocust pod gall midge | Dasineura gleditschiae | Cecidomyiidae | Diptera |
| Hoplia beetle | Hoplia callipyge | Scarabaeidae | Coleoptera |
| Horntail or wood wasp | various spp. | Siricidae | Hymenoptera |
| Hornworm | Manduca sp. | Sphingidae | Lepidoptera |
| Horsehair worm | various spp. | various | Gordioida |
| House fly | Musca domestica | Muscidae | Diptera |
| Imported cabbageworm | Pieris rapae | Pieridae | Lepidoptera |
| Indian walking stick | Carausius morosus | Diapheromeridae | Phasmatodea |
| Indianmeal moth | Plodia interpunctella | Pyralidae | Lepidoptera |
| Irregular pine scale | Toumeyella pinicola | Coccidae | Hemiptera |
| Jerusalem cricket | Stenopelmatus fuscus | Stenopelmatidae | Orthoptera |
| Juniper twig girdler | Periploca nigra | Cosmopterigidae | Lepidoptera |
| Katydid | Microcentum retinerve | Tettigoniidae | Orthoptera |
| Katydid | Scudderia furcata | Tettigoniidae | Orthoptera |
| Klamathweed beetle | Chrysolina quadrigemina | Chrysomelidae | Coleoptera |
| Kuno scale | Eulecanium kunoense | Coccidae | Hemiptera |
| Lace bug | various spp. | Tingidae | Hemiptera |
| Lace bug, Avocado | Pseudacysta perseae | Tingidae | Hemiptera |
| Latania scale | Hemiberlesia lataniae | Diaspididae | Hemiptera |
| Lawn moth and sod webworm | various spp. | Crambidae | Lepidoptera |
| Lead cable borer | Scobicia declivis | Bostrichidae | Coleoptera |
| Leafcutting bee | Megachile sp. | Megachilidae | Hymenoptera |
| Leaffolder, Grape | Desmia funeralis | Crambidae | Lepidoptera |
| Leaffooted bug | Leptoglossus zonatus | Pentatomidae | Hemiptera |
| Leaffooted bug | Leptoglossus clypealis | Pentatomidae | Hemiptera |
| Leaffooted bug | Leptoglossus occidentalis | Pentatomidae | Hemiptera |
| Leafhopper, Cherry | Fieberiella florii | Cicadellidae | Hemiptera |
| Leafhopper, flowers | various spp. | Cicadellidae | Hemiptera |
| Leafhopper, Grape | Erythroneura spp. | Cicadellidae | Hemiptera |
| Leafhopper (lawns) | Deltacephalus sonorus | Cicadellidae | Hemiptera |
| Leafhopper (lawns) | Draeculacephala minerva | Cicadellidae | Hemiptera |
| Leafhopper, Mountain | Colladonus montanus | Cicadellidae | Hemiptera |
| Leafhopper (trees and shrubs) | various spp. | Cicadellidae | Hemiptera |
| Leafhopper (vegetables and fruit) | various spp. | Cicadellidae | Hemiptera |
| Leafminer, Boxwood | Monarthropalpus flavus | Cecidomyiidae | Diptera |
| Leafminer, Citrus | Phyllocnistis citrella | Gracillariidae | Lepidoptera |
| Leafminer, flowers | Liriomyza sp. | Agromyzidae | Diptera |
| Leafminer, Tentiform | Phyllonorycter sp. | Gracillariidae | Lepidoptera |
| Leafroller | various spp. | Tortricidae | Lepidoptera |
| Leafroller, Apple pandemis | Pandemis pyrusana | Tortricidae | Lepidoptera |
| Leafroller, Fruittree | Archips argyrospila | Tortricidae | Lepidoptera |
| Leafroller, Garden tortrix | Ptycholoma peritana | Tortricidae | Lepidoptera |
| Leafroller, Obliquebanded | Choristoneura rosaceana | Tortricidae | Lepidoptera |
| Leafroller, Omnivorous | Platynota stultana | Tortricidae | Lepidoptera |
| Leafroller, Strawberry | Ancylus comptana fragariae | Tortricidae | Lepidoptera |
| Lesser bulb fly | Eumerus spp. | Syrphidae | Diptera |
