I have been trying this, it dont work! It seemed to work on very mild outbreaks, but anything serious it dont. I have went as much as 1 tablespoon to 1/2 cup water, sure it vanished when sprayed, but in a few hours was right back. Clip clip! not back yet! If this persists as it did last year, I will be mixing up a batch of Trifecta Crop Control for certain plants. I will be adding a circulating fan for the early morning hours as well.