The District uses truck-based applications as our primary adulticiding control method. The application is an Ultra-Low Volume (ULV) spray where small amounts of undiluted pesticide are dispersed by truck mounted equipment. The volume of pesticide is computer-controlled to provide the same amount per mile regardless of vehicle speed. The trucks are equipped with a GPS guidance system which directs the driver and tracks the amount of pesticide applied, vehicle speed and location.
ULV truck applications are conducted after sunset, when most mosquitoes are active, and the spray is most effective. Conducting treatments at night also reduces the risk of harming beneficial insects that are active during the daytime.
Adulticide treatments are determined on a day-to-day basis when surveillance has indicated that mosquito levels justify the need for spraying and is in accordance with state criteria.
During widespread mosquito outbreaks or during a medical emergency when there exists a threat to the public of a mosquito-transmitted pathogens such as St. Louis encephalitis, West Nile or Zika, IRMCD contracts with a company specializing in aerial adulticide spraying for the application of Dibrom (naled).