The Department of Public Health launched planes to spray pesticide over Bridgewater, Easton, Norton, Raynham, Taunton and West Bridgewater.
Officials said Friday that they will conduct their second spraying of the summer Monday evening after 7 p.m. They said the time and date could change based on weather conditions.
A third night of aerial spraying for mosquitoes will take place Sunday evening, according to the Massachusetts Department of Public Health.
A second night of aerial spraying for mosquitoes will take place Saturday into Sunday, according to the Massachusetts Department of Public Health.
State public health officials have issued new guidelines that could lead to more aerial spraying of mosquitoes to prevent the spread of eastern equine encephalitis.
The Norfolk County Mosquito Control Project continued its pre-emptive assault on mosquito population Friday in Walpole.
Mosquito spraying will begin next week in a number of neighborhoods west of Boston.