| Lice, Head | Pediculus humanus capitis | Pediculidae | Phthiraptera |
| Light brown apple moth | Epiphyas postvittana | Tortricidae | Lepidoptera |
| Little house fly | Fannia canicularis | Muscidae | Diptera |
| Longhorned borer | various spp. | Cerambycidae | Coleoptera |
| Longtailed mealybug | Pseudococcus longispinus | Pseudococcidae | Hemiptera |
| Looper | various spp. | various | Lepidoptera |
| Looper, Bougainvillea | Disclisioprocta stellata | Geometridae | Lepidoptera |
| Looper, Omnivorous | Sabulodes aegrotata | Geometridae | Lepidoptera |
| Lycaenid pod borer | various spp. | Lycaenidae | Lepidoptera |
| Lygus bug | Lygus hesperus | Miridae | Hemiptera |
| Maggot, Apple | Rhagoletis pomonella | Tephritidae | Diptera |
| Maggot, Cabbage | Delia radicum | Anthomyiidae | Diptera |
| Maggot, Onion | Delia antigua | Anthomyiidae | Diptera |
| Maggot, Raspberry cane | Pegomya rubivora | Anthomyiidae | Diptera |
| Maggot, Seedcorn | Delia platura | Anthomyiidae | Diptera |
| Masked chafer | Cyclocephala sp. | Scarabaeidae | Coleoptera |
| Mealybug | various spp. | Pseudococcidae | Hemiptera |
| Mealybug, citrus | Planococcus citri | Pseudococcidae | Hemiptera |
| Mealybug, Cypress bark | Ehrhornia cupressi | Pseudococcidae | Hemiptera |
| Mealybug, Gilli (Gill's) | Ferrisia gilli | Pseudococcidae | Hemiptera |
| Mealybug, Grape | Pseudococcus maritimus | Pseudococcidae | Hemiptera |
| Mealybug, Ground | Rhizoecus spp. | Pseudococcidae | Hemiptera |
| Mealybug, Longtailed | Pseudococcus longispinus | Pseudococcidae | Hemiptera |
| Mealybug, Obscure | Pseudococcus affinis | Pseudococcidae | Hemiptera |
| Midge, Gall | various spp. | Cecidomyiidae | Diptera |
| Midge, Honeylocust pod gall | Dasineura gleditschiae | Cecidomyiidae | Diptera |
| Midge, Monterey pine | Thecodiplosis piniradiatae | Cecidomyiidae | Diptera |
| Midge, Needle and twig | Contarinia sp. | Cecidomyiidae | Diptera |
| Millipede | various spp. | various | various |
| Minute cypress scale | Carulaspis minima | Diaspididae | Hemiptera |
| Mite, Avocado brown | Oligonychus punicae | Tetranychidae | Acari |
| Mite, Bermudagrass | Eriophyes cynodoniensis | Eriophyidae | Acari |
| Mite, Broad | Polyphagotarsonemus latus | Tarsonemidae | Acari |
| Mite, Brown | Bryobia rubrioculus | Tetranychidae | Acari |
| Mite, bulb | various spp. | Acaridae | Acari |
| Mite, Citrus bud | Eriophyes sheldoni | Eriophyidae | Acari |
| Mite, Citrus red | Panonychus citri | Tetranychidae | Acari |
| Mite, Citrus rust | Phyllocoptruta oleivora | Eriophyidae | Acari |
| Mite, Cyclamen | Phytonemus pallidus | Tarsonemidae | Acari |
| Mite, Dryberry | Phyllocoptes gracilis | Eriophyidae | Acari |
| Mite, European red | Panonychus ulmi | Tetranychidae | Acari |
| Mite, Fuchsia gall | Aculops fuchsiae | Eriophyidae | Acari |
| Mite, gall or blister (ornamentals) | various spp. | Eriophyidae | Acari |
| Mite, Gall or bud | various spp. | Eriophyidae | Acari |
| Mite, Grape erineum | Colomerus vitis | Eriophyidae | Acari |
| Mite, Pear rust | Epitrimerus pyri | Eriophyidae | Acari |
| Mite, Pearleaf blister | Phytoptus pyri | Phytoptidae | Acari |
