Treat rust and other plant diseases

You can use vinegar to treat a host of plant diseases, including rust, black spot, and powdery mildew. Mix 2 tablespoons apple cider vinegar in 2 quarts (2 liters) water, and pour some into a recycled spray bottle. Spray the solution on your affected plants in the morning or early evening (when temperatures are relatively cool and there’s no direct light on the plant) until the condition is cured.