US state spotlight
Pest control in California
California is large enough to be several pest countries: drywood termites and Argentine ants in the south and coast, Norway rats in ports, roof rats in suburbs, mosquitoes in irrigated valleys, and mountain wildlife at the edges of towns. DPR regulation means the product on a national blog may not be the product on a California shelf.
Climate and housing that drive pests
Mediterranean coast, Central Valley agriculture, desert southeast, and alpine east. Each has a different termite and ant complex. Wildfire years displace rodents and increase indoor wildlife calls.
Pests that dominate this region
- Argentine ant — The defining urban ant along much of the coast.
- Drywood termite — Common structural pest in southern counties.
- Roof rat — Attics, vines, and fruit.
- Subterranean termite — Present; do not assume every termite is drywood.
- Mosquito — District-level control in many counties; invasive Aedes in some cities.
- German cockroach — Urban housing.
Seasonal calendar
| Season | What to watch |
|---|---|
| Winter | Rains push ants and rodents. Check crawlspace moisture. |
| Spring | Termite alates. Wildlife exclusion windows. |
| Summer | Drought foraging. Yellowjackets. |
| Fall | First storms. Rodent-proof before wet weather. |
Rules, labels, and who can treat
California Department of Pesticide Regulation and county agricultural commissioners. Structural pest control has its own licensing board culture. Prop 65 notices on products are not IPM instructions — still read the EPA/DPR label.
Practical notes for this region
Fumigation for drywood termites is a neighbor-notice, pet, plant, and food-removal operation. Hire the licensee; do not improvise.