For the formula of Captan I used to use, which was the agricultural standard, I would use 1 dry cup for 25 gallons of spray. Came up with this by weighing the stuff. I've always wanted a formula to break down per acre to per gallon though. I end up figuring it out in some convoluted way using a ratio of another product as listed by Cornell recs. They usually have something with per gallon and per acre calibrations.
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