West Nile: Mosquito War Begins

Mosquitos are sorted at the Dallas County mosquito lab in Dallas, Thursday, Aug. 16, 2012.  (AP)

A plane that will be used for aerial spraying is rolled onto the tarmac for a news conference in Dallas, Thursday, Aug. 16, 2012. (AP)

Dallas County Judge Clay Jenkins, right, speaks as Dallas Mayor Mike Rawlings looks on during a news conference in front of a plane that will be used for aerial spraying in Dallas, Thursday, Aug. 16, 2012.  (AP)

Dallas Mayor Mike Rawlings, center, holds a news conference in front of a plane that will be used for aerial spraying in Dallas, Thursday, Aug. 16, 2012.  (AP)

Mosquito tech Spencer Lockwood sorts mosquitos at the Dallas County mosquito lab in Dallas, Thursday, Aug. 16, 2012.  (AP)

Mike Stuart of Dynamic Aviation describes a plane that will be used for aerial spraying to the media in Dallas, Thursday, Aug. 16, 2012.  (AP)

Mike Stuart of Dynamic Aviation describes the plane that will be used for aerial spraying and it's difference from crop dusting during a news conference in Dallas, Thursday, Aug. 16, 2012.  (AP)

Dead mosquitos are lined up waiting to be sorted at the Dallas County mosquito lab in Dallas, Thursday, Aug. 16, 2012.  (AP)