Area cities spray after positive West Nile samples

09/02/2014 8:49 AM

09/02/2014 8:50 AM

Area cities in Northeast Tarrant County have been springing into action recently by administering mosquito control ground spraying in the wake of confirmation of local mosquito samples testing positive for carrying the West Nile virus.


Keller moved forward with ground spraying for mosquitoes at four sites in its city limits on Thursday and Friday. The decision comes after confirmation the week before of the city’s first 2014 mosquito cases of West Nile virus.

Mosquitoes that tested positive for the virus were collected from three traps, in the 400 block of North Pearson Lane, the 1400 block of Shady Hollow Court and the 150 block of West Bear Creek Parkway.

City leaders had planned to wait for a second set of data from the Tarrant County Public Health Department last week before approving adulticiding measures. That timeline changed, however, with the announcement of a human case of West Nile virus in North Richland Hills close to the cities’ border.

In accordance with the city’s mosquito abatement policies and recommendations from the county health department, efforts on Thursday and Friday nights were targeted within a quarter mile of the collection sites. Backpack-based ground fogging occurred on public land within that radius, focusing on roadside ditches, storm water basins, culverts and highly-vegetated areas. Given its proximity to the West Bear Creek Parkway collection site, city officials decided also to ground spray the Keller Sports Park property.

Workers used water-based insecticides that offer low-toxicity, low odor, rapid biodegradation and high mosquito mortality.


Grapevine sprayed last week after receiving two positive samples that week. One was detected in the 1800 block of Hall-Johnson Drive and another in the 2600 block of Briarwood Drive. They sprayed within a half mile radius of both areas.

The Briarwood Drive area had had positive mosquito samples detected previously, so they sprayed that area on three consecutive nights: Thursday, Friday and Saturday.

The Hall-Johnson area was sprayed on Thursday.

It was something residents are getting used to seeing. The city sprayed the week before in two locations after receiving confirmation that local mosquito samples had tested positive for carrying the West Nile virus.

The city’s first positive sample this year was found Aug. 13 in 2700 block of Whitby Lane in Yorkshire Meadows Park. The city sprayed the following day, covering a half-mile radius from the sample site.

Then, two more mosquito samples tested positive. One was again found in the 2700 block of Whitby and the other in the 2600 block of Briarwood Drive. (Fire Station 3).

Vector Disease Control International (VDCI) sprayed within a half-mile radius of the 2700 block of Whitby Lane on Aug. 21, 22 and 23.

VDCI sprayed within a half-mile radius of 2600 Briarwood Drive on Aug. 21.

Grapevine follows Tarrant County’s recommendations for ground spraying when West Nile virus samples test positive.

Last year, the county’s first positive sample for West Nile was reported June 27 in Grapevine.

Grapevine sprayed for mosquitoes a day after the June positive test was confirmed at a trap in the 300 block of West Dallas Road, located near the police station.

The city continues to follow efforts of past years to hand out mosquito larvicide dunks to kill larvae that can be placed in standing water that cannot be drained.

The larvicide dunks can be obtained in Parks and Recreation administration at City Hall at 200 South Main St. or at the Municipal Service Center at 501 Shady Brook Drive during normal operating hours.

They are available to Grapevine residents at no charge with a limit of two per month.

To report standing water or mosquito problems, Grapevine residents can call 817-410-3330. For additional information on mosquito control, visit


Southlake officials announced last week that a second mosquito sample has tested positive for the West Nile virus.

The sample was taken in the 700 block of Ashleigh Lane, which is south of Rockenbaugh Elementary, according to the city’s website.

The city ground sprayed a half-mile radius around the sample site.

A positive sample was found earlier this month in the 500 block of Regency Crossing. Both positive samples were in the Timarron subdivision.

“Many people don’t realize that back yards are unintended breeding grounds for mosquitoes,” Public Works Director Bob Price said in a statement.

“Mosquitoes prefer stagnant water and any area that holds a little more than a teaspoon of undisturbed water for a couple of days can become a breeding ground for mosquitoes.”


The City of Colleyville used backpacks and ATVs to groundspray four locations last week.

Three were along Little Bear Creek on the city’s Southside including the Colleyville Nature Center, Plymouth Hills and Windview Estates. The fourth location is in the city’s northwest quadrant near Whittier Heights.

The city has sprayed the Windview Estates location before, but this is the first time for positive results at the other locations.

City spokeswoman Mona Gandy said the positive samples near Windview estates were collected before the city sprayed following a previous result.

And in other cities, all residents are being encouraged to continue assisting the city with mosquito abatement by checking that ponds and drainage channels are not stagnant and items such as wheelbarrows, play pools, swimming pools, bird baths, yard toys and other places water collects are emptied or drained.

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