Vector control officials brief Duarte on black fly activity and local control steps
San Gabriel Valley Mosquito & Vector Control officials told the Duarte City Council that black fly activity in foothill communities is driven by fast‑moving water and releases from dams; the district is expanding larval monitoring, using Bacillus thuringiensis israelensis treatments and has launched an alert system for residents.
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The San Gabriel Valley Mosquito and Vector Control District on Monday told Duarte officials that recurring black fly activity in foothill communities is tied to breeding in fast‑moving water and to regional water releases, and that control options are limited because adult black flies can fly miles from breeding sites.
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