| Mite, Persea | Oligonychus perseae | Tetranychidae | Acari |
| Mite, Redberry | Acalitus essigi | Eriophyidae | Acari |
| Mite, Silver | Phyllocoptruta oleivora | Eriophyidae | Acari |
| Mite, Sixspotted | Eotetranychus sexmaculatus | Tetranychidae | Acari |
| Mite, Spider | various spp. | Tetranychidae | Acari |
| Mite, Spinach crown | Rhizoglyphus sp. | Acaridae | Acari |
| Mite, Tomato russet | Aculops lycopersici | Eriophyidae | Acari |
| Mite, Wheat curl | Eriophyes tulipae | Eriophyidae | Acari |
| Monterey cypress scale | Xylococculus macrocarpae | Margarodidae | Hemiptera |
| Monterey pine bud moth | Exoteleia burkei | Gelechiidae | Lepidoptera |
| Monterey pine midge | Thecodiplosis piniradiatae | Cecidomyiidae | Diptera |
| Mosquitoes | various spp. | Culicidae | Diptera |
| Moth fly | Pyschoda spp. | Pyschodidae | Diptera |
| Moth fly | Telmatoscopus spp. | Pyschodidae | Diptera |
| Mountain leafhopper | Colladonus montanus | Cicadellidae | Hemiptera |
| Myoporum thrips | Klambothrips myopori | Phlaeothripidae | Thysanoptera |
| Narcissus bulb fly | Merodon equestris | Syrphidae | Diptera |
| Navel orangeworm | Amyelois transitella | Pyralidae | Lepidoptera |
| Needle and twig midge | Contarinia sp. | Cecidomyiidae | Diptera |
| Nematode | various spp. | various | Tylenchida |
| Nematode, Pinewood | Bursaphelenchus xylophilus | Parasitaphelenchidae | Aphelenchida |
| Oak leaf phylloxera | Phylloxera sp. | Phylloxeridae | Hemiptera |
| Oak pit scale | Asterolecanium sp. | Asterolecaniidae | Hemiptera |
| Oakworm, California | Phryganidia californica | Dioptidae | Lepidoptera |
| Obliquebanded Leafroller | Choristoneura rosaceana | Tortricidae | Lepidoptera |
| Obscure mealybug | Pseudococcus affinis | Pseudococcidae | Hemiptera |
| Obscure root weevil | Sciopithes obscurus | Curculionidae | Coleoptera |
| Obscure scale | Melanaspis obscura | Diaspididae | Hemiptera |
| Odorous house ant | Tapinoma sessile | Formicidae | Hymenoptera |
| Oleander scale | Aspidiotus nerii | Diaspididae | Hemiptera |
| Olive fruit fly | Bactrocera oleae | Tephritidae | Diptera |
| Olive psyllid | Euphyllura olivina | Psyllidae | Hemiptera |
| Olive scale | Parlatoria oleae | Diaspididae | Hemiptera |
| Omnivorous leafroller | Platynota stultana | Tortricidae | Lepidoptera |
| Omnivorous looper | Sabulodes aegrotata | Geometridae | Lepidoptera |
| Onion maggot | Delia antigua | Anthomyiidae | Diptera |
| Onion thrips | Thrips tabaci | Thripidae | Thysanoptera |
| Orange leafroller (tortrix) | Argyrotaenia citrana | Tortricidae | Lepidoptera |
| Orange tortrix (leafroller) | Argyrotaenia citrana | Tortricidae | Lepidoptera |
| Orangeworm, Navel | Amyelois transitella | Pyralidae | Lepidoptera |
| Oriental cockroach | Blatta orientalis | Blatellidae | Orthoptera |
| Oriental fruit moth | Grapholita molesta | Tortricidae | Lepidoptera |
| Oystershell scale | Lepidosaphes ulmi | Diaspididae | Hemiptera |
| Pacific flatheaded borer | Chrysobothris malis | Buprestidae | Coleoptera |
| Painted lady butterfly | Vanessa cardui | Nymphalidae | Lepidoptera |
| Pavement ant | Tetramorium caespitum | Formicidae | Hymenoptera |
