the county is state of the art. They have planes, vietnam era helicopters, and fogger trucks. They test the mosquitoes to see what kind they are and treat accordingly. The salt water marsh mosquitoes are especially vicious. they are especially concerned if zika gets started. i don't know what they spray, but it is at night when everyone is inside. i did hear that they are afraid the mosquitoes are getting resistant. just think, without air conditioning and mosquito control---no body would live in south florida. in the 1800s the mosquitoes were so bad that the cattle would suffocate to death because they could not breathe oxygen