More Mosquito Bites

In Maricopa County, Ariz., huge numbers of foreclosed or abandoned homes have vacant swimming pools and unattended ponds. The stagnant waters – known as green pools -- are a hotbed for mosquito breeding, say local authorities. Crews have treated more than 4,000 green pools already in 2009. During the same period in 2007, before metropolitan Phoenix’s housing market collapsed, they had treated only 2,500. While most are on vacant properties, some also belong to residents who can't afford to maintain their pools and ponds.