Pests to know in Modesto
Termites in Modesto
- UC IPM says drywood termites are most prevalent in southern California but also occur in the Central Valley. Their nests usually stay above ground and do not connect to soil.[6]
- Reticulitermes subterranean termites occur in nearly every region of California and are the state's most destructive termites. Their winged swarmers emerge on warm, sunny days after fall or spring rains.[6]
Invasive species reported here
- Aedes aegypti, the yellow fever mosquito, was found in Stanislaus County for the first time on July 25, 2019, in the City of Modesto.[2]
- Stanislaus County trappers work year-round checking insect traps for invasive pests, and most traps are placed in urban areas, the most common points of introduction.[8]
Pests local experts flag
Aedes aegypti bites aggressively during the day and lays eggs in containers as small as bottle caps. It flies only about 250 feet from where it hatched, so neighbors need to clear breeding sources together.[3]
Climate
Central Modesto (ZIP 95354) is in USDA plant hardiness zone 9b, where the average coldest winter night is 25 to 30°F.[10]
Public agencies that handle pests
- East Side Mosquito Abatement District covers about 540 square miles of Stanislaus County north of the Tuolumne River, including Modesto. Areas south of the river are served by Turlock Mosquito Abatement District.[1]
- East Side's services, including home inspections and mosquitofish, are free and funded by a small share of property taxes. The district handles only mosquitoes, not fleas, ticks or wasps.[2]
- An unmaintained swimming pool can produce up to 3 million adult mosquitoes in a month. East Side accepts reports of neglected pools and keeps the reporter anonymous.[5]
Hiring a licensed company
California created its Structural Pest Control Board through a 1935 law that provided for registering and licensing people who practice structural pest control.[7]
Free local help
UC Master Gardeners of Stanislaus County, based at UCCE in Modesto, answer gardening questions and send a weekly e-newsletter with pest management information.[9]
Through the year
- Summer to Fall
- The northern house mosquito, Culex pipiens, breeds in storm drains, catch basins and neglected pools, and is most active at night during summer and fall. It carries West Nile virus.[3]
- Summer to Fall
- Stanislaus County Public Health says human West Nile virus cases typically peak in August and September.[4]
Sources
- East Side Mosquito Abatement District, “About the District.” www.eastsidemosquito.com/about-the-district (accessed 2026-10-06)
- East Side Mosquito Abatement District, “Frequently Asked Questions (FAQs).” www.eastsidemosquito.com/frequently-asked-questions-faqs (accessed 2026-10-06)
- East Side Mosquito Abatement District, “Common Mosquitos of Stanislaus County.” www.eastsidemosquito.com/common-mosquitos-of-stanislaus-county (accessed 2026-10-06)
- Stanislaus County Health Services Agency, “Human West Nile Virus Cases in Stanislaus County.” www.schsa.org/pdf/press-releases/2026/26-03-Human-West-Nile-Virus-Cases-in-Stanislaus-County.pdf (accessed 2026-10-06)
- East Side Mosquito Abatement District, “Neglected Swimming Pool Notice.” www.eastsidemosquito.com/neglected-swimming-pool-notice (accessed 2026-10-06)
- UC Statewide Integrated Pest Management Program, “Subterranean and Other Termites.” ipm.ucanr.edu/home-and-landscape/subterranean-and-other-termites/ (accessed 2026-10-06)
- Structural Pest Control Board (California Department of Consumer Affairs), “Structural Pest Control Board Overview.” www.pestboard.ca.gov/about/overview.shtml (accessed 2026-10-06)
- Stanislaus County Agricultural Commissioner, “Pest Detection Program.” www.stanag.org/pest-detection.shtm (accessed 2026-10-06)
- UC Cooperative Extension Stanislaus County, “UC Master Gardeners of Stanislaus County.” ucanr.edu/site/uc-master-gardeners-stanislaus-county (accessed 2026-10-06)
- USDA ARS and PRISM, via phzmapi.org, “Plant hardiness zone for ZIP 95354 (2023 USDA map data).” phzmapi.org/95354.json (accessed 2026-10-06)
- National Pesticide Information Center, “State Pesticide Regulatory Agencies.” npic.orst.edu/reg/state_agencies.html (accessed 2026-10-06)