Aspirin is a remedy for fungal plant problems (black spot, powdery mildew, and rust are a terrible trio of fungi). Dissolve two uncoated aspirin tablets milligrams each) in 1 quart of water and use as a foliar spray to thwart these diseases.
Diseases of Plant Leaves. This picture describes the graphical detail of plant leave disease. White Flies Aphids Spots Grey Mould Powdery Mildew Leaf Fall Leaf Bronzing Rust Mealy Bug Yellowing of Leaves garden-organic-self-sustain