A06_Horning_and_Tyrrell_Application_Mix_Ratios_2026.xlsx

This is a product needs and mix ratio calculation spreadsheet for aerial application of Esfenvalerate insecticide at two U.S. Forest Service seed orchards in Oregon for 2026.

The Horning Seed Orchard (HSO) application covers 38.5 acres across nine orchard units, requiring 11.08 gallons of Esfenvalerate formulation and 3.2 ounces of Antero-EA or R-56 spreader sticker per application. The application rate is standardized at 0.29 gallons of formulation per acre (36.85 ounces per acre), based on 0.19 pounds of active ingredient per acre mixed in 10 gallons of water. For two applications, the total product need is 22.2 gallons of Esfenvalerate and 6.4 ounces of spreader sticker. The Tyrrell Seed Orchard (TSO) application covers 47.2 acres across thirteen orchard units in coastal Oregon, requiring 13.59 gallons of Esfenvalerate formulation and 94.4 ounces of Antero-EA spreader sticker for one application. For two TSO applications, requirements increase to 27.17 gallons of Esfenvalerate and 188.76 ounces of spreader sticker. Combined, both orchards require approximately 33.3 gallons of Esfenvalerate formulation for single applications or 49.4 gallons for dual applications. The spreadsheet provides detailed unit-by-unit calculations including acreage, tank loads needed (100-gallon capacity), and water requirements to support aerial spray operations conducted by the Bureau of Land Management.