Question: how do you treat fungal infection in plants?
Answer: Milk is known as an effective treatment for powdery mildew. ... 
Sulfur in dust form can keep disease at bay. ... 
The “Cornell Formula” is a well known natural fungicide, which includes mixing 1 tablespoon baking soda, 1 tablespoon horticultural oil and 1 to 2 drops dishwashing liquid.