Pow-Wows, or Long Lost Friend, by John George Hoffman, [1820], at sacred-texts.com
TO PREVENT THE HESSIAN FLY FROM INJURING THE WHEAT.
Take pulverized charcoal, make ley of it, and soak the seed wheat in it; take it out of the ley, and on every bushel of wheat sprinkle a quart of urine; stir it well, then spread it out to dry.