| Pea leaf weevil | Sitona lineata | Curculionidae | Coleoptera |
| Pea moth | Cydia nigricana | Tortricidae | Lepidoptera |
| Pea weevil | Bruchus pisorum | Curculionidae | Coleoptera |
| Peach twig borer | Anarsia lineatella | Gelechiidae | Lepidoptera |
| Peachtree borer | Synanthedon exitiosa | Sesiidae | Lepidoptera |
| Pear psylla | Psylla pyricola | Psyllidae | Hemiptera |
| Pear rust mite | Epitrimerus pyri | Eriophyidae | Acari |
| Pear slug | Caliroa cerasi | Tenthredinidae | Hymenoptera |
| Pearleaf blister mite | Phytoptus pyri | Phytoptidae | Acari |
| Pepper weevil | Anthonomus aenotinctus | Curculionidae | Coleoptera |
| Peppertree psyllid | Calophya schini | Psyllidae | Hemiptera |
| Persea mite | Oligonychus perseae | Tetranychidae | Acari |
| Pharaoh ant | Monomorium pharaonis | Formicidae | Hymenoptera |
| Phylloxera, Grape | Daktulosphaira vitifoliae | Phylloxeridae | Hemiptera |
| Phylloxera, Oak leaf | Phylloxera sp. | Phylloxeridae | Hemiptera |
| Pillbug | various spp. | various | Isopoda |
| Pine needle weevil | Scythropus sp. | Curculionidae | Coleoptera |
| Pine tip or shoot moth | Rhyacionia sp. | Tortricidae | Lepidoptera |
| Pine weevil | Pissodes sp. | Curculionidae | Coleoptera |
| Pinewood nematode | Bursaphelenchus xylophilus | Parasitaphelenchidae | Aphelenchida |
| Pinworm, tomato | Keiferia lycopersicella | Gelechiidae | Lepidoptera |
| Pitch moth | Synanthedon spp. | Sesiidae | Lepidoptera |
| Pitch moth, Douglas-fir | Synanthedon novaroensis | Sesiidae | Lepidoptera |
| Pitch moth, Sequoia | Synanthedon sequoiae | Sesiidae | Lepidoptera |
| Poplar and willow borer | Cryptorhynchus lapathi | Curculionidae | Coleoptera |
| Potato tuberworm | Phthorimaea operculella | Gelechiidae | Lepidoptera |
| Psylla, Pear | Psylla pyricola | Psyllidae | Hemiptera |
| Psyllid | various spp. | Psyllidae | Hemiptera |
| Psyllid, Asian citrus | Diaphorina citri | Psyllidae | Hemiptera |
| Psyllid, Eucalyptus redgum lerp | Glycaspis brimblecombei | Psyllidae | Hemiptera |
| Purple scale | Lepidosaphes beckii | Diaspididae | Hemiptera |
| Raspberry cane maggot | Pegomya rubivora | Anthomyiidae | Diptera |
| Raspberry crown borer | Pennisetia marginata | Sesiidae | Lepidoptera |
| Raspberry horntail sawfly | Hartigia cressoni | Cephidae | Hymenoptera |
| Raspberry sawfly | Monophadnoides geniculatus | Tenthredinidae | Hymenoptera |
| Recluse spiders | Loxosceles sp. | Sicariidae | Araneae |
| Red flour beetle | Tribolium castaneum | Tenebrionidae | Coleoptera |
| Red imported fire ant | Solenopsis invicta | Formicidae | Hymenoptera |
| Red palm weevil | Rhynchophorus ferrugineus | Curculionidae | Coleoptera |
| Redberry mite | Acalitus essigi | Eriophyidae | Acari |
| Redhumped caterpillar | Schizura concinna | Notodontidae | Lepidoptera |
| Root weevil | Otiorhynchus cribricollis | Curculionidae | Coleoptera |
| Rose curculio | Rhynchites bicolor | Curculionidae | Coleoptera |
| Roseslug, Bristly | Cladius difformis | Tenthredinidae | Hymenoptera |
| Roundheaded borer | various spp. | Cerambycidae | Coleoptera |
| Saltmarsh caterpillar | Estigmene acrea | Erebidae | Lepidoptera |
| San Jose scale | Quadraspidiotus perniciosus | Diaspididae | Hemiptera |
