Grant County Mosquito Control District No.1 (GCMCD) is announcing the beginning of the spray application season. The district will be utilizing multiple insecticides for 2025. These include Vectobac G/GS (EPA#73049-10), VectoMax FG (EPA#73049-429), Altosid P35 (EPA#89459-95) Altosid XR-G Ultra (EPA#89459-104), Fourstar Bti CRG (EPA#85685-4) Natular G/Censor (EPA#8329-80), Natular G30 (EPA#8329-83), CoCo Bear (EPA#8329-93), BVA 2 Larvicide Oil (EPA#70589-1), Duet (EPA#1021-1795-8329), Zenivex E20 (EPA#2724-791), and Merus 3.0 (EPA#8329-108). The active ingredients of these insecticides are Bacillus thuringiensis israelensis, Bacillus sphaericus, Methoprene, Spinosad, Sumithrin, Piperonyl Butoxide, Prallethrin, Pyrethrin, and Etofenprox. Applications will begin in March and continue through October 2025, all of which are weather dependent. Treatment locations will be within the mosquito control district defined at www.gcmcd1.org. More information about the insecticides planned for use can be found at www.clarke.com, www.valentbiosciences.com, and www.centralmosquitocontrol.com. Visit www.agr.wa.gov for information on how to be added to the pesticide sensitivity registry. The Washington State Department of Ecology Aquatic Pesticides Permit Manager is Shawn Ultican (360) 870-3492. The NPDES Permittee is Ann Belchik-Moser, the District Manager of GCMCD. (509) 765-7731, PO Box 5090, Moses Lake, WA 98837.

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