I have the Citricidal, heh, the same bottle I bought 25 years ago! Be interesting to try it for aphids, the bane of my existence in the winter. So that website indicates to use one ounce per gallon of water for crop spray. That seems like a lot. Although, farther down the page, they recommend a minimum 5 to 6 drops per gallon for watering. Hmmm. Sounds like that would be the better strength if using it for a preventive fungicide.
Do post more if you find additional information. It's an interesting idea.