| Sap beetle | Carpophilus sp. | Nitidulidae | Coleoptera |
| Sawfly | various spp. | various | Hymenoptera |
| Sawfly, California pear | Pristiphora abbreviata | Tenthredinidae | Hymenoptera |
| Sawfly, Conifer | Neodiprion spp. | Diprionidae | Hymenoptera |
| Sawfly, Raspberry | Monophadnoides geniculatus | Tenthredinidae | Hymenoptera |
| Sawfly, Raspberry horntail | Hartigia cressoni | Cephidae | Hymenoptera |
| Sawfly, Willow leaf gall | Pontania pacifica | Tenthredinidae | Hymenoptera |
| Sawtoothed grain beetle | Oryzaephilus surinamensis | Silvanidae | Coleoptera |
| Scale | various spp. | various | Hemiptera |
| Scale, Black | Saissetia oleae | Coccidae | Hemiptera |
| Scale, Brown apricot | Parthenolecanium corni | Coccidae | Hemiptera |
| Scale, Brown soft | Coccus hesperidum | Coccidae | Hemiptera |
| Scale, Calico | Eulecanium cerasorum | Coccidae | Hemiptera |
| Scale, California red | Aonidiella aurantii | Diaspididae | Hemiptera |
| Scale, Citricola | Coccus pseudomagnoliarum | Coccidae | Hemiptera |
| Scale, Cottony cushion | Icerya purchasi | Margarodidae | Hemiptera |
| Scale, Cycad | Furchadaspis zamiae | Diaspididae | Hemiptera |
| Scale, Cypress bark | Ehrhornia cupressi | Pseudococcidae | Hemiptera |
| Scale, Euonymus | Unaspis euonymi | Diaspididae | Hemiptera |
| Scale, European elm | Gossyparia spuria | Eriococcidae | Hemiptera |
| Scale, European fruit lecanium | Parthenolecanium corni | Coccidae | Hemiptera |
| Scale, Frosted | Parthenolecanium pruinosum | Coccidae | Hemiptera |
| Scale, Greedy | Hemiberlesia rapax | Diaspididae | Hemiptera |
| Scale, Green shield | Pulvinaria psidii | Coccidae | Hemiptera |
| Scale, Irregular pine | Toumeyella pinicola | Coccidae | Hemiptera |
| Scale, Kuno | Eulecanium kunoense | Coccidae | Hemiptera |
| Scale, Latania | Hemiberlesia lataniae | Diaspididae | Hemiptera |
| Scale, Minute cypress | Carulaspis minima | Diaspididae | Hemiptera |
| Scale, Monterey cypress | Xylococculus macrocarpae | Margarodidae | Hemiptera |
| Scale, Oak pit | Asterolecanium sp. | Asterolecaniidae | Hemiptera |
| Scale, Obscure | Melanaspis obscura | Diaspididae | Hemiptera |
| Scale, Oleander | Aspidiotus nerii | Diaspididae | Hemiptera |
| Scale, Olive | Parlatoria oleae | Diaspididae | Hemiptera |
| Scale, Oystershell | Lepidosaphes ulmi | Diaspididae | Hemiptera |
| Scale, Purple | Lepidosaphes beckii | Diaspididae | Hemiptera |
| Scale, San Jose | Quadraspidiotus perniciosus | Diaspididae | Hemiptera |
| Scale, Sycamore | Stomacoccus platani | Margarodidae | Hemiptera |
| Scale, Tuliptree | Toumeyella liriodendri | Coccidae | Hemiptera |
| Scale, Walnut | Quadraspidiotus juglansregiae | Diaspididae | Hemiptera |
| Scale, Wax | Ceroplastes sp. | Coccidae | Hemiptera |
| Scorpion | various spp. | various | Scorpionida |
| Seedcorn maggot | Delia platura | Anthomyiidae | Diptera |
| Sequoia pitch moth | Synanthedon sequoiae | Sesiidae | Lepidoptera |
| Sharpshooter | various spp. | Cicadellidae | Hemiptera |
| Sharpshooter, Glassy-winged | Homalodisca vitripennis | Cicadellidae | Hemiptera |
| Shield bearer | Coptodisca sp. | Heliozelidae | Lepidoptera |
