Public Notice of Mosquito Control Activities
The Skamania County Mosquito Control District will begin seasonal activities around March 23,
2026. We will use one of the following larvicides only when mosquito larvae are found.
- VectoMax WSP (Bacillus Sphaericus, Bacillus Thuringiensis Israelensis): specific for
mosquito larva - VectoBac G (Bacillus thuringiensis subsp. israelensis (strain AM65-52) specific for
mosquito larvae. - Vectomax FG (Bacillus Sphaericus, Bacillus Thuringiensis, (subsp) israelensis
- MetaLarv XRP (s) Methoprene
- Natular G30 WSP (Spinosad (a mixture of spinosyn A and spinosyn D)
- Altosid Pellets WSP (S-Methoprene) a growth inhibitor active on early stages of mosquito
larva - Agnique (poly-alpha –w-hydroxy): a monomolecular surface film used for later stages of
larva and pupa
Later in the season and only in those areas where adult mosquitoes reach thresholds as specified
in the District’s IMM plan or if mosquito-transmitted disease is detected, will the district
adulticide using:
- Permasease 4-4 – fogged at a rate between 0.001 and 0.007 pounds per acre
- Biomist 4+4 – fogged at a rate 0.00175-0.0007 pounds per acre
Depending on weather conditions, mosquito control activities will continue throughout the
season until mid to late October.
Phone or email the Mosquito Control District for further information or to report mosquito
problems within the district boundaries – (360) 904-4345 or bwilliams@scmcd.org. Additional
information and schedule changes will be posted and updated on our website https://scmcd.org
You may also contact the Dept. of Ecology, Water Quality Program, Attn: Aquatic Pesticide Permit
Manager, P.O. Box 47696, Olympia, WA 98504