VENTURA — As temperatures continue to rise this May, Ventura County residents are encouraged to take steps to prevent mosquito breeding and protect themselves from bites as peak mosquito season begins. Mosquito activity started earlier than usual this year due to above-average temperatures, including the warmest March on record, along with increased rainfall. In addition to native mosquito species that can transmit West Nile Virus (WNV), the invasive Aedes aegypti mosquito has become established in Ventura County.