| Shore fly | Scatella stagnalis | Ephydridae | Diptera |
| Shothole borer | Scolytus rugulosus | Curculionidae | Coleoptera |
| Silver mite | Phyllocoptruta oleivora | Eriophyidae | Acari |
| Silverfish | Lepisma saccharina | Lepismatidae | Thysanura |
| Sixspotted mite | Eotetranychus sexmaculatus | Tetranychidae | Acari |
| Skeletonizer | Bucculatrix spp. | Bucculatricidae | Lepidoptera |
| Skeletonizer, Western grapeleaf | Harrisina brillians | Zygaenidae | Lepidoptera |
| Skipper, Fiery | Hylephila phyleus | Hesperiidae | Lepidoptera |
| Slug | various spp. | Agriolimacidae | Stylommatophora |
| Slug, Banded | Lehmannia poirieri | Limacidae | Stylommatophora |
| Slug, Gray garden | Deroceras reticulatum | Agriolimacidae | Stylommatophora |
| Slug, Greenhouse | Milax gagates | Milacidae | Stylommatophora |
| Slug, Tawny | Limacus flavus | Limacidae | Stylommatophora |
| Slug, Three-banded garden | Lehmannia valentiana | Limacidae | Stylommatophora |
| Smokybrown cockroach | Periplaneta fuliginosa | Blatellidae | Orthoptera |
| Snail | various spp. | Helicidae | Stylommatophora |
| Snail, Brown garden | Cornu (=Helix) aspersum | Helicidae | Stylommatophora |
| Snail, White garden | Theba pisana | Helicidae | Stylommatophora |
| Sod webworm | Crambus sperryellus | Crambidae | Lepidoptera |
| Southern chinch bug | Blissus insularis | Blissidae | Hemiptera |
| Southern fire ant | Solenopsis xyloni | Formicidae | Hymenoptera |
| Sowbug | various spp. | various | Isopoda |
| Sphinx moth | various spp. | Sphingidae | Lepidoptera |
| Spider | various spp. | various | Araneae |
| Spider mite | various spp. | Tetranychidae | Acari |
| Spider, Black widow | Latrodectus sp. | Theridiidae | Araneae |
| Spider, Brown recluse | Loxosceles sp. | Sicariidae | Araneae |
| Spider, Hobo | Tegenaria agrestis | Agelenidae | Araneae |
| Spider, Zoropsis | Zoropsis spinimana | Zoropsidae | Araneae |
| Spinach crown mite | Rhizoglyphus sp. | Acaridae | Acari |
| Spittlebug | various spp. | Cercopidae | Hemiptera |
| Spotted wing drosophila | Drosophila suzukii | Drosophilidae | Diptera |
| Springtail | various spp. | various | Collembola |
| Squash bug | Anasa tristis | Coreidae | Hemiptera |
| Stable fly | Stomoxys calcitrans | Muscidae | Diptera |
| Stick insect, Indian walking | Carausius morosus | Diapheromeridae | Phasmatodea |
| Stink bug | various spp. | Pentatomidae | Hemiptera |
| Stink bug, Brown marmorated | Halyomorpha halys | Pentatomidae | Hemiptera |
| Strawberry crown moth | Synanthedon bibionipennis | Sesiidae | Lepidoptera |
| Strawberry leafroller | Ancylus comptana fragariae | Tortricidae | Lepidoptera |
| Strawberry root weevil | Otiorhynchus ovatus | Curculionidae | Coleoptera |
| Subterranean termite | various spp. | Rhinotermitidae | Isoptera |
| Sycamore Borer | Synanthedon resplendens | Sesiidae | Lepidoptera |
| Sycamore scale | Stomacoccus platani | Margarodidae | Hemiptera |
| Symphylan | various spp. | various | Symphyla |
| Tawny slug | Limacus flavus | Limacidae | Stylommatophora |
| Tent caterpillar | Malacosoma sp. | Lasiocampidae | Lepidoptera |
| Tentiform leafminer | Phyllonorycter sp. | Gracillariidae | Lepidoptera |
