A Beechcraft airplane sprays the insecticide DUET over Dallas County to curb the spread of West Nile virus late Sunday night, Aug. 19, 2012, in Addison, Texas. Storms interrupted aerial spraying on Thursday and Friday nights but county official said they were able to spray about 88,000 acres with pesticide that targets mosquitoes on Friday night. The remaining 222,000 acres were expected to be sprayed Sunday night. (AP Photo/LM Otero)