Heavy rain this winter, combined with some 90-degree days already this year, have created conditions that could see high incidents of mosquitoes and, possibly, cases on West Nile Virus in the months ahead. In response to the increase in mosquito populations, the San Joaquin County Mosquito and Vector Control District will expand surveillance and control of local mosquito populations on all private and public lands within San Joaquin County. Mosquito control activities include: making recommendations to property owners on methods to reduce mosquito breeding conditions; educating the public on mosquito prevention techniques, including the use of repellents; introducing mosquitofish to ponds, ditches, and other aquatic sites; and spraying areas where mosquitoes are found.