| Termite | various spp. | various | Isoptera |
| Termite, Dampwood | Zootermopsis spp. | Termopsidae | Isoptera |
| Termite, Drywood | Incisitermes minor | Kalotermitidae | Isoptera |
| Termite, Subterranean | various spp. | Rhinotermitidae | Isoptera |
| Termite, Western subterranean | Reticulitermes hesperus | Rhinotermitidae | Isoptera |
| Thief ant | Solenopsis molesta | Formicidae | Hymenoptera |
| Three-banded garden slug | Lehmannia valentiana | Limacidae | Stylommatophora |
| Thrips | various spp. | various | Thysanoptera |
| Thrips, Avocado | Scirtothrips perseae | Thripidae | Thysanoptera |
| Thrips, Bean | Caliothrips fasciatus | Thripidae | Thysanoptera |
| Thrips, Citrus | Scirtothrips citri | Thripidae | Thysanoptera |
| Thrips, Cuban laurel | Gynaikothrips ficorum | Phlaeothripidae | Thysanoptera |
| Thrips, Greenhouse | Heliothrips haemorrhoidalis | Thripidae | Thysanoptera |
| Thrips, Myoporum | Klambothrips myopori | Phlaeothripidae | Thysanoptera |
| Thrips, Onion | Thrips tabaci | Thripidae | Thysanoptera |
| Thrips, Toyon | Liothrips (=Rhyncothrips) ilex | Phlaeothripidae | Thysanoptera |
| Thrips, Western flower | Frankliniella occidentalis | Thripidae | Thysanoptera |
| Tick (Lyme disease) | Ixodes pacificus | Ixodidae | Ioxidida |
| Tomato fruitworm | Helicoverpa zea | Noctuidae | Lepidoptera |
| Tomato pinworm | Keiferia lycopersicella | Gelechiidae | Lepidoptera |
| Tomato russet mite | Aculops lycopersici | Eriophyidae | Acari |
| Toyon thrips | Liothrips (=Rhyncothrips) ilex | Phlaeothripidae | Thysanoptera |
| Treehopper, Buffalo | Stictocephala bisonia | Cicadellidae | Hemiptera |
| Treehoppers | various spp. | Cicadellidae | Hemiptera |
| True bug | various spp. | various | Hemiptera |
| Tuberworm, Potato | Phthorimaea operculella | Gelechiidae | Lepidoptera |
| Tuliptree scale | Toumeyella liriodendri | Coccidae | Hemiptera |
| Tumbling flower beetle | Mordella spp. | Mordellidae | Coleoptera |
| Turkestan cockroach | Blatta lateralis | Blatellidae | Orthoptera |
| Tussock moth, Western | Orgyia vetusta | Erebidae | Lepidoptera |
| Twig beetle | Pityophthorus spp. | Curculionidae | Coleoptera |
| Twig girdler, Juniper | Periploca nigra | Cosmopterigidae | Lepidoptera |
| Twohorned oak gall wasp | Dryocosmus dubiosus | Cynipidae | Hymenoptera |
| Variegated cutworm | Peridroma saucia | Noctuidae | Lepidoptera |
| Vegetable weevil | Listroderes costirostris obliquus | Curculionidae | Coleoptera |
| Velvety tree ant | Liometopum occidentale | Formicidae | Hymenoptera |
| Vinegar fly | Drosophila sp. | Drosophilidae | Diptera |
| Walking stick, Indian | Carausius morosus | Diapheromeridae | Phasmatodea |
| Walnut husk fly | Rhagoletis completa | Tephritidae | Diptera |
| Walnut scale | Quadraspidiotus juglansregiae | Diaspididae | Hemiptera |
| Walnut twig beetle | Pityophthorus juglandis | Curculionidae | Coleoptera |
| Warehouse beetle | Trogoderma variabile | Bostrichidae | Coleoptera |
| Wasp stings | various spp. | Vespidae | Hymenoptera |
| Wasp, Wood | various spp. | Siricidae | Hymenoptera |
| Wax scale | Ceroplastes sp. | Coccidae | Hemiptera |
| Webworm, Fall | Hyphantria cunea | Erebidae | Lepidoptera |
