File:1990. Aero Tech's Air Tractor 402 spray plane with Micronair spray nozzles. Yakima Reservation western spruce budworm suppression project. (36339848254).jpg

Aero Tech's Air Tractor 402 spray plane with Micronair spray nozzles. Yakima Reservation western spruce budworm suppression project.

Photo by: Unknown Date: 1990

Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: R6 FHP slide collection; Regional Office, Portland, Oregon

Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: <a href="https://www.fs.usda.gov/main/r6/forest-grasslandhealth" rel="nofollow">www.fs.usda.gov/main/r6/forest-grasslandhealth</a>

From the 1990 Western Spruce Budworm Suppression Project, Yakima Indian Reservation. Prepared by James S. Hadfield, Forest Pest Management, USDA Forest Service, Pacific Northwest Region available here: <a href="https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev2_026558.pdf" rel="nofollow">www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev2_026558.pdf</a>

"The USDA Forest Service, USDI Bureau of Indian Affairs, and the Yakima Indian Nation Tribal Council carried out a project to suppress an outbreak of western spruce budworm on the Yakima Indian Reservation in central Washington. Thuricide 48LV, a biological insecticide using Bacillus thuringiensis variety kurstaki [Btk] as the active ingredient was applied undiluted at the rate of 1/3 gallon per acre to 70,827 acres. Application was made by helicopters and single engine airplanes. Early larval density prior to spraying averaged 27.3 budworm larvae per 45 CM mid-crown branch tip. Post-spray density averaged 1.0 budworms per branch for a 96.5 percent population reduction. Cost for the treatment was $15.35 per acre. ... Aero Tech provided 3 Air Tractor 400 airplanes and 2 UH1B-204 helicopters for application aircraft, 2 Bell 206s and 2 Hughes 500s for observation helicopters, and support personnel and equipment. One of the 204 helicopters was badly damaged in a crash and was replaced by a Bell 206 equipped for spraying. ... Aero Tech leased a privately owned airstrip and hanger at White Swan, Washington. All aerial activity was staged from this facility."

For other R6 pesticide application project documentation see: <a href="https://www.fs.usda.gov/detail/r6/forest-grasslandhealth/insects-diseases/?cid=fsbdev2_027320" rel="nofollow">www.fs.usda.gov/detail/r6/forest-grasslandhealth/insects-...</a>

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