2026 Mosquito Surveillance and Abatement Program

2026-11-03

Larval Control and Abatement ( Ground and Aerial ): May 1 – September 30 • Planning and implementation of larval control activities , including ground or aerial applications of larvicides directed at breeding sites identified through surveillance results . • Larval abatement shall occur when : ▪ Based on the professional judgement of the contractor , when mosquito larvae or pupae are present across multiple dips per site ; or ▪ Persistent breeding activity is documented through repeated detections ; or ▪ Surveillance thresholds established by the Districts indicate imminent adult emergence . • Use of ground and / or aerial application methods shall be determined by site accessibility , habitat type , and treatment efficiency as approved by the Districts . • Provide , maintain , and calibrate , as appropriate , larvicide application equipment ( e . g ., ground sprayers , backpack sprayers , aerial dispersal systems , etc .), GPS units , and vehicles or aircraft to conduct control activities promptly and accurately . • Use of EPA and State of Montana Department of Agriculture approved and registered larvicides labeled for public health mosquito control , including insect growth regulators ( e . g ., Methoprene ) and biological larvicides ( e . g ., Bacillus thuringiensis israelensis ). • Documentation and reporting shall include : ▪ GPS coordinates and locations of each treated site ; ▪ Number of sites treated , dates , and product ( s ) used ; ▪ Method of application ( ground or aerial ); and ▪ Surveillance data supporting treatment decisions .

Montana

2026-04-29