Pest Library
Orange County Pest Library
A field guide to the 15 pests we encounter most across our nine-city OC route — what they look like, where they live in Orange County homes, and what makes each one worth (or not worth) treating professionally.
Trident's Pest Library covers the 15 pests we actually see most across Orange County — organized by category, each with identification, habitat, signs of infestation, real risk profile, and the specific situations where licensed treatment matters. Written by the team performing the work under California Structural Pest Control Board License #PR8662.
Ants
Persistent trails, super-colonies, and the species mix-ups that cause DIY treatments to backfire.
Argentine Ants
Linepithema humile
Small brown ants that follow trails along countertops and walls — the dominant pest ant of Orange County.
Odorous House Ants
Tapinoma sessile
Small brown ants that smell like rotten coconut when crushed — easily confused with Argentine ants.
Spiders
Black widows, brown widows, and the difference between medically-significant species and the nuisance majority.
Black Widow Spiders
Latrodectus hesperus
Glossy black spiders with a red hourglass on the underside — common in OC block walls and meter boxes.
Brown Widow Spiders
Latrodectus geometricus
Lighter cousin of the black widow — now widespread in Orange County's suburbs and arguably more common than black widows.
Cockroaches
Indoor-breeding German roaches and the larger, drain-driven Americans — different problems, different treatment.
German Cockroaches
Blattella germanica
Small light-brown roaches that breed indoors and infest kitchens — the worst cockroach for homes and food service.
American Cockroaches
Periplaneta americana
Large reddish-brown roaches that come up through drains and from exteriors — the 'palmetto bug' of OC.
Rodents
Roof rats in the attic, Norway rats at ground level, and house mice through pencil-width gaps.
Norway Rats
Rattus norvegicus
Large stocky brown rats that burrow at ground level — a sewer, garbage, and ground-level problem in OC.
Roof Rats
Rattus rattus
Sleek climbing rats that enter homes through the roofline — the dominant rat of Orange County's mature-canopy neighborhoods.
House Mice
Mus musculus
Small gray-brown mice that exploit pencil-width gaps and reproduce explosively in pantries and walls.
Termites
Coastal-OC drywood activity in framing, and subterranean colonies driven by foundation moisture.
Subterranean Termites
Reticulitermes hesperus
Soil-dwelling termites that build mud tubes from the ground into wood — driven by foundation moisture in OC.
Drywood Termites
Incisitermes minor
Wood-dwelling termites that don't need soil — endemic to coastal OC framing, with fall swarms.
Specialty pests
Bed bugs, fleas, yellowjackets, and silverfish — the specialty pests with their own playbooks.
Bed Bugs
Cimex lectularius
Apple-seed-sized brown insects that hide in mattress seams and bite at night — caught early or caught expensive.
Fleas
Ctenocephalides felis
Small dark jumping insects that bite ankles and infest carpets — most of the population isn't on your pet.
Yellowjackets
Vespula pensylvanica
Aggressive black-and-yellow wasps that build paper nests in voids, eaves, and ground holes — sting risk.
Silverfish
Lepisma saccharinum
Fast, fish-shaped silvery insects that hide in damp paper-and-starch-rich storage — common in OC bathrooms and garages.
Not sure what you're looking at?
Send a photo and a description with your quote request — identification is part of every job, and the right treatment depends on getting it right.