From Palo Alto Online
March 25, 2020
Palo Alto Baylands trails will be closed for several hours on Thursday for aerial treatment of mosquitoes, the Santa Clara County Vector Control District said in a press release issued Tuesday.
A helicopter crew will fly over the Baylands with a spray that targets the winter salt marsh mosquito (Aedes squamiger) with naturally occurring microbes and a mosquito-specific hormone. The treatment has been safely and effectively used by the county annually since 1992, the district said.
The aerial spraying is scheduled to start at 7:30 a.m. and will last a few hours.