Denton County officials will need to run a few tests to see whether aerial spraying for mosquitoes that carry the West Nile virus was effective, said Jamie Moore, Denton County emergency services spokesman.
County health officials trapped mosquitoes Sunday and will trap again today in areas that received two aerial applications of the Duet pesticide, Moore said.
The officials will test to see if the spray reduced the number of mosquitoes that carry the West Nile virus.
“It takes several weeks to get the official report on effectiveness,” Moore said.
Dynamic Aviation and Clarke, a mosquito control company, began aerial spraying in several parts of the county Friday and Saturday night to prevent the spread of the virus. The company was also scheduled to spray Sunday night, weather permitting.
High winds forced the company to reschedule and extend its aerial treatments into the weekend.
County Judge Mary Horn declared a health emergency Aug. 22 and called for the spraying, giving each of the county’s 44 municipalities the choice to either opt in or out. Denton, Haslet, Hebron, Providence Village, The Colony and Corinth all opted out.
As of Saturday night, Clarke had treated most of the county. An area north of Krum was the only portion of the county not treated Saturday night.
Aerial spraying was set to end early this morning around 2 a.m. as crews were scheduled to treat areas south of Lewisville, areas of Flower Mound, Roanoke, Trophy Club, Southlake and towns north of Krum.
Every area needs about two applications of the spray to be effective.
As of Sunday afternoon, the Denton County Health Department had reported 77 positive mosquito pools, two West Nile virus-related deaths among the 145 human cases of the virus — with 102 cases diagnosed as West Nile fever, which has milder symptoms, and 43 diagnosed as the more serious neuro-invasive disease.
JOHN D. HARDEN can be reached at 940-566-6882. His e-mail is firstname.lastname@example.org .