| Webworm, Sod | Crambus sperryellus | Crambidae | Lepidoptera |
| Weevil | various spp. | Curculionidae | Coleoptera |
| Weevil, Bean | various spp. | Curculionidae | Coleoptera |
| Weevil, Black vine | Otiorhynchus sulcatus | Curculionidae | Coleoptera |
| Weevil, Citrus root | Diaprepes abbreviatus | Curculionidae | Coleoptera |
| Weevil, Cribrate | Otiorhynchus cribricollis | Curculionidae | Coleoptera |
| Weevil, Diaprepes root | Diaprepes abbreviatus | Curculionidae | Coleoptera |
| Weevil, Douglas-fir twig | Cylindrocopturus furnissi | Curculionidae | Coleoptera |
| Weevil, Filbert | Curculio occidentis | Curculionidae | Coleoptera |
| Weevil, Obscure root | Sciopithes obscurus | Curculionidae | Coleoptera |
| Weevil, Pea | Bruchus pisorum | Curculionidae | Coleoptera |
| Weevil, Pea leaf | Sitona lineata | Curculionidae | Coleoptera |
| Weevil, Pepper | Anthonomus aenotinctus | Curculionidae | Coleoptera |
| Weevil, Pine | Pissodes sp. | Curculionidae | Coleoptera |
| Weevil, Pine needle | Scythropus sp. | Curculionidae | Coleoptera |
| Weevil, Red palm | Rhynchophorus ferrugineus | Curculionidae | Coleoptera |
| Weevil, Strawberry root | Otiorhynchus ovatus | Curculionidae | Coleoptera |
| Weevil, Vegetable | Listroderes costirostris obliquus | Curculionidae | Coleoptera |
| Weevil, Woods | Nemocestes incomptus | Curculionidae | Coleoptera |
| Weevil, Yucca | Scyphophorus yuccae | Curculionidae | Coleoptera |
| Western conifer seed bug | Leptoglossus occidentalis | Pentatomidae | Hemiptera |
| Western flower thrips | Frankliniella occidentalis | Thripidae | Thysanoptera |
| Western grapeleaf skeletonizer | Harrisina brillians | Zygaenidae | Lepidoptera |
| Western lawn moth | Tehama bonifatella | Crambidae | Lepidoptera |
| Western Poplar Clearwing | Paranthrene robiniae | Sesiidae | Lepidoptera |
| Western subterranean termite | Reticulitermes hesperus | Rhinotermitidae | Isoptera |
| Western Tarnished Plant Bug (Lygus) | Lygus hesperus | Miridae | Hemiptera |
| Western tussock moth | Orgyia vetusta | Erebidae | Lepidoptera |
| Wheat curl mite | Eriophyes tulipae | Eriophyidae | Acari |
| White garden snail | Theba pisana | Helicidae | Stylommatophora |
| White grub | Cyclocephala sp. | Scarabaeidae | Coleoptera |
| Whitefly | various spp. | Aleyrodidae | Hemiptera |
| Whitefly, Giant | Aleurodicus dugesii | Aleyrodidae | Hemiptera |
| Widow spiders | Latrodectus sp. | Theridiidae | Araneae |
| Willow leaf gall sawfly | Pontania pacifica | Tenthredinidae | Hymenoptera |
| Windscorpion | Eremobates pallipes | Eremobatidae | Solifugae |
| Wireworm | various spp. | Elateridae | Coleoptera |
| Wood wasp or horntail | various spp. | Siricidae | Hymenoptera |
| Wood-boring beetle in homes | various spp. | various | Coleoptera |
| Woods weevil | Nemocestes incomptus | Curculionidae | Coleoptera |
| Woolly apple aphid | Eriosoma lanigerum | Aphididae | Hemiptera |
| Woolly hackberry aphid | Shivaphis celti | Aphididae | Hemiptera |
| Yellowjacket | various spp. | Vespidae | Hymenoptera |
| Yucca weevil | Scyphophorus yuccae | Curculionidae | Coleoptera |
| Zoropsis spider | Zoropsis spinimana | Zoropsidae | Araneae |