Nothing ruins a perfect summer evening like a swarm of mosquitoes. What begins as a pleasant afternoon barbecue can quickly turn into a frantic battle of swatting and scratching. The war against the almighty mosquito starts with water. These blood sucking pests like to lay their eggs on the surface of water, and they only need the barest amount. So do your part by clearing out any standing water. Next there is protecting yourself from bites. Dr. Dan Dockham with Mayo Clinic Health System Mankato says, "The best way to prevent all of this is with insect repellent, such as the DEET based stuff tends to work the best."