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Sugar Land staff recommend reducing routine mosquito spraying after pilot study finds limited impact
Summary
A nine‑week city pilot with 19 trap sites found overlapping counts across no‑spray, one‑spray and two‑spray zones; Public Works staff recommended cutting routine adulticide to once weekly and using targeted sprays only when surveillance detects disease‑carrying mosquitoes.
Sugar Land public‑works staff presented results of a nine‑week mosquito‑control pilot and recommended scaling back routine adulticide spraying after the study found no statistically significant reduction in trap counts where the city sprayed more frequently.
Her Meyer, director of public works, told council the city tested six treatment zones and a control zone with different spray schedules and monitored 19 trap locations; the adulticide used for the project was Control 3030, an EPA‑approved product. Meyer summarized the result bluntly: “The spray was not as effective as what we thought,” explaining that averaged trap counts for no‑spray, one‑spray and two‑spray schedules overlapped in their confidence ranges during the nine‑week study.
Based on those findings, staff recommended reducing routine citywide evening adulticide spraying from two times per week to once per week, with a tiered response that adds targeted sprays only in zones where surveillance tests return disease‑carrying (vector) mosquitoes. Staff emphasized that larval control (slow‑release larvicide tablets), standing‑water mitigation, surveillance and public education would continue as complementary measures.
Councilmembers pressed staff on several points: whether the pesticide selection and application were appropriate (Meyer said the product used is EPA‑approved and that staff worked with experienced vendors), whether continued larvicide emphasis could reduce nuisance populations, and whether mosquito migration from neighboring jurisdictions could blunt local spray effects. Meyer said neighboring jurisdictions often spray only when disease is detected, and reiterated that the recommended change would be data‑driven and include ongoing monitoring; staff said they would continue surveillance for an additional year and return with updated results.
No formal council action was taken at the workshop; staff sought council feedback and direction to proceed with the proposed change and continued data collection.
