aspirin for your plants - Aspirin is the remedy for fungal plant problems, Black spot, powdery mildew, and rust are a terrible trio of fungi, which can attack and destroy your plants. Scientists have found that two uncoated aspirin tablets (325 milligrams each) dissolved in 1 quart of water and used as a foliar spray can thwart these diseases... 35 Pest, Disease and Weed Remedies--green and safe
Black spots on the leaves of your rose bushes, followed by yellow leaves and then bony stems and no leaves? Pull off leaves with black spot. Mix 1/4 cup of skim milk in a gallon of water in your watering can and rinse over the rose bushes, the rose bush will sprout many new growth stalks since it responds to milk just like a good fertilizer. I would repeat this rinse every 4 weeks.
Mother Nature's Best Fertilizers and Bug Repellents