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A tonic for black spot and powdery mildew on roses Roses, while beautiful, are often plagued with black spot or powdery mildew. I mix these ingredients into a tonic, which I spray on my roses: 2 teaspoons of baking soda and 1/2 teaspoon of liquid soap or Murphy's oil soap in 2 quarts of water. The tonic protects the roses for months.
"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."
To protect plants in the cabbage family from having their leaves eaten: Mix 2 tablespoons of red-pepper powder and 6 drops of liquid soap in 1 gallon of water. Let the mixture sit overnight, and stir thoroughly. Pour the mixture into a spray bottle, shake well, and spray weekly on the tops and bottoms of the leaves.
GENERAL PRECAUTIONS In all parts of the garden, pests and diseases can play havoc with the crops, whether flower, fruit or vegetable. These insect pests are divided into three classes according to the type of destruction they do and the necessary control. Those that live in the soil can only be destroyed by the use of a soil fumigant o