Anvil is an insecticide widely employed to combat West Nile fever, a mosquito-borne disease identified in approximately 10,000 residents of the United States from 1999-2006.
Anvil is applied aerially via fixed-wing and rotary aircraft or via ground applications (truck/ATV/backpack) using ultra-low volume (ULV) sprayers.
According to the Anvil Technical Bulletin published in January 2006, these sprayers create a fine mist of drops that average 17 micrometres in size.
[1] In 2003, Anvil was used to treat more than one million acres (4,000 km²) in Larimer County, Colorado during a West Nile virus outbreak.
In 2006, Anvil was used in Massachusetts after Governor Mitt Romney declared a state of emergency after the virus that causes Eastern equine encephalitis (EEE) was identified in large quantities in mosquito populations and again in 2019 via aerial spraying after multiple people tested positive for EEE.