Pour 8 ounces of 3-percent hydrogen peroxide in 1 gallon of water, and add 8 ounces blackstrap molasses or white sugar. Stir the solution and pour it into a spray bottle. Then, spray the plant with the mixture, fully soaking the surface underneath the leaves, the soil and the crown of the plant. Alternatively, use undiluted 3-percent hydrogen peroxide, although you might find that the molasses or sugar helps the mixture stick to the plant better. Spray the plant daily for one week.