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The "Cornell Formula" is a fungicide mixture made of household ingredients: baking soda, water, vegetable (or horticultural) oil and castile soap. Something along the lines of Dr. Bronner's Pure Castile Soap.
To make your own supply of the Cornell formula, mix one tablespoon each of baking soda, oil and castile soap together in one gallon of water.
Shake mixture well and use as a spray. To keep baking soda agitated within the spray solution, some people add a golf ball inside the spray apparatus.
