Bifenthrin. Its the same chemical you find in the Home Defense line of bug killers. Kills every sort of bug out there. Talstar P is a brand with a higher concentrate that you mix with water. Mix one ounce of product per 1/gal of water and spray the perimeter around your area. Everyone that I know that uses it has great results.
+1. I also use the Talstar P with a pump sprayer and that stuff is absolutely fantastic. I bought a gallon of it 4 years ago off amazon and I still have about 30-40% of it left and I spray about 2.5 acres twice a year. Mosquitos, ticks, you name it. The stuff works wonders. It takes me about an hour to do my 2.5 acres – much quicker than the bottles you hook up to your hose. Also, you don’t waste all that water that you do with the bottles you hook up to your hose.