Organic Plant Fungicide

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Ingredients
one gallon of water

1 tablespoon baking soda (Note:  Some resources recommend using potassium bicarbonate as a substitute for baking soda.)
1 tablespoon vegetable cooking oil  (Helps mixture cling to leaves and stems.)
1/2 tsp dishwashing liquid  (Helps mixture cling to leaves and stems.  DO NOT use anti-bacterial types. )  
Directions
  • Shake well and then spray on the plant you wish to protect and/or rescue.
  • If your plants are already diseased, make sure to remove all leaves and stems that are affected.  Also remove any mulch or dead leaves underneath the plant - don't compost them - put them in the trash.
  • Very important:  spray the undersides of the leaves, as well as the top.  The underside is where disease can begin.  
  • Don't spray in direct sun in the heat of the day; spray in the morning or late evening.  

This was developed at Cornell University and is excellent at preventing and fighting fungicide disease in plants.