Pests to know in Stockton
Termites in Stockton
UC IPM says drywood termites are most common in southern California but also occur along much of the coast and in the Central Valley.[5]
Invasive species reported here
- The yellow fever mosquito, Aedes aegypti, was first detected in Stockton in 2019 and has since spread to every city in San Joaquin County.[1]
- The county Pest Detection Program traps for invaders such as spongy moth, Japanese beetle and spotted lanternfly, mostly March through October; Asian citrus psyllid trapping runs all year.[8]
Pests local experts flag
The ticks most often found in San Joaquin County are the American dog tick, the Pacific Coast tick, and the brown dog tick; the western blacklegged tick turns up occasionally.[3]
Climate
Central Stockton (ZIP 95202) is in USDA plant hardiness zone 9b, where the average coldest winter night is 25 to 30°F.[10]
Public agencies that handle pests
- The district says the two main mosquitoes spreading West Nile virus in San Joaquin County are Culex tarsalis and Culex pipiens; Aedes aegypti is not a competent West Nile vector.[2]
- The district offers identification and information for bees, wasps, bed bugs and flies, but property owners must hire a private pest control company to control them.[4]
Local rules and responsibilities
For a reported neglected green pool, the district tries to reach the owner; if access is refused, it can obtain a search warrant and enter with law enforcement.[4]
Hiring a licensed company
- The San Joaquin County Agricultural Commissioner requires structural pest control businesses, among other pest control operators, to register with the county every year.[6]
- California's Structural Pest Control Board keeps a Wood Destroying Organism database where anyone can check whether a property was inspected in the last two years.[7]
Free local help
UC Master Gardeners of San Joaquin County run a free gardening help desk in Stockton, staffed Monday through Thursday mornings, and ask that insect samples arrive intact.[9]
Through the year
- Spring to Fall
- The district surveys parks and river areas for adult ticks mostly from November through April, when ticks are most abundant locally.[3]
- Spring to Fall
- Subterranean termite swarms may appear on warm, sunny days after fall or spring rains, when winged reproductives leave underground nests in large numbers.[5]
Sources
- San Joaquin County Mosquito & Vector Control District, “San Joaquin County Mosquito & Vector Control District.” www.sjmosquito.org/ (accessed 2026-10-06)
- San Joaquin County Mosquito & Vector Control District, “The Invasive Yellow Fever Mosquito, Aedes aegypti.” www.sjmosquito.org/Mosquito-Diseases-Prevention/Invasive-Aedes-and-Their-Diseases (accessed 2026-10-06)
- San Joaquin County Mosquito & Vector Control District, “Ticks & Tick Borne Disease.” www.sjmosquito.org/Mosquitoes-Ticks/Tick-Information (accessed 2026-10-06)
- San Joaquin County Mosquito & Vector Control District, “Frequently Asked Questions.” www.sjmosquito.org/FAQ (accessed 2026-10-06)
- UC Statewide IPM Program (UC ANR), “Pest Notes: Subterranean and Other Termites.” ipm.ucanr.edu/home-and-landscape/subterranean-and-other-termites/ (accessed 2026-10-06)
- San Joaquin County Agricultural Commissioner, “Pest Control Business/License Registration.” www.sjgov.org/department/agcomm/agricultural-programs/pesticide-use-enforcement/business-license-registrations (accessed 2026-10-06)
- California Structural Pest Control Board, “Search for Termite Inspection Information.” www.pestboard.ca.gov/howdoi/terminspect.shtml (accessed 2026-10-06)
- San Joaquin County Agricultural Commissioner, “Pest Detection.” www.sjgov.org/department/agcomm/agricultural-programs/pest-detection (accessed 2026-10-06)
- UC Master Gardeners of San Joaquin County (UC ANR), “Help Desk.” ucanr.edu/site/uc-master-gardeners-san-joaquin-county/help-desk (accessed 2026-10-06)
- USDA ARS and PRISM, via phzmapi.org, “Plant hardiness zone for ZIP 95202 (2023 USDA map data).” phzmapi.org/95202.json (accessed 2026-10-06)
- National Pesticide Information Center, “State Pesticide Regulatory Agencies.” npic.orst.edu/reg/state_agencies.html (accessed 2026-10-06)