From Surveillance To Control: Evaluation of A Larvicide Intervention Against Aedes aegypti In Brownsville, Texas

Selene M. Garcia-Luna, Luis Fernando Chaves, José G. Juarez, Bethany G. Bolling, Arturo Rodriguez, Ysaias E. Presas, John Paul Mutebi, Scott C. Weaver, Ismael E. Badillo-Vargas, Gabriel L. Hamer, Whitney A. Qualls

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


South Texas is recognized as a potential area for the emergence and re-emergence of mosquito-borne diseases due to recent circulation of Zika, chikungunya, and dengue viruses. During 2017, high Aedes aegypti abundance found in the city of Brownsville, TX, in combination with the previous year's local transmission of Zika virus, triggered the activation of the Texas Department of State Health Services Emergency Mosquito Control Contingency Contract. A contract with the Clarke Environmental and Mosquito Control was a response to control Ae. aegypti, using a ground-based wide-area larvicide spray (WALS™) containing Bacillus thuringiensis israelensis. The WALS application was evaluated through a field-based bioassay and by comparing surveillance data pre- and post-WALS application. The WALS application bioassay demonstrated that the larvicide was effective up to 60 m into the target properties. Additionally, the number of Ae. aegypti captured in traps decreased in the WALS intervention areas compared with the untreated control areas, with an estimated 29% control.

Original languageEnglish (US)
Pages (from-to)233-237
Number of pages5
JournalJournal of the American Mosquito Control Association
Issue number3
StatePublished - Sep 1 2019
Externally publishedYes


  • Field evaluation
  • larvicide
  • mosquito abundance
  • surveillance
  • wide-area larvicide

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Public Health, Environmental and Occupational Health
  • Insect Science


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