The Chiwawa Mosquito District is ...

The Chiwawa Mosquito District is beginning seasonal activities. Only when sufficient mosquito larvae are found will they use one of the following species-specific larvicides: VectoBac12AS EPA# 73049-38 (Bacillus thuringiensis [Bti]); VectoBac GS EPA# 73049-10 (Bti); VectoLex FG EPA# 73049-20 (Bacillus sphaericus [Bs]); VectoLex WDG EPA# 73049-57 (Bs); VectoMax FG EPA# 73049-429 (Bti & Bs), VectoPrime FG EPA# 73049-501 (Bti & S-Methoprene); Duplex-G EPA# 89459-93 (Bti & S-Methoprene) and BVA2 Larvicide Oil EPA#70589-1 (mineral oil) for late stage larvae and pupae on impounded water bodies. Only in areas where adult mosquitoes cause extreme annoyance or mosquito transmitted disease is present will the district treat using an adulticide with PBO in combination with one or multiple pyrethrin or pyrethroids, their synthetic derivatives. All would be applied via Ultra Low Volume (ULV) at less than 1 ounce per acre, at a time of day minimizing their affects on non-target organisms. Mosquito control activities will continue throughout the season until mid-September. Any person desiring to present their views to Ecology regarding this application may do so in writing within thirty days of the last date of publication of this notice. Comments must be submitted to Ecology. Any information provided is a public record. Comments can be submitted to: Department of Ecology Water Quality Program, Attn: Aquatic Pesticide Permit Manager P.O. Box 47696 Olympia, WA 98504-7696 For further information or to report mosquito problems, contact us at questions@chiwawadistrict.com or phone the district office (509) 888-3335. Published in The Leavenworth Echo/Cashmere Valley Record May 21 and 28, 2025. #9985