Aerial mosquito spraying to begin tonight

State officials paved the way over the weekend for aerial pesticide spraying in the Rio Grande Valley, offering hope for some relief from the post-hurricane mosquito infestation.

After resolving some wrangling with U.S. Fish and Wildlife Service officials over the spraying of federal wildlife refuges and reserves, officials announced the operation would begin in Hidalgo, Cameron and Willacy counties tonight, if weather permits.

"Our residents will feel some relief soon," Hidalgo County Judge J.D. Salinas said in a news release.

Officials said spraying is expected to take five to six days.

Aerial sprayers are to remain at least a half-mile from any federal or state refuge or reserve, according to the news release.

Chicago-based Clarke Mosquito Control will use the chemical Dibrom, which the U.S. Environmental Protection Agency considers safe when used properly for mosquito control.

When EPA guidelines are followed, the concentration released during aerial spraying should not harm humans. The chemical is extremely toxic to insects, including those considered beneficial such as honey bees, according to the EPA Web site.

Excessive exposure to Dibrom by humans may result in over-stimulation of the nervous system and cause nausea, dizziness or confusion, according to the EPA.